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Old 03-09-2019, 06:55 PM
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1/8 IC Fan
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Originally Posted by nitrodude View Post
I have 2 R2103, from Japan, and Im not sure if they have the 25% combustion chamber or the 16%.
https://www.osengines.com/engines-ca...020/index.html

Per their site it is setup to be compatible with 16%, although the site states to break in with 20%.
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