Moki 100 BVT User manual

MOKI 100 BVT Operating Instructions
Capacity 100 cc
Power 7 bhp
Weight 2,9 kg
Propeller 2 Blade Menz S:
26x 8/ 26x10/
3 Blade Menz S:
26x 8
Oil Mix 1 part Moto-X Sythetic to 50 parts
unleaded normal petrol
Moki 100 BVT is a 4 stroke petrol motor with an incomparable power to size and
weight ratio. The motor has been developed to produce maximum power at relatively
low rpm with high torque characteristics. It includes a state-of-the-art computerised
electronic ignition system and runs on environmentally friendly unleaded petrol.
The mixture is delivered by a pumped carburettor to the crankcase of the motor, and
then from here via an induction tube to the cylinders. This method gives an excellent
lubrication of all moving parts. The pressure pulse to drive the carb pump is made by
an integrated pump in the front of the crankcase, connected to the carb by an
external silicone tube.
The ignition system should be mounted separate from the motor in a convenient
place and shock protected. The ignition pack controls the firing sequence, the
advance curve as well as an ignition cut-off, to stop the motor overspeeding and
creating noise problems. Furthermore, data is recorded to act as a service
record, such as the motor number, hours of operation and revs used.
Setting up:
Each motor is run for a short period at the factory, valve and carb settings are
checked. A test report of findings is included with each engine.
he valve clearance is set at 0.05-0.08mm, (5-8 thou) using feeler gauges, set with
both valves closed between rocker pad and pushrod. Ensure the valves are closed
by turning prop ( ingnition off ) until the cylinder has reached Top Dead Centre (TDC)
and both valves are fully shut. Please take care that correct valve clearance is
maintained at all times, because burning and overheating of the valves seats will
occur if the engine is run with valves that cannot fully close.
The valve gear is laid-out so that when the motor is warm, the valve clearance will
increase, therefore check clearances cold. Take care not to put any side load on the
pushrods during handling as they will bend and cannot be straightened.
Lubricate valve gear with light machine oil before each days flying.

Before initial running, check that the prop bolts are of the correct length for your
propeller, tightened equally and securely, Your tank should be of 26-40 oz capacity
and be fitted with a filter and 1/8 " / 2,5 mm bore petrol resistant fuel line, these items
are available from us.
The ignition battery pack should be 4,8 Volt nicad pack of at least 1.400-1.800 maH
capacity, connect via a two pole On/Off switch, or alternatively via an R/C switch unit
available from us, to the two pole socket on the ignition pack. Please fit the ignition
switch, as although the ignition back to an idling current when the engine
stops, turning the prop will arm the
ignition automatically.
It is assumed that you have run large petrol engines before, and please mount the
engine with the cylinder between fuel pump and sensor cable uppermost, to a firewall
at least 1/2" thick, using high tensile 5mm bolts, shakeproof washers and blindnuts or
selflocking nuts and large diameter washers . If you choose to make a test stand,
ensure this is FIRMLY anchored to an immovable object such as a building!!! Please
do not underestimate the power available from the engine!!!!.
Starting:
Ignition switched ON, turn the prop with closed choke flap until the fuel reaches the
carburretor. Ensure your helper has a firm grip on the model and that no curios
spectators are in line with or in front of the prop.
Ignition ON, and holding the prop firmly, turn the prop 2-3 full turns to suck fuel into
the engine. Now with a firm flick, try and start the engine, the engine should fire and
stop, now open the shock flap, set the throttle just open and flip the engine over to
start it. Let the engine run at approximately 1.200 rpm for two minutes to warm up.
Thereafter, the carburretor may be finely tuned to suit your propeller by adjusting the
L and H needles on the carb. Please avoid prolonged idling on the ground as this can
lead to overheating due to lack of airflow through the fins.
L needle adjusts the low end mixture, and H adjusts the high spedd mixture. The
conical screw adjusts the idle speed.
Please note that:
1. The L influences the H mixture setting and vice versa. If the engine tries to stop
when throttling up then richen the L screw anticlockwise. The H screw should be
leaned until the engine reaches maximim revs and then backed off an 1/8 turn.
2. Dependent on cowling layout, turbulence with high and low pressure can cause
mixture inconsistencies in flight, causing richening or weakening adjustments of the
mixture to be necessary. Baffling between the cylinders will cure any overheating.

3. Remember that once the engine is warm, hot air with a low fuel/air ratio will be in
the crankcase, this may lead to reduced maximum revs when the engine is hot and a
weaker mixture, needing a slight richening of the needles to avoid an overlean
condition.
4. Although the carb has a pump, it is good practice to ensure that the tank centre-
line is on, near and close to the carburettor centre-line.
Routine Maintenance
With a new motor, you will it necessary to check the valve clearance more often than
normal, this is because the valve mechanism is undergoing the running- in process,
and the cams, pushrods and rockers are still to bed in.
If the motor does not run for a while, oil can gather in the lower cylinders, turning the
engine over a few times will normally remove this.
Take care when removing the plug caps they should be gently levered off vertically,
do'nt twist them back and forth, this will cause damage to plug and cap. When
replacing, ensure the caps go on with a double click. The plug gap should be 0,3-0,4
mm, this is factory set.
Periodically check the tightness of all EXTERNAL nuts and bolts, do'nt overtighten.
Before each days flying, do'nt forget to lightly oil the valve gear.
If fitting a cowling, you may find it necessary to baffle with balsa or light ply between
the cylinders to ensure the air passes through the fins.
Due to us having no control over the use and operation of this motor, MOKI Modell
Kft. and its agents accept no liability for damage caused to persons or property.
Warranty
On all engine parts we issue a guarantee of two years. In case of problems please send the engine
out-of-the-box to our office. Do not disassemble any engine parts. Please do not forget to add the
original invoice.
We state explicitly that use of engine with added parts or additional drive systems changing
the delivery status and / or do not have the technical release of MOKI in written form, will
terminate all guarantees.
We wish you many hours of fun with your new purchase.
Please fly quietly, safely and have many Happy Landings!
If you have any problems, then please feel free to call us.