Cylinders 3 and 4 are not firing.

If it's broken or just needs tweaked

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Cylinders 3 and 4 are not firing.

Postby Tommysparta » Sun Oct 06, 2019 3:02 pm

1982 cb650 -This is driving me crazy. The bike ran good several weeks ago. The number 3 cylinder is not firing. NOW.... both 3 and 4 are not firing. I'm getting spark to both plugs, there is fuel in both carburetor bowls. I would look to the coil if it was either 1 and 4, or 2 and 3, but 3 and 4 ???? Can't figure this out

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Re: Cylinders 3 and 4 are not firing.

Postby GeorgeSweety » Sat Oct 12, 2019 2:17 am

Hi Tommy, you say that there is fuel in your carb bowls but is the fuel getting through to the combustion chamber? After trying to start the bike have you removed the plugs from 3 and 4 to see if they are wet with fuel? If there is no fuel on them I would suspect either blocked jets or fuel rail.

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