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Update: Found that the primary throttle shaft was wobbly and leaking fuel/air out the side of the carb. Going to see if it's an easy parts fix, or a just a new carb rather than chasing my tail trying to recondition it. To be continued...

Before the top end rebuild it actually ran very well... All things considering. I never had any problems besides having to re-set the point gaps; no back fire, it pulled well up hills, sat at 65 on a motorway and even the fuel economy surprised my 75 yr old dad. I clocked well over 15K miles the...

Thanks for the response! I will check for leaks! I found this https://www.aircooled.net/making-weber-progressive-dfev-work-aircooled-vw-engine/ The distributer with the rebuild kit didn't have a vacuum advance, so that'll be my first change to see if it helps. Then I'll look at the heat intake...

Hi all, I have a 1970s VW Early Bay, single carb, twin port. I have just done a top end rebuild and changed from 1600 to 16041. It idles well, but I get lots of backfire if I try and drive. I assume the carb needs rejetting, with an increase of the main jet? But I don't know anything about the...