I have a set of brand new GENUINE YAMAHA 1st oversize pistons but both have only got a mark on top of the piston with the letter 'L' ....no arrow nothing....if I was to fit these will it matter which way the 'L' face's in the barrels??
If it's an rd it will have the holes in the rear that go at the inlet
If it's an old piston ported motor with no holes and both back and front are identical it shouldn't matter
Where is the L on the piston?
hi steve I really appreciate your help on this....both pistons are marked 'L' on 9 o clock position with both open holes at 12 & 6 o clock.....I have compaired both and apart from the 'L' mark they appear to be identical all round even internialy....just worried that I could have them fitted wrongly and the piston rings affect the bores??? whats your thoughts