Additional notes RE: Engine running rough 1000 to 4000 rpm
- the engine is so rough under load at around 1500 to 2000 rpm that it's very easy to stall this bike from a green light.
- It struggles and then catches it's breath at around 2000 rpm like a turbo kicked in. But it keeps coughing and popping like a gran'pa from 2000 to 4000rpm.
- Also, I saw a black smoke flow out at cranking this one time. Never seen that before. I wonder if it is related.
- Fuel Pressure Regulator
- new battery
- Spark plugs
- Air filter
- Resistor to bypass O2 sensor