Trouble getting my carbs tuned

[Graysen Harris]

i recently got a bpipe installed on my 2012 SJ and I'm having a hard time to get my carbs dialed in right.
Anyone know somthing can help?

 

[fastgtfairlane]

Did you pull the carbs and rejet according factory pipe website?

 

[Pro-pulsion]

Also, are your carbs synchronized? If one carb is hauling more air through than the other, you'll never get them tuned to work together. You need an air flow meter to know what each carb is actually pulling for air volume. I recently recalibrated a pair of 38's, one was pulling just over double the air flow, the engine ran like a bag of hammers. Just that change alone made purr like a kitten This is what I use, the smaller one if I recall will fit everything up to 48mm. Shove it into the carb opening and adjust the rear carb to match the front.

Snail Type Syncrometer Carb Sync Tool, GERMAN, SK Model - Aircooled.Net VW Parts

The best carburetor syncronizing tool made for us to syncronize dual carburetors. Rather than measuring manifold vacuum via a restriction, it sensitively and accurately measures airflow WITHOUT RESTRICTION. This is the top quality GERMAN SK Gauge.

vwparts.aircooled.net

 

[LBS4]

There is a wealth of info, the Mikuni manual, FPP has a writeup on their website, there are a couple of really good doc's here in the tech section. This guy is great at explaining the basics in a video format:

 

[kevbo]

I could never get any good information from reading a plug after a 3 second run.

 

[kevbo]

Let me add, I now power tune full throttle with a tach and tune pilot/popoff just rich enough to respond well. A B8ES plug always end up dark brown with this setting.