Piston Kits

[Jammy-G]

When looking for piston Kits, what does the +x stand for?

"PK376 Yamaha Piston Kit STD RXS100


PK377 Yamaha Piston Kit + 0.25 RXS100


PK378 Yamaha Piston Kit + 0.50 RXS100


PK379 Yamaha Piston Kit + 0.75 RXS100


PK380 Yamaha Piston Kit + 1.00 RXS100


PK381 Yamaha Piston Kit + 1.50 RXS100


PK382 Yamaha Piston Kit + 2.00 RXS100 "

How do I know which I need? i'm guessing it's the measure of how much wear the cylinder had so you buy the kit according to that, but how do i find out the wear?

Cheers.

[Scooby]

If you don't know the size of the bore then you need to measure it. The +'x' is merely for barrels that have been rebored, for example a +0.50 piston kit is for a barrel that has been rebored to +0.50mm. If you don't know the full history of the bike then measure the bore before you order a kit.
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A big enough hammer fixes anything!

[Jammy-G]

I know it hasn't been rebored at all, so I will be looking for the standard?

Cheers for your reply.

[kev]

Take it you meen the X in RXS100, well that the the model of the bike the piston kit is for.
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20:02:36 Jammy-R6: any holes a goal
20:02:48 kev: even if its a hairy mans arse
20:02:56 Jammy-R6: hell yes

[Jammy-G]

[Kickstart]

Hi

Not only the rings, but also the piston will be a different size. Cheats way to do it is to take the head off and check the size of the existing piston (stamped on the top 99% of the time).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Jammy-G]

[priller]

[Kickstart]

[priller]

If you taking the barrel off don't forget to stick some rags down the crankcase mouth incase the rings are broken.

[go_fasta]

while we're on this subject, I have a CG125 which needs reboring and a new piston (it got seized up). The only piston I could get hold of is .75 oversize, so will it be ok if I just send the barrel to be rebored as long as they know what size the piston is? and how much would it cost?

cheers

i was going to start a new topic but i saw this and thought it would go better in here. someone tell me if i shouldn't have done.
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If you cant fix it the first time
KICK IT HARDER!!!

[Kickstart]

Hi

Yes it will be fine, except that you are wasting a couple of rebore sizes. They will probably want the new piston with the barrel to do a good job of boring it.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing