Im using basic 10w40 oil, service every 5/6 k. No compression test. Yes I could check to see. I grinded the exhaust header to smooth it out to remove the "bump"(.Excuse my english im French). It seems to have improved the exhaust gaz flow a lot.This with a k & n filter and Arrow silencer. The engine is much more flexible than before.????I can go down to 2250/2500 rpm in all gear. It s a cool bike , bullet proof.
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