Carb Upgrade – Rejetting

< 4 Wheels — Jeff Eske on June 24, 2013 at 2:15 pm

Finally had time this weekend to re-jet the carburetor on my 2001 Sportster 1200 Custom (XL1200C).  I’m now up to about a Stage .5, since all I’ve done is some minor carb work.  I haven’t replaced the air cleaner with a high-flow unit or replaced the stock pipes yet.  Turns out that I received the wrong intake gaskets, so I wasn’t able to replace them.  I don’t know if I ordered the wrong ones or if they pulled the wrong ones.  It doesn’t really matter at this point, since I was just going to replace them as a precautionary measure.

I love how straightforward and easy the Keihin carb is to work on.  It reminds me of my days as an auto mechanic, back in the 80s; fuel injection was just beginning to take over on new cars and there were still as many carbureted cars coming into the shop as there were FI cars.  I also like only having one carb for multiple cylinders, like a car, so that you don’t have to deal with carb syncing, etc.  On my past import (Japanese) bikes, carb syncing was a pain in the @$$.

Anyway, the Dynajet kit went in with no issues.  I stuck to the 160 main jet, that they recommend for stock setups.  While I was in there, I also replaced the stock .42 pilot jet with a .45.  I don’t know if it’s the dynajet kit or the pilot jet, but seat-of-the-pants testing would indicate a fair improvement in low-end driveability.  Previously, it seemed kind of starved when trying to accelerate.  Now, it just seems to have more “oomph” when I hit the throttle.

Hopefully, soon I’ll be able to spring for a higher flow A/C, and may re-route the crankcase ventilation while I’m at it.  I’m not sure what to do with the exhaust at this point.  I’m a fan of “rumble”, but not “loud and obnoxious”.  We’ll see.

Jeff Eske

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