Pitcherman
Well-known member
Ok I’m at a loss chasing a high AFV percentage.
The bike is a 2005 xb12s with right at 11,000 miles. I bought it with a drummer exhaust and it has a race ecm in it, allegedly with a dyno tune. I have all the paperwork provided by the previous owner, but take that with a grain of salt I suppose.
A while back I noticed it was starting to act as though it had an intake leak and I confirmed it with some carb cleaner testing around the intake seals. I bought a buelltooth and checked the AFV and sure enough it was 110%. I opted to pull the frame off the bike and check everything over while doing the intake seals. I decided to replace the plugs, wires, and clean off the grounding points while I was at it. Long story short I didn’t install the seals properly the first go around and immediately had to redo my work.
Everything is back together now and sealed properly. I’ve verified the intake seals with carb cleaner and a smoke system I have for checking for vacuum leaks. The TPS is set and bike runs and idles fine. For some reason the AFV percentage continues to sit around 110%. I’ve set it back to 100 and after a 50 mile ride it returned back to 110. I do have some popping on decel so I’m inclined to think the bike is in fact lean.
I tested my fuel pressure and its sitting right at 51psi all the way up to 3000rpm. I’m sort of at a loss where to go from here. I could replace the O2 sensor but I don’t think that’s the issue. Perhaps pull the injectors and ultrasonic clean them.
Any thoughts on where to go from here?
The bike is a 2005 xb12s with right at 11,000 miles. I bought it with a drummer exhaust and it has a race ecm in it, allegedly with a dyno tune. I have all the paperwork provided by the previous owner, but take that with a grain of salt I suppose.
A while back I noticed it was starting to act as though it had an intake leak and I confirmed it with some carb cleaner testing around the intake seals. I bought a buelltooth and checked the AFV and sure enough it was 110%. I opted to pull the frame off the bike and check everything over while doing the intake seals. I decided to replace the plugs, wires, and clean off the grounding points while I was at it. Long story short I didn’t install the seals properly the first go around and immediately had to redo my work.
Everything is back together now and sealed properly. I’ve verified the intake seals with carb cleaner and a smoke system I have for checking for vacuum leaks. The TPS is set and bike runs and idles fine. For some reason the AFV percentage continues to sit around 110%. I’ve set it back to 100 and after a 50 mile ride it returned back to 110. I do have some popping on decel so I’m inclined to think the bike is in fact lean.
I tested my fuel pressure and its sitting right at 51psi all the way up to 3000rpm. I’m sort of at a loss where to go from here. I could replace the O2 sensor but I don’t think that’s the issue. Perhaps pull the injectors and ultrasonic clean them.
Any thoughts on where to go from here?
