125-200cc bad piston noise

Hi i just changed my piston in my wre 125 and now it sounds terrible the piston i took out was a genuine husky piston with A stamped on top of it i replaced it with vertex piston of the same size also with an A stamped on the top of it but its sounds awful i took the exhaust off and could see some very light scoring on the piston its now done 108 miles should i put an oversize piston in it say a B or C size any help would be great thanks

Gordon,

Did you check the piston to cylinder gap on the new piston? If you are seeing scoring it could have been to tight. Too loose will be more of a slight rattle and shouldn't score the piston. But either way you should pull the jug and check the piston gap and clean up any scoring.

I think it may be the bottom end its coming from the around the flywheel area i noticed when i changed the piston that there was lots of side ways movement on the con rod probably 2mm either way there was no up and down movement though so thought it was ok i,ve just been looking a clips on youtube and is making the same noiss as the bikes with the failing bottom ends