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INSTALLATION, OPERATING, MAINTENANCE—JCV 360
JCV MOTOR s.r.o. , Vikýřovice 562, 788 13, Šumperk, Czech Republic—Europe, www.vernermotor.com, [email protected]
IT IS FORBIDDEN TO START THE ENGINE WITHOUT PROPELLER TO
PROTECT ENGINE OVERREVVING OR OVERHEATING, WHICH CAN CAUSE
ENGINE DEFORMATION.
Adjusting carburetors while engine is running:
Set throttle in position, that engine is idling and let it warm up at least for 50°C (122F) - oil
and water.
Set idle to 2300—2600 RPM by adjusting idle screw. (engine must run smooth— otherwise
increase idle RPM)
Lo, Hi screws adjusting:
Increase throttle and watch engine run. Two options can happen:
A) Engine is hesitating to speed up and chokes. This is weak mixture case. There is a
serious risk of overherating and seizing of the engine. Engine should speed up easily.
Loosen LO screw for 1/8 turn and check engine run again.
B)
Engine speeds up easily, but vibrates too much (rough running). This is rich mixture
case. Engine has low power and creates too much carbon particles, which can damage
piston and cylinder liner. Screw Lo screw in for 1/8 turn and check engine run again.
Lo screw must be adjusted, so that engine can speed up easily and run smoothly. Lo screw
mustn´t be screwed too much in, because that can cause engine overheating
After the engine has been shut down and cooled, the spark plugs should be removed and the
color of the ceramic at the points observered. A correct mixture will show a rusty brown
color. Light gray to white color indicates a lean mixture that can result in overheating
the engine. Dark brown to black color indicates a rich mixture that can result in excess carbon
deposits. Note that the plug color test must be done at both low rpm and WOT (wide open
throttle) by running the engine for 30-60 seconds at the rpm to be observed. A normal
shutdown should be done by moving the throttle to idle, observing the engine is at idle rpm
and then shutting down.
