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engine trouble

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dandun

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Location
Greensboro, NC
RC Driving Style
  1. Bashing
i am having trouble with my nitro engine. it idles perfect but when i run it for a lil while and get it up to normal temp the problem starts. if i try to throttle it at all it starts to choke and if i hold the throttle it will choke and quit. if anybody has any idea whats going i would like to kno. thx
 
is you mill broke in??
you need to lean out the high speed needle.just a little at a time. sounds like your running to rich
 
not that i kno of i mean i have overheated it before where it was smoking but it seems to be at normal running temp but i mean thats what I'm thinking cause it seems like the fuel is being evaporated when it hits the carborator but other than that there is no signs of overheating
 
dandun said:
yup the mill is about 13 months old and i just have been having this problem recently
Click to expand...

have you tore it down yet?

if not tear it down and look at the internals... check the rod bushings.and play in the bearings..


but before doing this check for any air leaks..............................

sorry i got ahead of my self
 
yea acutally i just recently broke the crankshaft so i tore the engine apart actually a couple of times cause i couldnt start it then figured out that i put the piston in backwards anywayz i took everything out and it all looked fine i checked the carb and nuttin looked wrong and i checked the tank and the line and it all looks good idk whats wrong
 
dandun said:
yea acutally i just recently broke the crankshaft so i tore the engine apart actually a couple of times cause i couldnt start it then figured out that i put the piston in backwards anywayz i took everything out and it all looked fine i checked the carb and nuttin looked wrong and i checked the tank and the line and it all looks good idk whats wrong
Click to expand...

ok if every thing check out good then. IMO you need to lean out your hsn..

your getting to much fuel 1/8 turn in at a time
 
that didnt work so i emailed the company and they said that it is probably a worn piston and sleeve, but is there anyway to tell if the sleeve or piston needs to be replaced?
 
try turning the engine at the flywheel. If there's no or very little resistance, then that's a sure sign it needs to be replaced.
 
ok thx

now if i get a new piston and sleeve i need to do the break in process all over correct?
 
Correct. It will need to be broken in again, but try this first.

Put the nose of the truck against something firm so it can't get away from you. If you have an EZ start, keep it running while moving your LSN one way or the other till it starts to run.
Adjust your LSN and idle screw till it idles well and will run up to half throttle. (get it to running temp before you finalize any settings) When it idles properly, throttle it to half and see if it stalls or bogs down. If it stalls, it's too lean. If it bogs, it's too rich.
Now go to full throttle. This is when you adjust your HSN. Same thing. If it bogs, it's too rich, stalls, it's too lean.
When it seems to be running good, pinch the fuel line. It should speed up slightly and then stall within 3 - 4 seconds. If it stops quickly, your LSN is too lean. If it takes longer, the LSN is too rich.
Drive it for a while and then take a temp check to make sure it's at the proper temp. If it's too hot, richen the HSN.
You will have to make small adjustments on the HSN almost daily to compensate for outside temperature and humidity.

By the way, the factory settings are for break in, or a starting point if you really messed things up. Once an engine is broken in, don't expect it to run right by going to those settings.
 

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