i hope this helps some ppl


Description of Problem

Cause of Problem -- Solution of Problem

Engine will not start

Out of fuel -- Fill tank with fuel
Wrong type or poor quality fuel -- Replace fuel
Carburetor not primed --Prime carburetor
Glow heater not charged -- Charge glow heater
Bad glow plug -- Replace glow plug
Engine flooded -- See Flooding
Engine too hot --Allow engine to cool
Carburetor set incorrectly -- Readjust carburetor
Blocked exhaust -- Clean or remove debris from exhaust system
Air filter clogged -- Remove and clean air filter


Starter will not retract

Broken spring -- Replace recoil assembly


Starter hard to pull

Engine is flooded -- See flooding
Engine is seized or locked up -- Take engine apart


Engine starts then stalls

Idle set to low -- Increase idle speed
Bad glow plug -- Replace with new
Low-speed mixture too "rich" -- "Lean" low-speed mixture
Low fuel tank pressure -- Check for blockage in fuel pressure line.
Engine overheated -- Allow engine to cool down


Engine sluggish or poor performance

High-speed mixture set to "rich" -- Lean out high-speed mixture
Leaking glow plug -- Tighten or replace glow plug
Bad glow plug -- Replace glow plug
Old or dirty fuel -- Replace with new fuel
Carburetor dirty or blocked -- Clean carburetor, check for blockage
Engine overheating -- Stop running and richen fuel mixture
Slipper clutch set too loose -- Tighten slipper clutch
Tires not glued/wheel pins fell out -- Glue tires/replace wheel pins
Engine over geared -- Use lower gearing
Bound up drive train -- Check drive train, and make it free
Engine worn out -- Replace piston/sleeve and check connecting rod


Engine overheating

High-speed mixture to lean -- Richen high-speed mixture (counter-clockwise)
Cooling air flow is blocked -- Cut holes in body to allow air flow
Nitro content too high -- Run nitro content between 10-20%
Fuel not containing correct lubricants -- Purchase a higher quality fuel
Excessive load on the engine -- Check for bound up drive train
Low-speed mixture too lean -- Richen low-speed mixture


Engine stutters or hesitates

High or low-speed mixture too lean -- Richen high first then low
Engine overheated -- Stop engine and let it cool down
Bad glow plug -- Replace with new


Engine stall as soon as you give it gas

Bad glow plug -- Replace with new
Low-speed mixture too lean -- Richen low-speed mixture
High-speed too rich -- Lean high-speed mixture


Engine stalls when I let go of throttle

Idle set too low -- Increase idle
Engine stalls for no apparent reason
Bad glow plug -- Replace with new
Engine overheated -- Shut off and let cool down, richen high-speed
Debris in fuel line -- Remove and retry
Poor fuel tank pressure -- Check hose foe clogging