RCMAX 55 SUPREME Owner's manual

RCMAX 55/65 SUPREME Installation and Operation
Congratulations, and thank you for purchasing your new RCMAX engine.
This is a high performance, two stroke engine which produces over five times the power of a standard
largescale, RC car/buggy engine. Please be prepared for the transformation of your RC!!
Drive with care while you are getting used to this.
We strongly recommend fitting a remote kill switch to your engine, as should be the practice with all
largescale cars. Most normal 1/5 scale kill switches, plug straight in place of the stock button provided.
Important Safety Note:
Because of the performance potential of this engine in a vehicle, such as the HPI Baja, it is
necessary to operate the vehicle in a suitable, controlled environment. It should not be operated
in a public space where people are engaged in other activities, such as a public park. Do not operate
in an area where there are children playing, near pets or other animals. Do not operate on a public.
highway.
Loss of control of such a vehicle could result in serious injury to another person, family pet or other
animal.
Be aware that the engine silencing is minimal so do not run the engine in an area where this could
cause a nuisance. You and those around you should always use ear protection during operation.
Please note: All of the manufacturers safety instructions for the operation of the vehicle in which the
engine is fitted, must be followed.
Fuel Safety Guidelines
Fuel is highly flammable. Never operate the vehicle near open flames. Do not smoke while
handling fuel. Always operate the vehicle in a well ventilated area. Model car engines produce
carbon monoxide fumes.

Installation in Losi 5ive-T
Installation in the Losi is pretty much the same as a standard engine with the exception of the
expansion chamber. This is supplied with a bracket to attach to the pull start housing 2x bolts. It is
connected to the engine using an "O" ring sealed joint and a retaining spring. The 'O' rings are supplied.
Just push the pipe over the exhaust stub, attach the springs, and bolt to the bracket wiith rubber mount.
Throttle/Carb/Intake
A Walbro WJ71 big bore carb is fitted as standard on the RCMAX 55/65. This carb has had the stock
throttle shaft drilled and a quick release fitting can be fitted here so that you can simply hook it up to your cars
servo arm and adjust to suit.
An intake system is provided with your engine package which brings the air filter in line with the vents
in the body so that clean fresh air is being used for optimal performance.
NOTE: See further sheet for more information on the carb and settings
Gearing
A higher ratio is required for the main drive gears. A 28 tooth pinion and 50 tooth spur gear should provide
a good starting point. Suitable gears for the Losi are made by
Blackbone Racing
and available from us
.
This ratio should give the car rapid acceleration and a reasonable top speed so it can be used in a
reasonably sized space. Lots of other gear combinations are available, please just ask we carry stock of
all the popular sizes.
Drivetrain
Because of the considerable extra performance of the engine it will be necessary to upgrade the drivetrain
with heavy duty parts. We would recommend using heavy duty drive shafts, heavy duty billet diff housings as
per the
RCMAX DIFFS
with oversize bearings and Billet diff casings such as the
RCMAX 7075 Diff Cup.
If your looking to prep your car as best as possible, we have created a Billet Losi Chassis (1.0/2.0) that
prevents excess flex which can kill your centre driveline (see pics below)
We also advise to use 1M weight oil or a locker in the centre, 500k in the rear and 300k oil in the
front diff. In this way you will always have at least two wheels driving and a good spread of the power.
Note: See supplementary sheet for installation in the HPI BAJA

Installation in a HPI BAJA
Installation in the vehicle is straightforward. The engine is designed to make use of most of the existing mounting points
with the exception of the left side of the chassis. Here two brackets are supplied as part of the engine package, which
replace the original parts.
Some adjustment will be required to your throttle linkage to connect to the carburettor due to the size and spacing.
The RCMAX exhaust mounts to the engine with a sealed joint and to the chassis via the supplied brackets
and rubber support mounts. Thus it is quick and easy to release if you need access to your radio gear, etc.
It is recommended that you fit a
Team Chase
roll cage to your vehicle to protect the engine and expansion
chamber in the event of a roll.
Left side front mount
Left side rear mount
Right side mounting bolts (2 behind pinion)
Note
: Three M5 bolts fitted from below
the chassis, not shown in the photo's
Note
: See supplementary sheet for installation in the Losi 5ive-T
Due to the considerable increase in power over the standard engine it is advisable to replace the standard
drivetrain parts, such as gears and drive shafts, with heavy duty, upgrade parts. We would recommend
using a billet aluminium alloy diff case with steel gears throughout. Blackbone Racing now make a full set
of replacement, heavy duty gears for the Baja gearbox.
Primary drive gears should only be from Blackbone Racing, which we stock a full range of sizes. We would
recommend using 26/48 or 27/47 gears with your 65cc engine depending on taste.
Drive shafts should be heavy duty types. We would also recommend that you fit a locked or limited slip differential.
To make control of the vehicle easier it would be advisable to fit some sort of wheelie bar on the
rear of the chassis. This, together with heavy oil in the diff (250-2M), helps to make the vehicle more driveable
on the throttle. The ideal solution is the RCMAX HEX-LOCK KIT to forget diff failures for good!
Finally a good set of wheels, preferably BRP wheels will be required to prevent constant foam blow outs!

Installation in Kraken Vekta
Installation in the Vekta is pretty much the same as a standard engine with the exception of the
expansion chamber. This is supplied with new brackets to attach to the car securely. It is
connected to the engine using a gasket and header piece, then the main pipe attaches via a slip joint
and retaining springs. A small length of tubing is supplied to fit to the end of the outlet and ensure no oil
residue from the smoke is left inside the car.
Minor Cage Modification (not body panels)
As shown on the picture below, there is a small mod required to the plastic cage bars which are in the
way of the rcmax billet intake. Simply trim this cross bar and circle section from the cage, leaving the body
panel in tact. This just allows a little room in the event of a rollover for the body to flex inwards without hitting.
Also with the new SUPREME Cylinder head, it is required to remove the front right cage bar which hits the head.
Throttle/Carb/Intake
A Rooster 990 Full Mod is fitted as standard on the RCMAX 55/65 with the option of a WJ71 also when ordering.
Both carbs are supplied with throttle arms prepared to take the supplied quick release fitting, we also
supply a new link rod which is bent to fit the large crankcase.
If your using the WJ71 Carb, youll notice its 10mm wider and therefore more effort needed on the cage, we
supply a billet spacer which fits between your cage and the bottom cage mount leg to space out the cage.
NOTE: See further sheet for more information on the carb and settings
Gearing
A higher ratio is required for the main drive gears. A 22 tooth pinion and 19 tooth step gear should provide
a good starting point. Suitable gears for the Vekta are made by Vertigo and we offer their system.
This ratio should give the car good acceleration and a reasonable top speed so it can be used in a
reasonably sized space. Lots of other gear combinations are available too.
Please bare in mind tyre size, if you run Trepadors then stage 2 gears (21/20) will be plenty.
Drivetrain
Because of the considerable extra performance of the engine it will be necessary to upgrade the drivetrain
Because of the considerable extra performance of the engine it will be necessary to upgrade the drivetrain
with heavy duty parts. We would recommend using the RCMAX heavy duty front billet diff housing.
We also advise to use 1M diff oil in the rear and 300k oil in the front diff. In this way you will always have
a good spread of the power and the engine should not be able to overcome the oil too easily.

Engine Starting Procedure
NOTE:
Your Air Filter requires oiling before use -
We are
cautious with the fumes from the oil causing issues during shipment
.
Decompression valve (optional)
Engine stop switch Pull starter
Choke lever - automatically releases when throttle is opened
First Time Engine Starting.
When starting for the first time following engine installation it will be necessary to draw the
fuel from the tank up to the carburettor. Push the choke lever down into the 'ON' position.
Press the decompressor valve down (if fitted) and pull the starter cord about 3-4 times a little slower
than for engine starting. If you have a clear fuel tube you will see the fuel being drawn into the
carburettor. Once this procedure is complete you can start the engine.
Engine Starting.
With the choke on, first engage the starter carefully and then pull the starter cord fully and strongly
to start the engine.
Please note that it is necessary to reset the decompressor valve after
each pull of the starter (if fitted).
After two to three pulls of the starter the engine should fire once.
At this point release the choke lever, press the decompressor and pull the starter cord to start the engine.
Two or three
STRONG, HARD
pulls should be sufficient. DO NOT SNATCH at the starter, engage first
and then pull through with a strong meaningful stroke.
Engine Break-In.
After starting the engine make sure it is fully up to operating temperature before driving the vehicle.
For initial break in during the first 5mins, allow the engine to idle with intermittant blips of the throttle.
Then operate the vehicle using short bursts of heavy throttle to allow the engine and clutch shoes to
fully bed in, while keeping the car moving at good speeds for air flow. DO NOT fall into the trap of
driving around slowly on half throttle. This is the fastest way to overheat your engine and clutch.
Safety Note:
Because of space limitations within the vehicle, the silencing of the exhaust
system is limited. Always wear ear protection when running the engine.