Thank you very much for the info,The bottom end checks out OK.I have rebuilt a few motors when I was younger but I seem to be getting really paranoid about things as I get older.I am gonna just bore it,new rings,bearing,pin and run it.
No,the cylinder is in good shape but I figured being that old I would bring it back to spec.It's only 30.00 for boring and I have a nice round cylinder.I am not sure how to check the crank,There dosnt seem to be any up/down play.Is it ok to replace the rod bearings and not the rod? I really want tthis motor to be right so I dont have to tare it down for another 10 years.I have never had this bike running so I dont know the history of the motor,I would guess it was sitting for a good 6 years.
I have a 1974 TY250 that I recently bought and before I started the bike I pulled the cylinder off.I found the piston which is standard bore was cracked.I bought a new piston 1st oversize and was going to replace the bearings on the crank.Is it a good idea to use the stock rod and replace the rod bearings or should I buy a new rod? Is there a way to tell if the low end is good or bad besides the obvious? Thanks for any help
Mike