Reply to "UPDATED - Backfire under Low RPM / Load (4th or 5th Gear)....."

ufo-lowI really DO need a bigger hammer!

Rocky,

Just read through your problems and the suggestions. I am not a carb expert by any stretch, so I'm thinking in other directions. A few of my thoughts:

Verify your crank / cam timing has not shifted due to worn timing gears & chain, jumped tooth, sheared pin, etc. Do you know what is in there?

Verify the ignition timing mark on the damper is true TDC. (I am assuming that is what you are using).

What are the details of your ignition set up; stock or not, points, EEC, or what?

Failing to find any other issues, you might want to do a compression and / or leak down test to check for valve problems.

Good luck and let us know what you find.

4/14/168:07 PM

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