My 1987 CR125, had always had a loud ticking noise, some people had suggested to me it was piston slap..... the previous owner had supplied a receipt of the top end being resently rebuilt (about 10 hours ago).

Well the top end let go the other day (i am not sure why, it most likely was not because of the ticking but the piston seemed to have Seized.

I got everything i need to replace the top end, but now i am thinking the problem might be the bottom end, how can i check? what should i check?


What leads me to believe the bottom end is messed up, is the way the piston looked, it looked chewed up from the top end. I was reading this web page....
http://www.dansmc.com/pistons.htm (look at it midway) and it states when the piston is chewed up, the bottom end needs work.

This is how my piston look btw.


MY PISTON


This is what the web site showed it would look like if the bottom end needed work, pretty similar i think

WEB SITE PISTON, NOT MINE


Any truth to what i read? how can i check? what can i do? i dont want to assemble the top end if something is going to be wrong.

thanks in advance

-Victor

 

Well, I first would check your crank, make sure the rod has little to no side-side play/bearing intact(mine fell apart[img]i/expressions/face-icon-small-sad.gif[/img] ) and no up-down play. Pick up a clymers manual for specs on alotted "slack" in rod/bearing. If that all checks out, then you should be set to go with a new top-end. Also, my piston was chewed up like that, too but my circlip that holds the piston on the pin fell out, which is why I think the piston and head got chewed up like they did. Good luck.

 

TTT anyone else?