First Time Rider
Arm chair racerNew to the board
Can anyone please tell me how far over my cylinder has been bored by the markings on this piston? 3 over? Anymore room to be bored again if needed? I plan on taking it in to a good machine shop, someone familiar with 2 strokes. Just need to find said shop. The cylinder looks pretty good but the history of this Z I am rebuilding is unknown. Thanks
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Roostin Away
Looks like .75 over, which is the 3rd overbore.
Last edited by DixiePlowboy; 06-24-2009 at 11:13 PM.
'84 ATC70.....my 8-y.o. son's ride
First Time Rider
Arm chair racerNew to the board
Does that look like a stock Yamaha oversized piston? Anyway to tell incase I just need to replace the rings? The piston actually looks really good and not very old
Power User
Lord of the trike
Wiseco
Wiseco Piston for Yamaha Tri Z 250. .030 oversize 515P3 68.75 mm Bore x 68 mm Stroke
Rob
First Time Rider
Arm chair racerNew to the board
Originally Posted by rdlsz24
Right on Rob. Thats what I needed to knowThanks
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