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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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Old 8 Nov 2006
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Aftermarket or genuine pistons???

Gday all.
As part of the ongoing saga with my XT, the next step for me is to remove the barrel and get it honed and get new rings for the piston.
I'm considering replacing the piston, just in case the old one has a hairline crack in it (or something similar), which may (or may not) be causing the problems i'm experiencing.
I'm interested to hear from anyone who is using or has used any aftermarket pistons in their XT600, particularly Wiseco pistons.
I was told by my yamaha dealer that the genuine yamaha pistons have a higher silica content compared to the wiseco pistons, meaning that the expansion / contraction properties of the yamaha ones are better, allowing you to run tighter tolerances.
Has anyone experienced any rattling / piston slapping or oil burning when using a wiseco piston (as the tolerances will be larger)?
All thoughts and comments welcome.
Cheers, Dan.
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Old 9 Nov 2006
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I haven't run a Wiseco piston to know,but I have a 97mm Wiseco piston here with a broken skirt,but no idea how it happened.It came out of an SRX600,not that that means anything.I have also weighed them - the Wiseco is 100g lighter than the same size ProX.
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Old 9 Nov 2006
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I would use the oem for durabilty, because I don't like the extra clearence need for the wiseco. Check and compare the pricing , I dont recall there being much diffrence. also I belive the wiseco comes with diff comp ratios and not all oversizes are avaible in stock.
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