OFNA Racing Ultra MBX Comp - Manual (Page 33)

• TROUBLE SHOOTING GUIDE
PROBLEM CAUSE SOLUTION
Fuel line not primed Fill fuel tank and pressurize tank by capping exhaust
ENGINE WILL NOT START Glow plug will not heat(lite) Check glow plug battery heater or replace plug.
Engine flooded, too much fuel Check carb. needle setting. Do not over prime.
Remove glow plug and poor out fuel.
Needle valves not setup Check needle setting for break-in.
Servo linkage not correct Check linkage for correct radio neutral.
Carb. barrel closed Check for slight barrel gap, 1/6th
Fuel tank empty Check fuel level and prime fuel line/carb.
Glow plug bad Even if plug heats, change to a known good plug.
ENGINE STARTS AND Master needle closed Check master needle setting
STOPS Engine is too hot Check needle settings
Low end is too lean Check low end needle, factory set.
Needle are not correct Check needle settings
SLOW THROTTLE Fuel pressure in tank Check pressure line to tank and lid seal.
RESPONSE Linkage not opening Check that throttle is fully open at full throttle on radio.
Batteries in car are low Turn off engine and replace car batteries.
Batteries in car are low Turn off engine and replace car batteries.
Radio batteries are low Turn of engine and replace radio batteries.
CAR IS HARD TO CONTROL Reception from radio bad Check antenna and batteries. Also, loose screws on
OR NO CONTROL AT A chassis can interfere with radio.
DISTANCE Car radio is wet Turn off engine and dry radio rec’r with air. do not run
again until fully dry.
Low battery in car Replace batteries before running car.
Low servo power Standard servo used in this kit are only 50ioz, up
graded servo with 70 or more will work better.
STEERING SLOW Battery pack is dead, quickly A rechargable pack is recommended (5 cell 600AE)