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General Category >> Rubber Side Down! >> S40 stock carb
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Message started by BOBD on 11/02/12 at 03:52:59

Title: S40 stock carb
Post by BOBD on 11/02/12 at 03:52:59

What carb. would be a direct replacement for the stock carb on a 2012 S40? I messed up the air screw on the stock one and wonder about replacing it with something else. I mean the air screw is really really screwed! Hope it doesn't cost too much to do. Or does someone have a stock one with an air screw that works?

Title: Re: S40 stock carb
Post by verslagen1 on 11/02/12 at 09:13:18

Any of the replacements we've found are generally for performance improvements. Hence we live with the changes we need to make to get them to work.

VM36 or 38, requires a new throttle cable, rejetting.

The stock carb is a BS40, we generally go down a size because this carb has a butterfly whichs restricts the flow of a 40.

A 36 will have better low rpm performance, a 38 maybe equal. ask lancer, he's messed with it the most. A 40 will have real good top end, but be iffy at idle.

Title: Re: S40 stock carb
Post by BOBD on 11/02/12 at 10:07:07

160512130C0107050E51600 wrote:

Thanks for the info. I bought a used stock carb from Cavi Mike for $50. I'm going to use it. The air screw has never been touched. Still has the cap over it.

Title: Re: S40 stock carb
Post by LANCER on 11/02/12 at 17:22:54

As soon as you get the carb and remove the cover from over the pilot screw, soak it with a penetrating oil of some kind for a couple of days, applying the oil 2-3 times/day.
You want that screw to turn EASILY to avoid tearing it up, and BE SURE to use a screw driver that fits the screw slot snugly.
You should also clean the screw head with carb cleaner before putting the driver to it to eliminate slipping.