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Carb problem: Dual Sidedraughts "cough" mid-throttle |
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2001/5/3 7:04
From 48 North
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Any one ever had this problem?
* Idles well
* Runs great at full throttle
* At mid-throttle it will run OK for a second, slow down, then backfire out the air filter. Then idles fine.
I've spent all day trying to figure out what is wrong. Did a compression test, retorque & re-adjust valves, swapped plug wires for a known good set. Re-tighten inlet manifold bolts. Removed soft-mount insulators and bolted carb straight to the manifold. Nothing has made a difference.
Plug #3 looked like it was running different from the others (cleaner burning). Compression is good. Spraying WD-40 over the manifold gasket and carb base gaskets doesn't make any difference. I don't think there is a leak. I did have some slight leaks but got those fixed.
I know bad plug wires can cause a mid-throttle backfire. But I've swapped wires. Also the slow-down then backfire is unusual. It won't stay running at part throttle.
Posted on: 2008/7/5 6:04
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