34
PROBLEM
CAUSE
SOLUTION
Engine does not
start
• Fuel tank is empty or carburetor is not
primed
• Bad glowplug or dead glowdriver battery
• Fuel lines, fuel filter, air cleaner, or muffler is
clogged
• Engine is flooded due to over-priming
• Carburetor is not adjusted properly
• Throttle servo linkage not adjusted properly
• Fill fuel tank with fuel and prime
• Replace glowplug or recharge/replace glowdriver
battery
• Clean or replace clogged part(s)
• Remove glowplug, turn car over to discharge fuel from
cylinder.
Test glowplug and replace if defective
• Set idle and main/slow needle adjusting screw to
standard starting position
• Move throttle servo to neutral position and re-adjust
linkage(s)
Engine starts but
then stalls
• Fuel tank is empty
• Fuel lines, fuel filter, air cleaner, or muffler is
clogged
• Carburetor is not adjusted properly
• Engine has overheated
• Fill fuel tank with fuel
• Clean or replace clogged part(s)
• Re-adjust idle and main/slow needle adjusting screw
• Allow engine to thoroughly cool down and open main
needle adjusting screw 30° turn richer (CCW)
Bad reaction and
response from
engine
• Carburetor is not adjusted properly
• Fuel lines, fuel filter, air cleaner, or muffler is
clogged
• Low fuel pressure from muffler
• Re-adjust main/slow needle adjusting screw
• Clean or replace clogged part(s)
• Properly install pressure line between muffler and fuel
tank
Car is hard to
control
• Weak transmitter and/or receiver batteries
• Low reception from radio antennas
• Servo linkages not adjusted properly
• Recharge or replace batteries
• Fully extend transmitter and receiver antennas
• Move servo to neutral then re-adjust linkage(s)
Steering does not
work properly
• Weak transmitter and/or receiver batteries
• Bent linkages or driveshafts
• Loose steering components
• Drivetrain damage
• Recharge or replace batteries
• Check tightness of steering components and tighten if
necessary
• Replace damaged parts
Handling problems
• Shocks are not working properly
• Suspension is binding
• Improper tires
• Rebuild the shocks and replace worn or broken parts
• Make sure suspension moves freely. Replace worn or
broken parts
• Use different tires
Steering feels
sluggish or vague
• Suspension is binding
• Damaged steering servo
• Make sure suspension moves freely, and replace worn
or broken parts
• Check the steering servo for damage and wear, and
replace/repair if necessary
The car does not
drive straight
• Suspension is binding
• Steering trim is off-center
• Wheels are loose
• Damaged steering servo
• Make sure suspension moves freely, and replace worn
or broken parts
• Adjust steering trim until car drives straight
• Check the make sure the wheel nuts are properly
tightened
• Check the steering servo for damage and wear, and
replace/repair if necessary
TROUBLESHOOTING GUIDE
Summary of Contents for XT8
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