Misfire Cylinder 1 and 3

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Re: Misfire Cylinder 1 and 3

Post by Mikewire » Jul Sat 27, 2013 7:17 am

I'd swap out the pertronix and go back to points and condenser. Or swap in a spare dizzy if you have one extra. Sounds good ignition related for sure.

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Re: Misfire Cylinder 1 and 3

Post by Roadhog » Jul Sat 27, 2013 10:41 am

Just did a compression test, 160-165psi all around on a cold engine.

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Re: Misfire Cylinder 1 and 3

Post by Roadhog » Jul Sat 27, 2013 1:14 pm

MikeWire wrote:I'd swap out the pertronix and go back to points and condenser. Or swap in a spare dizzy if you have one extra. Sounds good ignition related for sure.
You really think so? It sounds like it's only misfiring at idle, where there's no advance... odd. I wish I had another dizzy to try.

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Re: Misfire Cylinder 1 and 3

Post by Mikewire » Jul Sat 27, 2013 2:38 pm

Hows the charging system? Battery have 12+ volts? Did the key get left on over the winter?

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Re: Misfire Cylinder 1 and 3

Post by Roadhog » Jul Sat 27, 2013 2:49 pm

MikeWire wrote:Hows the charging system? Battery have 12+ volts? Did the key get left on over the winter?


Charging system is good, battery is a "bad core return" from work which was actually in perfect condition and only a year old so I snagged that for it.

This is seriously driving me insane. Something so simple is being so complex. Lol

I can only think it's the carb, but on the other hand it should cause both cylinders on one side to misfire, and not just one on each side.

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Re: Misfire Cylinder 1 and 3

Post by Mikewire » Jul Sat 27, 2013 3:45 pm

Wait, so have you verified no spark on 1 and 3? Before moving to fuel I would check the ignition first. It should be 100%.

I mentioned leaving the key on as a possibility because the Pertronix can burn out if left on for an amount of time. Just a possibly to rule out.

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Re: Misfire Cylinder 1 and 3

Post by Roadhog » Jul Sat 27, 2013 4:35 pm

MikeWire wrote:Wait, so have you verified no spark on 1 and 3? Before moving to fuel I would check the ignition first. It should be 100%.

I mentioned leaving the key on as a possibility because the Pertronix can burn out if left on for an amount of time. Just a possibly to rule out.
No, they have perfect spark all around. Sorry for the confusion. Just odd because I have spark, fuel, and correct timing and compression. No clue why the two flywheel side cylinders stay dead.

I just grabbed some B5ES plugs to replace the B6ES ones that I've been running. Maybe a hotter plug will help them at idle.

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Re: Misfire Cylinder 1 and 3

Post by MT-Getto » Jul Sat 27, 2013 8:18 pm

I hate to ask, but is there any chance you have plug wires crossed?
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Re: Misfire Cylinder 1 and 3

Post by YASHA7FOLD » Jul Sat 27, 2013 9:34 pm

Ooh good question.


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Re: Misfire Cylinder 1 and 3

Post by Roadhog » Jul Sat 27, 2013 11:47 pm

MT-Getto wrote:I hate to ask, but is there any chance you have plug wires crossed?
hehe nope. Fair question though, because i thought that too, then i swapped them and got a "banging" show.

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