Carb Tuning

C130 Chief said

Jumped timing? I doubt it. If you turned the distributor clockwise, it would have retarded the timing, so you might want to put it back where it was. If you loosened the clamp bolt a lot, the distributor may have retarded itself due to internal friction, but the cure is the same, just advance the distributor. If your timing changed substantially, the distributor didn't "jump time" (it cant) something broke like your cam sprocket.

You sure you didn't knock a wire loose?

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Hmmmm, when I first started it, it was running not that bad, a little hesitant but about every 5 seconds under idle, I would hear the pop. It is more of an internal backfire rather than throught the carb. It is a little more apparent when throttle is applied. I tried moving the dist vacuum advance back(retard) a little, but then it wouldnt start, so I moved counterclockwise back(advance) back to where it would start and I limped it back into the garage, popping as that was being done. The funny thing is that it was not misfiring badly from what I could tell. It sure seems like the dist shaft is not perfectly aligned on the shaft, as it seems like it is nearly running ok, but it is skipping enough to cause the backfire. I didnt even try real hard to break it, just slightly slackened the dizzy to move it, fired the motor and it began.

Maybe I should have started it, then loosened it. I dont know. Arrrgggh!!