on the weekend i took the head off of my engin just to give her a bit of a clean
and when i had the head off i turned the flywheel so the pistion would sit at the top
and i watched it for a little bit and it started to slide down
now the question is can u tell if my engin needs a rebuild
or when the engin needs a rebuild dosent it slid down
thanks heps

it needs a rebuild when its either using too much fuel , not making the power it used to, or is running crap, not like it used to. basically when its performance is bad where you think its worth it to spend the money.

Dann

oh thats crap ive only ran though 4 and a half leters of fuel
oh well thats what u get for runing nitro
im thinking about geting one of those real 2 stroke engins
there quiet cheap at my LHS so i might put one on labuy

Looking at the piston and sleeve, when it is visibly scratched, you may be approaching rebuild time. Assemble then engine and put the glow plug in. Turn the flywheel. It should be difficult to turn it past tdc if there is good compression. If you can turn the flywheel easily with one finger all the way around, it's rebuild time. Of course, if the engine is still running well, don't bother rebuilding it.

Clearest symptom of an engine that is approaching rebuild time: Engine will start and run fine, until it warms up to temp. Then it dies and will not start again until cooled. If this is your motor, spin the flywheel while the engine is still warm (don't burn yourself). If it spins freely with no compression at tdc, it's probably rebuild time.

ok thanks onces i get these head screww ill try that, but right now i just got my car siting
there, i gave it a big clean i striped every think, its never being thins clean but lol
it will just get dirty in a few days from going to the track
thanks heps for ur help

Yeah, I take mine all apart everytime I run it, I'm anal about keeping my rc's clean! It's good luck lol