richer or leaner?

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05-16-2007 | 05:09 PM

sdmartineau

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richer or leaner?

ok, stupid question. If I install a 2 brothers slip on, will it cause the engine to run richer or leaner?

05-16-2007 | 05:20 PM

a16tony

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RE: richer or leaner?

Quote:

ORIGINAL: sdmartineau

ok, stupid question. If I install a 2 brothers slip on, will it cause the engine to run richer or leaner?

Leaner... Jet up 1or 2 sizes. 2, if you open the air box in any way.

05-16-2007 | 06:34 PM

mooredan

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RE: richer or leaner?

+1

You'll probably have to raise the needle too (i.e. lower the clip) and adjust the fuel/air screw. If modding the exhaust/intake system, you'll almost always have to rejet.

05-16-2007 | 09:32 PM

2k1w=no$

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From: Bangor, PA

RE: richer or leaner?

I could be wrong but I don't think that the stock needle is adjustable, that is why you put the N1TC needle in. You would have to try and shim the stock needle if you want to raise it.