yamaha

I have been plauged with a misfire problem for a few weeks now. The wideband has been reading around 10.5 idle, but then run's around 12.5-14.7 in trottle and WOT. I was talking to dmdicks from Alpine, and he stated to another member of EXD that he believes the beta does not need colder plugs until 12psi +. I went out and bought stock plugs and kept them at the stock gap, .044 to see that the engine would do. I drove around for about five minutes to let the ecu learn some of the curves, and so far it has started to lean out, and stay around 12.5. If this happens again, could it be that the SMT may need some more fine tuning? HELP!

Pictures of the BKR6E-11 plugs just pulled out of the engine.

Jay-M

yo,

i'm on msn... got sometime, just tech'ing a meeting here

yamaha

Misfire came back after driving home at 60mph at 2000rpm. What's weird is that it happens when the AFR is at 12.5, which is not lean or rich at all.

Alex01tib

dude 10.5 at idle? thats rich as hell. AFR at idle shouldnt be right around 13, that could be a source for the fouling.