first off i would like to say hi to everyone on here.

ok, so i have an 86 trx250 fourtrax (shaft drive) im rebuilding, and have run into a snag. when running in 4th or 5th gear and i crack the throttle i get a cracking noise from the front of the drive shaft (closest to engine), im not sure if it is the u-joint or not. this also happens when slowing down, but it does not happen in 1st-3rd, no matter how hard i hit the throttle. has anyone ever experienced this?

 

ok so i replace the u-joint, and the noise is still there, seems to be internal at the back for the engine, and you can feel it in the left foot peg, i drained the oil and inspected it, and there were no shavings of any sort. adjusting the clutch makes a small bit of difference if i back it all the way out but then all im doing is tearing up the clutch by slipping. somebody got to have some idea, HELP!!!!

 

I hate to say this but it sounds like a tranny problem with 4th & 5th gear. They must have something in common inside the tranny.

 

i was afraid somone would say that, but why would it only happen now on deceleration and not on acceleration

 

I don't know enough about tranny's to answer that. But I do know that some of the gears share certain other gears.

 

not really the reply i was hopin for, haha. but thanks for the input, at least that give me a starting point

 

I know. The reply you wanted was "Oh, mine has made that same noise for years. It's nothing. Keep riding." No such luck though.

 

oh well, im gonna ride it regardless, and see what happens, at least on the bright side, if somthing does happen, my own labor is free labor. thanks for the input