Got a Gremlin

mexican said:

i was expecting to see this kind of a gremlin

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r3badboy said:

Howdy guys, got a little Gremlin issue.
Had the bike dynoed the other day & it's still there!
What happens is the bike sort of cuts out for a split second randomly. More so when in lower gears or lower revs. On full throttle no problems.
I've changed a few maps & settled for one out of the resources page (photo) & as recommended set tps @ 0.64 & iscv @ 0.76
It dose run good & better than the dyno tune that was loaded, but that little bugger is still there.
Could it be a dirty 02 sensor? Maybe a bad earth?
Thoughts appreciated, cheers guys ✌

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r3badboy said:

Update : Sorted Gremlin
I changed plugs & leads & went for a ride...runs mint now. Plugs that I had in there were brand new & after inspecting them visually they seemed fine...BUT... the gap was not had them about 0.8 or bit less, got no idea why I had them at that, but I did check the other ones to 0.9 before I put them in. Must of had a blonde day with the other ones, I immediately told myself off & band myself from drinking
ps...haven't drunk for over 5 years

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r3badboy said:

Update : Sorted Gremlin
I changed plugs & leads & went for a ride...runs mint now. Plugs that I had in there were brand new & after inspecting them visually they seemed fine...BUT... the gap was not had them about 0.8 or bit less, got no idea why I had them at that, but I did check the other ones to 0.9 before I put them in. Must of had a blonde day with the other ones, I immediately told myself off & band
myself from drinking

Well 0.9 is almost an inch
So going to guess the gap it should b .045

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Gregger said:

I don't think the difference between .8 and .9 mm would cause a stumble (but I've been known to be wrong). That's the difference between 31 and 35 thou which the Haynes manual states is the setting for the Rocket. I bet you had a plug wire failing. Did you have any moisture in the area where the plug wire boots go into the head? Water can trap in the plug wire hole in the head if the drain ports are plugged (water should not be able to get between the spark plug wire boot and head but it's happed to me). Curious, was there any rust on the plug's exterior?

Anyway, obviously the problem was on the high volt side of things. Glad you got it sorted and passed on the fix to "the gang".

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