Extreme rich will be sluggish on power and have a misfire sound while holding a steady throttle position. Decided to buy a 12v powered AFR gauge and the bike read 10 AFR at cruising!!!!! I jetted it down to 13.2AFR ran like a champ with no misfire go figure.Įxtremely rich or lean mixture can be confusing and the symptoms are almost identical unless you've experienced them enough times to pick out the differences. I went through every electrical circuit on the bike and found nothing wrong. I went as far as even buying a brand new CDI box and it didn't fix it. I had this problem when I converted a carbureted CRF450R for street use, it was way rich when cruising and sounded like a misfire. What tuning setup does your bike have on it? PCV, FTECU? Is it showing any codes on the dash? If it's extremely rich, it can cause a misfire sound. I have heard this on other bikes that had tune problems and I've even heard it on my FZ07 the first couple rides I did when the tune was way off with the stock O2 being disconnected while I was starting to tune with the autotune and PCV. It's possible that it may be tune related.
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