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Demon carb power valve? #60573 05/20/08 09:20 PM 05/20/08 09:20 PM
Joined: Jun 2004 Posts: 192 Maryland D dduster73 OP member
dduster73 OP member D Joined: Jun 2004 Posts: 192 Maryland	I have an 850 Mighty Demon on my 440, and am trying to tune the carb.It has a 6.5 power valve and is pulling 10" vaccumm at idle 1200 rpm.How do you determine what size power valve to change to? Thanks Dave

Re: Demon carb power valve? [Re: dduster73] #60574 05/20/08 10:45 PM 05/20/08 10:45 PM
Joined: Dec 2003 Posts: 5,314 Carstairs, Alberta, Canada dave571 master
dave571 master Joined: Dec 2003 Posts: 5,314 Carstairs, Alberta, Canada	If you have more vacuum than the power valve, then you are ok. There is some good tuning info out there. www.4secondsflat has a tuning video, and a tuning guide available

Re: Demon carb power valve? [Re: dduster73] #60575 05/21/08 12:31 AM 05/21/08 12:31 AM
Joined: Jul 2003 Posts: 3,378 Rancho Cordova, CA Exit1965 master
Exit1965 master Joined: Jul 2003 Posts: 3,378 Rancho Cordova, CA	1200 RPM is pretty high for an idle. The vacuum reading should be done in gear, warm, and as for which power valve, I have read either 1/2 of the reading, or 2 sizes below the reading.

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