Yes the Solex and SU are a different animal. They are relatively simple to deal with. I never read that they are never in tune, but I can believe it. Messing with springs and needles is pretty easy and easy to test.

The thing that might make Solexes or SU's a challenge for a beginner is that there are typically more than one of them.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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