engine misfire
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Stage III
Joined: Aug 2007
Posts: 3
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engine misfire
79 shovel.Crane Hi 4 Ignition,Drag pipes S@S SuperB. myProblem is bike seems to die at hi rpm almost as if ignition was shut off. accelerates hard right up to ready to shift then shuts down and backfires out the exhaust any ideas what this could be ign mod coil ground any ideas is great although i dont think its carburation[&:]
thanks
thanks
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Joined: Jan 2006
Posts: 95
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From:
RE: engine misfire
could be your not getting enough fuel to the carb, fuel filter ? or the petcock screen ? too small offuel line ? sounds like the bowl is draining faster than it can fill it up. maybe, just a thought.
Cruiser
Joined: May 2007
Posts: 207
Likes: 1
RE: engine misfire
The wiring from the negitive side of the coil to thetriggering device.(ign. unit in your case). Just as a heads up, I have seen problems like this caused by tachometers. you might want to just disconect the tach.( if you have one)from the negitive side of the coil and see what happens.
Seasoned HDF Member
Joined: Aug 2007
Posts: 21,709
Likes: 17,550
From: Driftless Area
RE: engine misfire
It does sound like a rev-limiter but:
In the past, I have had 2 of the Hi-4 coils go bad on me. They would be fine up until I was in the middle of a trip. Then it would seem as if I wasn't getting fire to both cylinders. Took me a while to figure out that a defect in the coil was slowly eating the plug wires. After the 2nd one, I went back to points, dual-fire, and Accel coil.
Crane should stick to grinding cams.
In the past, I have had 2 of the Hi-4 coils go bad on me. They would be fine up until I was in the middle of a trip. Then it would seem as if I wasn't getting fire to both cylinders. Took me a while to figure out that a defect in the coil was slowly eating the plug wires. After the 2nd one, I went back to points, dual-fire, and Accel coil.
Crane should stick to grinding cams.
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Outstanding HDF Member
Joined: Jun 2007
Posts: 3,306
Likes: 5
From: Bellville, Tx
RE: engine misfire
I've run the little DynaS breaker for 10 yrs and had no problem, beats hell out of points. Did experience a similar situation while accellerating up to 90 mph, cut out completely but was able to get it running w/throttle(accel pumping) til I slowed to 60. Happened only once, must have been a clog at petcock, could not repeat. Thought ign at first, but when pumped is started running so it must have been fuel related, possibly stuck float needle. Good luck!
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Cruiser
Joined: May 2007
Posts: 207
Likes: 1
RE: engine misfire
Yeah, I have had the same Dyna S on my 89 FLHT since it was like 3 months old. the only problem I have had with ign. was with a Dyna rev limiter I installed after a missed shift caused a little valve stem seal problem. I removed it about a year ago due to intermitent no starts (that was a hard one to find, evey time I lifted up the tank to check for coil trigger itwould start, turns out I had the rev limiter grounded to the tank bolt, and dummie me took about 3 hrs to figure this out.)
I have never been muchof a fan of crain or accel.
I have never been muchof a fan of crain or accel.
Stage I
Joined: Jul 2012
Posts: 1
Likes: 0
From: Wisconsin
I have similar problem with 81 shovel. Happened a month ago with Keihen carb. I put on S&S Super E & thought problem was solved. After 2 tanks of gas it happened again. It does restart & if I keep it at 60 mph & don't get on throttle I get home. I suspect the petcock screen is the culprit but now I am considering coil. Would rpms have anything to do if it is petcock?
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