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Message started by dan49829 on 07/22/13 at 08:14:45

Title: Carb jet kit
Post by dan49829 on 07/22/13 at 08:14:45

I just installed a 6Sigma jet kit in my 06 S40. It's still backfiring, and I can't seem to get the mixture screw set right.

With the mixture screw fully seated, I have the highest rpm, turning it counterclockwise, the rpm's begin to drop at about 1 1/4 turns.

Loud backfire on deceleration, and a poof at shutdown

Pilot Jet 57.5

Main 150

added two metal spacers under the e-clip for a total of 3 metal spacers under it.

Altitude is about 600' here

Stock muffler has two 1/2' holes drilled in the end

Title: Re: Carb jet kit
Post by PhantomII on 07/22/13 at 08:23:24

I installed the same kit this weekend 57.5 pilot, 150 main, 2.5 turns out, and no washers mine only backfires once in a while I live 48' above sea level and my stock muffler has 8 1/4" holes drilled in it and stock air filter. I don't know if you can get rid of all the backfires or not if you can I would like to know what else I can do if not I can live with it the way it is now.

Title: Re: Carb jet kit
Post by verslagen1 on 07/22/13 at 08:23:45

poof at shut down and no adjustability, sounds like you should go to a 55

bang at shift is usually a header/muff air leak
you have 2 holes drilled in the end, not sure if that's the cause.

or you got your idle speed set to low
or your tev needs cleaning

Title: Re: Carb jet kit
Post by dan49829 on 07/22/13 at 08:47:13

Thank you! I'll start with the idle setting since that's the easiest, but what is the TEV?