Wisco piston that is round

[Doc]

John, did it score the bore? Either way all is not lost. While 56mm is max for the 125BCNT it's std bore for TM/TC/TS/CR125's you just need to do some ring locating pin relocating to stop it hanging up in the ports.

[LWC82PE]

just something on that, when you re loate the pins, do you just drill a tiny hole and jam in the pin? how do you know the pin is going to stay in there and not work loose?

[Lozza]

Having the ring between the ring peg and the bore helps, so does a good interference fit on the peg

[asasin]

Thanks Doc the RM S piston I have just replaced twigged me to that but it comes up 60 thou short in the barrel ,so would have to lathe 60 thou off bottom , may be a way out though.The rebuilder was helpfull after all and has re honed it for free and suggested I take a small "slice" off each side of the piston and try again. Interesting that my RM B book suggests 3 thou clearance weras Wisco reccomend 2 . i will give it a shape up and try again, then go the TM piston way
Cheers
John