Solex carburators

[Per Lindgren]

This doesnt sound right, Richard. I have zero experience with old Audis
but lots of experience with old VWs (and an old Mazda) but I have never
seen backfiring up through the carb that is caused by the carb itself
being out of tune. There has to be a reason for the spark or ignition
flames to reach the air/fuel mixture outside of the closed intake valve.
Have you checked the valves for the correct gap? Have you run a
compression test to see if there might be a burned valve seat? Or
perhaps a bent valve? Thing like these causes the combustion to run out
of the cylinder and pop inside the carb, but usually it is because the
timing is off.

PerL
87 Cq
A couple aircooled VWs


Richard Hoffman wrote:

>Hello, I am getting tired of dicking around with the carb on my 100LS. I
>rebuilt it and the car ran positively great for about a week, then slowly
>ran worse and worse and started backfiring up through the carb.  I've
>already verified that the timing is correct and the vacuum and mechanical
>advances work on the distributor.  Points and dwell are properly set. Choke
>is working correctly and is also properly set.  Plugs, wires, cap, and rotor
>are new.  Fuel filter, lines, and pump are new and the gas is good and
>clean.
>
>My 100LS club only has about 10 members, and one of them said they had the
>exact same situation because the Solex carb is so picky about being set up
>correctly.  Does anyone A) have any other suggestions or B) know a solex
>carb specialist where I could send it off to be properly set up?
>
>Thanks in advance!
>Richard
>90 CQ 221k
>70 100LS 47k
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