after it shuts off, will it restart immediately?

thats always the 1st thing i check.....

from my motocross experience, you are correct, messed up filter can cause many odd ball problems

oops...i edited as you were typing lol. anywho, did you see if it will restart it imediately? i had similar problems right after my revos airfilter come off and got dirt into the motor. it would run fine and then about 4 passes down the street later and it would shut off because it lost compression and the motor would warm up and then loose compression and die then it wouldnt restart till it cooled off.

that is EXACTLY what was happening......

well i tore the motor apart as far as i possibly could tonight, didn't know such a small carb had so many pieces, and cleaned everything with Q-tips and after-run oil. i couldn't fully take it apart because i dont have a clutch tool, couldn't even get the spring off, so i just hope i got it cleaned up good enough, guess ill find out tomarrow..... oh, also blew air through the carb to clean out clogged jet holes, yeah, some sand did come out......

well DANG...... woke up around NOON thiry, got drunk at bar last night.....
and now its about to start thunderstorming so dont get to check out the MAXX today..... :mad:1

chances are you need to get a piston and sleeve. what i would recommend doing is just trading up the 2.5 for a 3.3. its only 130 i think with the old motor and it doesnt matter if its running or whatnot. just look it up on traxxas' site. its the engine replacement plan or something like that.

HMM... i might look into that

when i checked the piston and sleeve last night, it appeared to be fine, no scoring or pitting or anything from the appearance of sand or whatever, even the piston head looked really clean for a well used 2-stroke.... im used to piston heads being black (motocross, 105 octane fuel), and this 2.5 piston head was a golden brown.....

like i said, i test it out again once it stops raining, hopefully it works right again, if not, ill look into that 3.3 or parting it out on ebay

Actually, it's OK for the piston head to be a golden color. That's the oil part of the fuel "carmelizing" (for lack of a better term). If it's too clean, there is a chance that there isn't enough oil (running too lean). However, if the golden brown is more black, you are running too rich and the buildup could cause premature wear as well.

have you checked the compression? roll over the flywheel with the head on and a plug in it. see if it has pinch or it it doesnt really have any compression.

oh, its got the compression...... actually i think you mentioned that before, or was it someone else.... anyways, i does have compression, the flywheel has the "pinch" your talking about, and i can hear the suction and pop of the compression when it releases once the piston goes past the edge of the ports in the sleeve...

Did the sand come out of the carb or motor? If it came out the carb that would explain the problems. It was cutting the fuel supply off at hi rpm.

the sand came out of the carb, i think it may have been clogging one of the jets, the motor seemed clean, when i q-tipped it, only came up with carbon build up

then you are VERY lucky it there wasnt anything in the motor. chances are it could have very well been the carb.

Have to let us know after the rain stops falling.

hopefully tomarrow after i take the little tike to church