If The Engine Fails To Start; Final Adjustment - O.S. engine MAX-21VZ-R Owner's Instruction Manual

IF THE ENGINE FAILS TO START

Check the following:
Glowplug battery discharged or glowplug defunct.
Fuel not reaching carburetor.
Engine flooded. Do not over-
prime. (This could also cause
hydraulic lock and damage
the engine on application of
the electric starter.)
Remove glowplug, close
needle-valve and apply star-
ter to pump out surplus fuel.

FINAL ADJUSTMENT

Run the vehicle (with throttle fully open) over the
longest available straight course, in order to observe
the model's speed. Next return the car to the starting
point, close the Needle-Valve 30˚ and repeat the run,
taking note of the improvement in performance.
Continue with further runs, gradually reducing the
Needle-Valve setting and aiming to achieve the
highest straight-line speed. Remember, however,
that, if the Needle-Valve is shut down too far, the
engine will overheat and, accompanied by visibly
diminished exhaust smoke, the model will lose
speed. At this point, throttle down immediately, stop
the vehicle and reopen the Needle-Valve 45~90˚.
Having established the optimum Needle-Valve
setting, check the Mixture Control Valve setting as
follows.
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