no, i have not tried to adjust the powervalve on this engine. nor did i attempt to on my 97 cr250 (same thing). these engines use a centrifical weighted system to actuate the powervalve. it happens to be in the clutch case. so there is no ease of adjustment like the suzuki engines. the 17mm cover on the left side of the engine is only a tool to use to see if the powervalve is working and for installation and dissasembly.
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84 RZ350
96 Banshee w/ rz engine
91 LT250R w/ 03 z400 rear shock and 98CR250 engine (ITS ALIVE!!!)
86 TRX250R w/ f4i engine
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