i have a 1991 honda trx 300 4×4. i got it on a trade for another atv and it came with some issues. the first is as there was no battery i attempted to kick start the atv. the decompression release valve was in the down position the entire time although the kick starter would not move. i assumed the piston was seized or locked up some way. i put some marvel mystery oil in it and left it for 2 days. came back and after applying a liberal amount of leg pressure managed to get the motor to roll over. the decomp valve is still in the down position. i then got ahold of a battery and tried the electric start and while it turns the motor over, with my finger over the spark plug hole, there is very little pressure, not enough to blow my finger from the hole. i did hear some kind of loose sound or rattling, maybe coming from the right side of the engine, when i did turn over the motor with the electric starter. i don’t know enough about the internal workings to determine what that noise is.
any input into how i should go about determining my problems would be appreciated. i have removed a head before and replaced piston/rings but never any valve work. if that’s needed i plan to take it to my repair shop.
thanks in advance for your help.
