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v-twin misfire
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v-twin misfire - May 16, 2006, 01:51 PM

I'm getting the occasional misfire from my 750 ss (I think). It only happens on the highway and feels like I've grabbed some front brake for just a fraction of a second, accompanied by a little cough from the pipes. It only does it once in a while, but what should I do to attack this problem? The cables and plugs are Nology aftermarket stuff and they're pretty new. My first instinct would be cables and plugs then to flush the fuel system (I dont' know how to do this on my bike... did it to my pickup a long time ago though when it was missing). Any more tips?


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May 16, 2006, 02:21 PM

My duc does this occasionally, usually after alot of low-RPM cruising, then suddenly going WOT up into high revs...just a little bit of plug fouling, but this is non-stock injector map...how often does it occur? any particular throttle/rpm range? does it occur after a lot of cruising?
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May 16, 2006, 02:21 PM

why did you go aftermarket on the plugs and wires?


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May 16, 2006, 03:14 PM

Aftermarket shit was installed by the previous owner...I've spent lots of money de-squidifying this duc already, I left that stuff there (but it's good stuff so I'm not concerned).

boston - yeah, I don't know if this is the same thing you're talking about, but I notice it when I'm rolling in 4th and 5th around 4k rpm, just cruising. It doesn't happen when I'm really on the throttle. It probably happens once every 15-20 miles when I'm cruising, but sometimes I go 100 without a single pop. I've got a cut airbox (again, prev. owner) and slip-ons, so I think the injector map needs some tweaking, could that be the source of the woes? I just haven't had the cash for a power commander yet.


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May 16, 2006, 03:17 PM

Those things would probably lean it out...I would check to make sure you are using the correct heat range plugs first...with just slipons and a cut airbox (ewww) your map probably isn't all that far off...but ducs can be very very touchy sometimes with respect to tuning...but I would check plugs first
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