Thread: Z250 to 300cc Bore up
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Old June 19th, 2017, 06:17 PM   #15
bruce71198
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Name: bruce
Location: northern illinois
Join Date: Jan 2012

Motorcycle(s): Race bikes:08 Ninja 250,11 R6,16 ZX6,SV650.3 HD-1947,2-2003,2010. 1946 Indian and a lot of dirt bikes.2

Posts: 999
Quote:
Originally Posted by JacRyann View Post
In U.S. you can do that easily too. Sleeves are commodity items used all the time in engine-building. You can get them from LA Sleeves or Darton or any number of suppliers in a variety of sizes. Machine-shops can also mill out block and install them easily as well. The difficult part is finding the proper pistons for the desired compression-ratio.

Wayan, do you know what the compression-ratio is after upgrade?
Have you done a compression-test?
Do you have photos of pistons?

Thanks.
Buy a used ZZR600 cylinder block off ebay, press the sleeves out and, with a little machining, you can press them in place of your current 250 sleeves. This will allow you to bore up to 68mm.
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