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59096 · July 23rd, 2019, 04:57 AM

Bought a pretty ratty looking 1990 GPX250 for a parts bike. It had 65000km on it and was real cheap. Got it running and couldn’t believe how well it went. Nice quite motor that idles perfectly with no carb problems what so ever. Runs nicely right through the rev range and topped out at 170kph. Only noise was the usual rattle from the clutch basket. So instead of using it for parts I decided to make a cafe racer out of it as all the plastics were wrecked.

Got most of the bodywork, frame and wheels refurbished and before putting the tank back on decided to do a valve adjustment. Found all the exhaust valves to be at 0.005”, just about perfect. Two of the inlet valves were at 0.004” which is also just about perfect but the other two (one on each cylinder) were set at 0.013”. Couldn’t believe it ran so well, and quietly also, with both these inlet valves so far out of adjustment? Both the suspect valve adjuster nuts were tight so I can only assume the previous owner set them this way accidentally on purpose? Go figure?

July 23rd, 2019, 04:57 AM	#1
59096 ninjette.org member Name: Garry Location: Bungendore Australia Join Date: Jan 2019 Motorcycle(s): GPX250 1989 model and 1990 model Posts: 98	Valve adjustment so far out? Bought a pretty ratty looking 1990 GPX250 for a parts bike. It had 65000km on it and was real cheap. Got it running and couldn’t believe how well it went. Nice quite motor that idles perfectly with no carb problems what so ever. Runs nicely right through the rev range and topped out at 170kph. Only noise was the usual rattle from the clutch basket. So instead of using it for parts I decided to make a cafe racer out of it as all the plastics were wrecked. Got most of the bodywork, frame and wheels refurbished and before putting the tank back on decided to do a valve adjustment. Found all the exhaust valves to be at 0.005”, just about perfect. Two of the inlet valves were at 0.004” which is also just about perfect but the other two (one on each cylinder) were set at 0.013”. Couldn’t believe it ran so well, and quietly also, with both these inlet valves so far out of adjustment? Both the suspect valve adjuster nuts were tight so I can only assume the previous owner set them this way accidentally on purpose? Go figure? __________________________________________________ Perpetua Culpa Alterna Vagus