oversize bore?

[Guest]

I have some jugs I've been wanting to put on my bike, but one of the sleves looks a little too rough for a hone to clean up. Since I'm going to buy new rings anyhow, I was wondering about going to oversize pistons while I'm at it.

[Nessism]

There are various options for over sized pistons, but they are expensive. The cylinder will have to be bored, which will add further to the cost. Cheaper solution is buying a low mileage cylinder w/pistons on ebay.

[crapwacker]

true, but it might end up being torn up like the one I have. I got that one cheap, but return shipping for refund would have been like spending money on nothing

[crapwacker]

and I can't find oversize pistons for the 850 available, so it kinda makes it mute

[Big T]

You could swap out the bad sleeve, or all of them, just by heating the cylinder block in the oven

[crapwacker]

You could swap out the bad sleeve, or all of them, just by heating the cylinder block in the oven

I did not know that... I'll be on the hunt for them now

[Nessism]

You could swap out the bad sleeve, or all of them, just by heating the cylinder block in the oven

It's not that simple.

If you look at a stock cylinder assembly you will see colored paint marks next to each sleeve. The color is in reference to some close tolerance dimension related to the interference fit of the sleeve into the aluminum cylinder. You can't use just any sleeve into any cylinder since they won't match properly. I know because I tried one time and the cylinders didn't fit tightly.

[GabrielGoes]

It's not that simple.

If you look at a stock cylinder assembly you will see colored paint marks next to each sleeve. The color is in reference to some close tolerance dimension related to the interference fit of the sleeve into the aluminum cylinder. You can't use just any sleeve into any cylinder since they won't match properly. I know because I tried one time and the cylinders didn't fit tightly.

oh snap lol

[crapwacker]

Well damn the sleeve, and IF I were to look to oversize the pistons, has anyone done this with a '79 850? How much; .5mm or 1mm? and other pistons that could be used? Yeah, I know, I could just sell mine(GIVE it away for what I have in it) and get an 1100 (even MORE than I have in mine). I'm just looking to get the most bang for the buck. Hell, the gaskets are $100.