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Thanks Phil, I'll do that (look at the plugs after different driving conditions)
Exactly --the floats are different, and so are the dashpot springs. So it's hard to believe the carbs will be synched when there are differences between them (parts-wise)
Also, another problem that was obvious when we pulled them off was the dashpots "fell" at different rates. At first we were thinking about trying different weight oils in each to even them out (we ended up using 20W 2-cycle motorcycle engine fork oil in both). But that wasn't the problem. The problem was one of the dampers was bent. So instead of sticking straigt up, perpendicularlly, it was 2 or 3 degrees off. This caused one dashpot to take almost twice as long to fall as the other one. Once straightened out there was a big improvement in the rate at which they fell--they went from 5 seconds difference to ~1 second difference.
The car was backfiring a lot when in gear only when my foot was off the accelerator, in other words when slowing down. So I used to shift into neutral and coast to stops to avoid this. Do you think this was a symptom of carbs not balanced?
It's a B18.
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