Quote Originally Posted by MotoDrunken View Post
Hi Carl! Very interesting what Forchetto said previously, about his results with the more generous clearances he have tried and seemed to work so well for him. Know of any possible reason the official recommended clearances differ so much? Is it normal for this kind of engine to get out of adjustment so early as 660 km?
Thanks in advance.
Sorry to answer instead of Carl, but I've owned many 4-strokes in the past and I've never had an engine that needed the valves adjusting this early. Perhaps they had not settled with recession, but were simply too tight from the factory.
My experience is that the valve clearances tend to open up with mileage, not close up.
The settings I mentioned in the main post (IN 0.10mm EX 0.15mm) work well enough, but produce a noticeable clicking sound when hot. Don't know if that will accelerate wear on the valve gear to any extent.
Now it seems as if Qingqi have decided on another set of clearances...I wish they made their mind up... Can't help thinking that as this is a Suzuki DR200 like engine, why are the specs not the same?. I can only assume that they fit a different camshaft to reduce power output, the same way the Suzi has a 31 mm carb against the Qingqi's 28mm.