10-05-18, 11:40 PM
Electrical faults can exhibit the behaviour your describing. If you have a weak spark, the bike can start to misfire (fire on 3) as you open the throttle. On full throttle it bogs down, back off on the throttle and the engine picks up and revs smooth.
This is because the electrical resistance of the air/fuel mix changes with throttle position. Often misdiagnosed as a fuel or air flow problem.
Personally my money would be on a corrosion issue around the head/spark plug/ caps leading to a lost voltage and arcing around the outside of the plug.
I might be wrong but this is an issue I've had a couple of times with my bike.
This is because the electrical resistance of the air/fuel mix changes with throttle position. Often misdiagnosed as a fuel or air flow problem.
Personally my money would be on a corrosion issue around the head/spark plug/ caps leading to a lost voltage and arcing around the outside of the plug.
I might be wrong but this is an issue I've had a couple of times with my bike.
-suck-squeeze-bang-blow-