I'm considering another 'freshening up' of one of the 650s in the stable, and was looking at available pistons and other components. I've used mikesxs before, as have many others. Yamaha OEM can be very expensive, depending on where you look (I've seen eBay price be both reasonable and outrageous). Last dealership I looked at online indicated, I think, a price of $160/per piston 
yikes:
),
Mike's in comparison come off very good, price-wise. My last experience with their pistons found that between the two 2nd O/S pistons I got, there was maybe .0005-.0008" difference between the two, enough that the machine shop that did the boring took the time to mark the pistons for me, and point out the differencethumbsup, even though that may not have made much difference in the end. Good guys though.
Wiseco seems to make only big-bore pistons for the XS650, which I don't want to do. Have seen Wossner brand, but application/availability seems hit-or-miss. I think they may also have a coating on them for heat or seizure prevention (???
)
Where do the engine guys go for their internal bits? Just curious.
yikes:),Mike's in comparison come off very good, price-wise. My last experience with their pistons found that between the two 2nd O/S pistons I got, there was maybe .0005-.0008" difference between the two, enough that the machine shop that did the boring took the time to mark the pistons for me, and point out the difference
thumbsup, even though that may not have made much difference in the end. Good guys though.Wiseco seems to make only big-bore pistons for the XS650, which I don't want to do. Have seen Wossner brand, but application/availability seems hit-or-miss. I think they may also have a coating on them for heat or seizure prevention (???
)Where do the engine guys go for their internal bits? Just curious.
