My fairly new to me 02 ST1100 has developed a bad stumble/misfire that sure appears to be a fuel starvation issue, but maybe not. I'm hoping to get some diagnostic help here before I start opening things up for a look.
The symptoms:
* Under constant throttle, at approx 3500 - 4000 rpm there is a noticeable stumble / misfire.
* Under hard acceleration in the lower gears the engine revs freely until approx 7000 rpm and then falls on its face. It misses and cuts out until it eventually reaches 8k.
* When doing a 5th gear full throttle roll-on from approx 3000 rpm the bike bucks, stumbles, cuts out, etc and won't go over 4200 rpm.
The bike starts easily, and cruises smoothly under 3500 rpm, or above 4500 rpm.
Where do I start diagnosing this?
The symptoms:
* Under constant throttle, at approx 3500 - 4000 rpm there is a noticeable stumble / misfire.
* Under hard acceleration in the lower gears the engine revs freely until approx 7000 rpm and then falls on its face. It misses and cuts out until it eventually reaches 8k.
* When doing a 5th gear full throttle roll-on from approx 3000 rpm the bike bucks, stumbles, cuts out, etc and won't go over 4200 rpm.
The bike starts easily, and cruises smoothly under 3500 rpm, or above 4500 rpm.
Where do I start diagnosing this?