Thats a single ring piston, so if you don't kick it fast enough you won't get a good reading as there is more leakage. I tend to think you have a jetting or reed problem. From my experience, at least in the US, the stock jetting was crap. The bike is sensitive, and the low end is poor if its not jetted right. I think this is a big part of why the bike gets a bad rap for poor low end performance. I'd like to try a 36mm carb on ours.
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