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Solex 36-40 PDSI single - How to check for wear?


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I've just rebuilt my carb with the standard kit.

I had a good inspection of the carb and apart from needing a through clean all seemed fine. But i've heard that these carbs do wear - not surprising after 35 years! So i was wondering what i should be looking for regarding wear signs. There didnt seem to be any noticable 'play' in any of the butterflys or linkage.

The car starts fine, but i havent had a chance to 'tune' the slow running it yet. Any guidance would be much appreciated.


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That is an excellent carb. The most common areas ofwear:

1. Fuel -Air mixture needle in bottom portion of carb

Unscrew needle and take a peek inside. The seat should not be damaged. If you crank in the needle all the way and make hardcontact with the seat, chances are that you damaged it. That is why there is a pretty beefy little spring on which the needle sits. It dissuades you from cranking in the needle too far.

2.Most of the buuterfly shafts have some play on these old carbs, but even with quite a bit of play, these carbs work fine.

3. There is some sort of a piston in the lid of the carb. It sits on top of the enrichment jet when the carb is assembled. It will eventually make a small hole in the lid. when it does, you have to replace the lid.

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Buy a rebuild kit to replace all the seals (made by Royz). There's one tiny little seal that's sandwiched in the enrichment jet under the carb body. Mine would leak from there until I used some gas resistant sealant and a seal from a rotchester carb I had handy.

The t-shafts are usually worn on these, but if you find it runs OK at idle and does not bog down from idle you are fine. Best thing to do is to have it rebushed at a carb shop. Though, it seams easier to find a nice weber.

68' 2002 DD

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