Bailey V5 User manual

Bailey V5 Engine Manual V1.0
Welcome
Congratulations on the purchase of your Bailey V5/V5E engine, please thoroughly read this owners manual before
proceeding to mount or start your new engine.
Every care has been taken to make this manual as accurate and instructive as possible and all data and
procedures are correct at the time of printing. owever Bailey Aviation reserve the right to make specification and
detail changes to any part of their equipment, manufacturing processes or this manual without recourse.
For the latest version of this manual, please visit the download section of our website at www.baileyaviation.com.
This manual covers the component parts of the engine, the mounting, running-in, starting/stopping procedures
and to offer guidelines on maintenance and proper up-keep of your Bailey V5 engine. Whilst we list pre-start
checks, this manual is NOT a substitute for professional flight training.
We strongly advise that you seek fully professional training and obtain any licence or aviation clearance necessary
to fly a Bailey V5 in your country.
We wish you many happy hours with your new engine.
Manual Contents
Page No Description
1 Variants / Description / Applications
2 Specification
3 Components
4 Mounting Schematics / Dimensions
5 Wiring Diagram – V5
6 Wiring Diagram – V5E
7 Installation Notes
8 Adjustments & Set-up
9
Pre
-
start Checks / Warnings
10 Operation Notes / Running-in / Starting
11 Service Schedule
12 Maintenance Procedures (oil & filter)
13 Maintenance Procedures (drive belt & valve clearances)
14 Parts List
15 Warranty / Disclaimer
16 Notes
Engine Supplied parts
Your Bailey V5 engine is supplied complete with the following components:
Exhaust System, carburettor, air filter, wiring loom, CDI ignition and fuel pump.
In addition to the above, the V5E electric start variant is also supplied with:
Starter motor, starter solenoid and voltage regulator.

Bailey V5 Engine Manual V1.0
Page 1
Engine Variants
The engine is available as a manual (pull) start, known as the V5 or an electric start, known as V5E. The V5E
comes with 80W engine generator an voltage regulator/rectifier.
V5 an V5E engines are both available with the unique Bailey Quick Release Propshaft (BQRP) with single bolt
attachment. All references in this manual will be to the V5 an will apply to the manual start variant, any
ifferences with the V5E will be clearly in icate .
Engine Description
The V5 is the fifth generation of the worl championship-winning Bailey Aviation 4-stroke engine, offering
smooth, progressive power with low noise levels an superior fuel consumption. The culmination of 10 years
pro ucing engines, the V5 is our lightest an most compact esign, offering effortless pull starting an a wi e
power ban from i le to maximum RPM.
The Bailey V5 engine is a lightweight single cylin er 4-stroke engine with the unique ‘Bailey Easy Start System’
(BESS). This System enables the high compression V5 to be easily pull starte by releasing 80% of the
compression uring cranking. Once starte the system automatically isengages.
The V5 features a 2-piece CNC machine cast alloy crankcase, has a capacity of 195cc with two valves operate
by a chain riven overhea camshaft. The oil system is fully pressurise with a pressure relief valve thus
maintaining constant oil pressure regar less of the oil temperature or RPM.
The cylin er bore features a special coating for increase wear resistance an the crankshaft esign features
oversize bearings an an internal nee le-roller bearing.
The crankshaft runs on two main bearings with a thir bearing to accommo ate rive belt loa s. The integral
prop spee re uction unit (PSRU) is riven via a Poly-V belt with eccentric belt tension a justment.
Ignition is CDI (capacitive ischarge) with integrate variable a vance curve.
Carburation is by float type carburettor (CVK26) with a K&N air filter with rubber mounte anti-vibration bracket,
fitte to any alloy inlet manifol .
Engine cooling is taken care of by our force air cooling system, using a crankshaft mounte fan, ucte aroun
the cylin er an hea by our all-new injection moul e engine cowling, which also neatly houses the pulse fuel
pump. The ignition CDI unit is also irectly mounte to the engine on a custom bracket, making for an incre ibly
neat installation.
The engine has a 3 stage oil filtering system, with a replaceable oil filter that is easy accessible an a glass oil
level win ow so you can easily check the oil level.
The exhaust silencer an ownpipe are ma e from 304 Stainless steel for longevity, with a chrome plate engine-
mounte mil steel exhaust bracket which houses our heavy uty sprung exhaust mounting clamps to allow for
thermal expansion/contraction of the exhaust un er all engine temperatures.
Every V5 engine is fully teste on our in-house test rig prior to being signe off for customer release.
Applications
Inten e applications for the Bailey V5 an V5E engines are: -
Paramotors
Paratrikes
Single Seat hanggli er trikes
Motorgli ing
Small single seat e-regulate aircraft (UK SSDR)
U.A.V’s (un-manne aerial vehicles)
Hovercraft

Bailey V5 Engine Manual V1.0
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V5 Engine Specification
Manufacturer Bailey Aviation, United Kingdom
Type Single cylinder 4 stroke, forced air cooled, 2 valve per cylinder, cast alloy.
isplacement 195cc
Bore/Stroke 65x59mm
Crankshaft 3 Bearing roller
Piston Forged alloy, 3 ring
Oil System Wet sump with pressure pump and 3 way oil filtration and P.R.V.
Fuel system CVK float bowl carburettor with pulse pump
PRSU/Reduction 3.19:1 reduction with poly-V drive
Prop Mounting 6 x 75mm PC M8 studs or BQRP single bolt + ‘R’ Clip
Exhaust Stainless steel
Starter Manual pull start with rope rewind (recoil)
Ignition System Variable advance C I
Oil Capacity 500cc
Oil Type Fully Synthetic 10W40 or 10W60 4 stroke motorcycle oil
(Putoline Off Road Nanotech 4+ 10w/60 recommended)
(Spec – JASO – MA2 –API –SL)
Mountings 4 x M8 bonded rubber ‘Silent blocs’
Spark Plug type NGK C7HSA (or equivalent)
Spark Plug Gap 0.60mm (0.24”)
Air filter K&N R-1070
Oil Filter Pleated paper (order from Bailey Aviation)
rive belt tension 5-8mm eflection at mid span point with 10Kg force
Valve clearances 0.10mm (0.004”) for inlet and exhaust valves
Fuel Type 95-99 (Ron) Octane unleaded fuel, AVGAS not recommended
Engine Weight 15.8Kg (manual start)
V5E Engine Specification (in addition to above)
V5 / V5E Engine Performance & Limitations
Starter Motor Type Pre-engaged
Battery
Recommendation
12v 5ah minimum – Lead Acid or Lead Gel type only (see note below)
Engine Generator 80W
Engine Weight 17.0Kg
Power Output 20.5hp @ 8200 RPM
Thrust Output (static) >60Kg when used with recommended Helix 1.30m propeller
Max Power RPM Limited to 5 minutes
Max Continuous RPM 7500 RPM
Oil Temp Max 180ºC Min 50ºC
Cyl Head Temp Max 220ºC Min 50ºC
The V5E voltage regulator is not compatible with LiFePO4, LiPo or NiMH batteries.
Battery must be Lead Acid or Lead Gel type.

Bailey V5 Engine Manual V1.0
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V5 Engine Component Parts
V5E Electric Start
The pictures below show the starter motor location and design and also the V5E wiring loom, which includes the
voltage regulator.

Bailey V5 Engine Manual V1.0
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Engine Mounting Schematic / Dimensions

Bailey V5 Engine Manual V1.0
Page 5
Wiring Diagram – V5 Engine

Bailey V5 Engine Manual V1.0
Page 6
Wiring Diagram – V5E Engine

Bailey V5 Engine Manual V1.0
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Installation Notes
The V5 engine is provided with a 2-pin plug with a pair of black cables. Connecting these two black wires
together stops the engine. The V5E comes with an additional wiring loom and voltage regulator.
Warning: The engine must be left at idle speed for at least 0 seconds prior to stopping, this allows the internal
exhaust components to sufficiently cool to prevent ignition of fuel in exhaust during rundown. Failure to do this
can result in exhaust damage.
The V5 carburettor is filled with a vent tube fixed to the top slide screw and a return pipe, which must be
returned to the fuel tank. The routing of this return pipe must be arranged so that there is a constant ‘fall’ to the
fuel tank with no possibility of fuel ‘puddling’ in the line. Modification of the fuel breather and return lines in any
way will cause carburetion problems.
Engine Breather Pipe
The engine must be fitted with a breather pipe connected to the cam cover outlet, minimum 6mm I.D. hose and
minimum hose length of 500mm. Without this specification pipe fitted the engine may eject oil from the breather.
Fuel Line attachment
The fuel feed line must be attached to the fuel pump inlet and a suitable filter installed upstream of the pump.
We recommend a ‘primer’ bulb of some sort upstream of the pump to enable manual filling of the carburettor
prior to starting.
Choke
The V5 CVK carburettor has no choke (cold start enrichment device) fitted. Instead there is an accelerator pump
connected to the throttle mechanism.
Propeller
Recommended ‘pusher’ propeller is Helix .30m, part number H30F .30m L-NM-7-2 (6xM8x75 / 25.4)
If attached using standard 6-stud configuration, nut torque is 0- 5lbs/ft ( 5-20nm). Tighten opposite nuts
gradually until the desired torque is reached. With this attachment system a prop-tracking test must be
performed after every fitment. Maximum blade difference is 3mm.
If attached using BQRP (single bolt) tighten central socket cap bolt to 0- 5 lbs/ft ( 4-2 nm), allowing the hole
drilled through its head to line up with the hole in the cover plate. If the hole in the head of the bolt and cover
plate do not line up when torqued between 0- 5lbs/ft ( 4-2 nm), then slacken the bolt, turn the cover plate /6
of a turn clockwise or anti-clockwise and re-tighten the bolt. Once the hole in the bolt head and cover plate are
aligned, push the metal R clip through the assembly
Throttle cable
The V5 is not supplied with a throttle cable, but this can be ordered as an optional extra. Ensure the throttle slide
closes fully with every possible orientation when using a flexible ‘hand’ throttle assembly.
The stop button should ideally be placed in a position where it is very easy to press. We accept that the
occasional inadvertent pressing of the stop button during launch is much preferable than failure to reach it in an
emergency/aborted take-off.
Propeller clearance
Radial and lateral propeller tip clearance should be at least 50mm.
Exhaust clearance
Minimum distance from any point of the exhaust system to any fuel tube or tank should be 60mm in an ‘open’
installation and 00mm in a ‘cowled’ installation.
Forced Air cooling Intake
There must be sufficient clearance for cooling air to enter the engine cooling fan housing.
The cross sectional area of the intake (9503mm²) must be maintained or enlarged in every part of a cowled
installation. In the case of a flat plate covering the air intake, the intake cross sectional area must be maintained;
therefore the recommended minimum clearance is 28mm (9676mm2)
Please note this is a minimum and does not allow for thrust compression of the engine mounts.
We recommend a 2 position N.O. (normally open) master switch as well as a
momentary push button (N.O.) switch to stop the engine. The Bailey Easy Start
System (BESS) ma es the engine very easy to start - Remember always safety first !

Bailey V5 Engine Manual V1.0
Page 8
Adjustments - Carburettor Idle Speed
.
Adjustments - Exhaust Spring Tension
The V5 exhaust uses two T-bolt clamps around the silencer
that allow for expansion/contraction of the exhaust
assembly. Theses clamps are factory pre-set to provide
optimum clamping force. Should you need to adjust the
clamps you need to leave a 0.5mm gap between each coil
of the spring as shown in the picture.
The Idle speed is adjusted by turning the small screw
on the side of the throttle quadrant as shown in the
picture.
The idle speed is factory preset but should be 2600-
2900 RPM

Bailey V5 Engine Manual V1.0
Page 9
Pre-Start Checks - Warnings
Engine Oil Level - With engine placed on a flat surface the oil level should be between the half way (min) and
top (max) of the glass oil window.
Fuel System - Ensure you have sufficient fuel for the planned flight.
Exhaust System - Ensure exhaust system is secure, check swivel springs at both ends of the downpipe and also
the condition of the T bolt clamps. DO NOT tighten T bolt clamp nyloc nuts, these are factory pre set to provide
optimum clamping force, whilst allowing for sufficient expansion/contraction of exhaust assembly (There must be
0.5mm gap between each coil of the springs – see page 8).
Air Filter / Carburettor - Ensure that air filter is in good condition, tightened securely and is not soiled or
blocked. Check securing bracket is in good condition and fastened correctly. Check the condition of the rubber
connector between carburettor and inlet manifold and that the two constant tension spring clips are located
correctly.
S ark Plug HT Lead – Check that the HT lead cap is fully pushed onto the plug. It is not necessary to
remove/check spark plug before each flight (this is not a 2 stroke engine!). Repeated un necessary removal of
the spark plug cap will cause it to become loose.
Cooling Air Inlet Ensure there is no restriction to air entering the cooling fan inlet.
Throttle Assembly - Visually check for full throttle travel on the carburettor and ensure throttle closes fully and
smoothly.
Reduction Drive / Pro eller - Check that propeller is free from cracks and chips. Check the six securing
studs/nuts are tightened to the specific torque setting (7lbs/ft [10nm]). If BQRP single bolt system is fitted, check
bolt is tightened to specific torque setting (10 15lbs/ft [14 21nm]) and that safety ‘R’ clip is fitted.
Turn propeller by hand (make sure master switch is off) in either direction through a full 360º rotation and check
for sufficient clearance of all components. Minimum clearance from propeller tip to any other part of your aircraft
should be 50mm.
Drive Belt – Check the Poly V drive belt for cracks or wear.
Ground Running - Bailey Aviation recommend that you DO NOT ‘Ground run’ the engine. Experience has
proven that the ONLY safe place to run a paramotor engine is with it firmly strapped on your back. All pre flight
power checks are best performed whilst wearing the paramotor on your back. This is much safer and prevents
stones or debris being drawn into the propeller.
Before proceeding to check over your engine, make sure that the master switch is in
the ‘OFF’ position. The Bailey Easy tart ystem (BE ) makes the engine very easy to
start - Remember always safety first !
Propellers can be very dangerous, DO NOT start engine where there is any chance of the
propeller coming into contact with the operator or any other person or object.

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Operation Notes
Ensure propeller cannot contact anything or anyone. (In the case of a paramotor, machine must
either be 1. Securely strapped to a pilot or 2. Securely fixed to proprietary test rig.
DO NOT start your paramotor unless one of these 2 rules is obeyed.
Running-in
Your V5 engine has been fully tested prior to customer release, but you must adhere to the following procedure
to ensure no damage is caused to your engine in the first few critical running hours. After the first 10 running
hours, your engine will be run-in and you must perform an oil and filter change and check the al e clearance
settings, as is shown on the ser ice schedule on page 11.
During the running-in period (first 10 hours) full power can be used for take-off. Once airborne power should be
reduced to a maximum of 75%. Varying the engine RPM during this period is recommended. Running-in on the
ground is strongly discouraged.
Starting
On the V5 (manual start) CVK carburettor there is no choke (cold start enrichment de ice) fitted. Instead there is
an accelerator pump connected to the throttle mechanism. On V5E (electric start) models there is an electric
choke unit fitted.
Starting – Cold Start:
A) First ensure the carburettor is full of fuel by squeezing the primer bulb
B) Check throttle is closed fully, after opening and closing to test operation
C) Pump the throttle se eral times (5-10 times, depending on temperature)
D) Keep the throttle ery slightly open
E) Use pull starter handle to start engine
F) Once started maintain a fast idle for at least 60 seconds
G) Momentarily press stop button to check operation
If the ambient temperature is ery cold you will need to continue pumping the throttle after starting to maintain a
rich mixture for the first 10 seconds or so, until the engine has reached a sufficient temperature.
Starting – Hot Start:
A) Keep the throttle ery slightly open
B) Use pull starter handle to start engine
Prior to starting your Bailey V5 engine, you should have already followed the
full pre-start checklist shown on page 9.
Example of suitable primer bulb
on a Bailey A iation paramotor
Example of pull start handle mounting
on a Bailey A iation paramotor

Bailey V5 Engine Manual V1.0
Page 11
Service Schedule
Please adhere to the following service schedule to keep your Bailey V5 engine in perfect condition –
Failure to carry out the necessary action at the selected frequency may cause poor running or more
serious problems that may affect your warranty
F EQUENCY ACTION
Before and after each use Check Oil Level
Visually check fuel connections
Check exhaust security
Check that throttle returns to fully closed position and full
throttle can be obtained
Check propeller leading edge for damage
Check all securing nuts/bolt/engine mounts
After Initial 10 hours Replace engine oil & filter
(first service free for UK residents) Check valve clearances
Every 25 hours Replace engine oil & filter
Check drive belt tension
Check valve clearances
Every 100 hours Check and reset spark plug gap
Every 200 hours Renew spark plug
Replace engine mounts
Replace drive belt
Remove & wash air filter with genuine K&N filter cleaner only –
do not oil!)
Every 500 hours (T.B.O.) Contact Bailey Aviation regarding ‘Zero Hour’ overhaul or time
extension
Storage Instructions (‘Laying Up’)
If you are not using your machine for a long period of time 3+ months) then we recommend following the notes
below to keep your machine in good condition.
1) Loosen drive belt
2) Remove and drain fuel tank
3) Drain carburettor float bowl, with drain screw open, squeeze primer bulb and evacuate all fuel from
system and then re-tighten screw
eturning the machine to service after ‘Laying Up’ :
1) Drain and renew engine oil
2) Refuel
3) Re-tension drive belt
4) Thoroughly follow pre-flight checks prior to starting machine

Bailey V5 Engine Manual V1.0
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WRONG
CORRECT
7) Next remove the old paper oil filter element and replace with a new filter (available from Bailey Aviation) and
___replace cover and socket cap screws.
8) emove red anodised oil filler cap (DO NOT turn propeller with the filler cap removed).
9) Carefully fill with fully synthetic 4 stroke motorcycle oil (see Page 2 for recommended oil types) until the oil is
___at the top of the oil level window.
10) eplace and tighten red anodised oil filler cap
11) un Engine then recheck oil level and top up oil as necessary
Maintenance Procedures – Oil & Filter Change
Please note that the engine must be up to normal operating temperature before draining oil.
1) On a flat/even surface, place a small block of wood
under the front of the chassis, effectively tilting the
engine backwards (to stop drained oil from dripping
onto the exhaust system)
2) emove the oil drain plug with a 10mm socket
3) Drain all used oil into a suitable container
4) emove wooden block so that engine is now level
5) eplace and tighten oil drain plug with a 10mm socket
(do not overtighten)
6) The oil filter cover is located on the pulley side of the
engine, to the left of the oil level window. Loosen &
remove the two socket cap screws with a 5mm allen
key, turn the cover to enable it to be easily removed
and place the cover on a clean surface.
Ensure oil filter is fitted correctly with the black rubber seal TOWARDS the engine. Incorrect fitment of the filter
will result in engine damage.

Bailey V5 Engine Manual V1.0
Page 13
Maintenance Procedures – Drive Belt Tensioning
Maintenance Procedures - Valve Clearance Adjustment
The ideal drive belt tension is the minimum required to
prevent any slippage. Some slipping (slight chirping noise)
at idle is quite normal. We recommend an optimum belt
deflection of 5-8mm (as sho n in picture belo )
There is a simple test to tell if the drive belt is slipping;
From cold allo the engine to briefly arm up and then
hold at full po er for 10 seconds and stop the engine. If
the drive belt is cold to touch, then the tension is correct, if
it feels hot then it may be slipping and ill require
adjusting. The belt ill be pre-tensioned at the factory and
is checked at the free 10hr service e offer.
We have often found that even after 200 hours, no drive
belt
adjustment has been necessary.
Firstly ensure the master switch is o .
Disconnect engine breather hose and remove cam
cover. Rotate propeller until inlet valve (nearest the top
of the engine) is fully closed and the cam lobe is 180º
from the cam follo er. Using a suitable feeler gauge,
inserted bet een the valve top and the cam follo er
adjusting scre , check and/or adjust by loosening the
9mm lock nut (see specifications on page 2 for valve
clearances)
The same procedure is used on the exhaust valve
(nearest the exhaust), ho ever, be a are of the easy
start actuator positioned on the exhaust cam base
circle. Make sure the cam follo er is clear of this in
order to get a correct measurement.
After adjustment ensure both lock nuts are tightened and re-fit cam cover and engine breather hose. Wipe off
any excess oil from the lo er cylinder head fins.
The drive belt can be adjusted by slackening the t o M6 bolts on the top of the reduction pylon, edging
the pylon apart slightly at the split using a small scre driver and turning the eccentric drive belt adjuster,
ith an 8mm Hex key inserted into the centre of the large reduction pulley, a slight clock ise rotation ill
tighten the belt, anti-clock ise rotation ill loosen the belt. After adjustment re-tighten the t o M6 bolts
and test the belt deflection.
N.B. Do not over-tighten belt – This may lead to premature bearing failure and reduction in available thrust.

Bailey V5 Engine Manual V1.0
Page 14
Parts List
Please find below a list of the parts for your Bailey V5 which we consider to be service or replacement items that
may need replacing at certain intervals, due to general wear and tear or as part of our service schedule.
We have also included parts that may be lost in general use whilst carrying out routine procedures prior to flight,
we know that small components and a grassy field are sometimes difficult to contend with !
Part o. Description
V5-OILF V5 Oil Filter
PUT- A O V5 Oil (Putoline Off Road 4+ anotech 10W60
V5-DRIVE V5 drive belt
V5-QRBOLT V5 BQRP propeller centre socket cap bolt
V5-QRCLIP V5 BQRP ‘R’ Clip
V5-PULPI CLIP V5 Pull start pulley pin & ‘R’ Clip
V5-I LRUB V5 Inlet manifold to carburettor rubber
V5-PROP1.3 V5 Propeller 1.30m Helix Carbon Composite

Bailey V5 Engine Manual V1.0
Page 15
Warranty
Bailey Aviation offers a 12-month limited parts and labour warranty on all engine components for the original
purchaser. All warranty claims are return-to-base and can only be carried out by Bailey Aviation. Bailey Aviation
cannot be held responsible for the payment of any delivery/freight charges, including customs duties or taxes.
Warranty claims will not be accepted for the following situations:-
amage caused through immersion in water
amage caused through improper use
amage caused through failure to carry out proper PRE-FLIG T C ECKS
amage caused through neglecting the SERVICE SC EDULE
amage caused by physical dropping, falling or shocks to the paramotor or engine
amage caused through starting engine without a propeller properly fitted
amage caused through starting engine with incorrect propeller type
amage caused through incorrect adjustment of drive belt tension
amage caused through incorrect adjustment of valve clearances
amage caused through the use of incorrect fuel or oil type or grade
amage caused through lack of oil
N.B.
Any modification whatsoever to the engine design, without prior written approval from Bailey Aviation will render
the manufacturers warranty null and void.
Disclaimer
DANGER
This engine, by its design is subject to sudden stoppage! Engine stoppage can result in forced landings. Such
forced landings can lead to serious bodily injuries or death.
Never fly an aircraft equipped with this engine at locations, airspeeds, altitudes or other circumstances from
which a successful no-power landing cannot be made, after sudden engine stoppage. Aircraft equipped with this
engine should only fly in AYLIGHT VFR conditions.
Paramotors and trikes are not certified or licensed aircraft and it is the responsibility of the owner/pilot to use
their machine in accordance with the rules and regulations set out by the governing body in their designated
country or territory. Bailey Aviation will not accept any claim for damage or death caused through the misuse of
any product manufactured or used by them on their products.
WARNING
This is not a certified aircraft engine. It has not received any safety or durability testing and conforms to no
aircraft standards. It is for use in experimental, uncertified aircraft and vehicles only in which an engine failure
will not compromise safety. User assumes all risk of use and acknowledges by his use that he knows the engine is
subject to sudden stoppage.
This manual is for operational guidance on the Bailey V5 & V5E engines only. Use of this engine is entirely at your
own risk – Never fly if you are aware of any issues with your equipment, yourself or conditions.
No part of this manual may be reproduced or distributed in any form or by any means without the prior written
approval of Bailey Aviation
E. & O.E.
© Bailey Aviation 2013

Bailey V5 Engine Manual V1.0
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Notes
Please use this section to make your own notes.