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 BBK oversizes 
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Post BBK oversizes
I'm being lazy here; does anyone offer oversize pistons and rings for freshening up BBKs? Mine has about 23,000 miles on it. I was 'thinking' about doing the Cannonball and need to go through everything on the scoot. I know I could just buy a new kit, but just exploring options.


Sun Sep 24, 2017 8:00 am
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Post Re: BBK oversizes
If they sell kits then they sell the parts in kits as well.


Sun Sep 24, 2017 3:47 pm
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Post Re: BBK oversizes
Icecruncher wrote:
If they sell kits then they sell the parts in kits as well.


Not always. And even when they do offer parts like an oversized pistion by the time you bore the sleeve out and order the pistion and rings it can cost just as much as a whole kit

And say it's an Al bore that is plated to over bore it you need to replace the bore

Then you have to wonder if there is even enough wall in the sleeve to be able to bore it out larger

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Sun Sep 24, 2017 5:53 pm
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Post Re: BBK oversizes
steel sleeve yes.

nikasil.......... NO

what size bbk? 58.5? i got 59mm but has to be steel sleeve.

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Mon Sep 25, 2017 10:35 pm
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Post Re: BBK oversizes
steel sleeve 58.5.


Tue Sep 26, 2017 9:54 am
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Post Re: BBK oversizes
so 59mm forged piston will work.

will need the piston kit, comes with rings, wrist pin and clips.

also need a bbk gasket kit.

i have all of that.

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Tue Sep 26, 2017 10:16 am
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Post Re: BBK oversizes
Stopped by the RC website to look for 59mm piston stuff, didn't see, but got easily distracted.

What does a 66mm with a +3.2 come out to be?


Tue Sep 26, 2017 5:24 pm
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Post Re: BBK oversizes
sorry it's not on my website. i only put the main items on the site.

piston kit is about $85 shipped. comes in 59mm forged with japan RK rings, wrist pin and c-clips.

if you buy the gasket set same time it's $10 bucks. will need new metal head gasket and cylinder paper base gasket. can't re-use those either.

my 66mm with 3.2mm stroker crank comes out to 209cc.

stock stroke is 57.9mm

you can use this site to calculate.

http://www.nightrider.com/biketech/calc ... cement.htm

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Thu Jan 04, 2018 4:15 am
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