1989 KDX200F (KDX200SR)
Has a flat spot about the middle of the rev range regardless of throttle opening.
As the revs rise the motor starts to come onto the pipe then drops off into a BRAAAHH noise then kicks back onto the pipe.
It happens at the same point in the rev range no matter what gear.
I am wondering if it could have something to do with the timing of the exhaust valves.
What is the best way to check? Can you adjust the timing of the exhaust valves?
I don't think it is the jetting as the bike runs crisply without too much smoke or ooze and the plug is a nice light tan colour.
Has a flat spot about the middle of the rev range regardless of throttle opening.
As the revs rise the motor starts to come onto the pipe then drops off into a BRAAAHH noise then kicks back onto the pipe.
It happens at the same point in the rev range no matter what gear.
I am wondering if it could have something to do with the timing of the exhaust valves.
What is the best way to check? Can you adjust the timing of the exhaust valves?
I don't think it is the jetting as the bike runs crisply without too much smoke or ooze and the plug is a nice light tan colour.