Yost power tube & S&S carb performance inquiry - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 5 (permalink) Old 11-21-2012, 09:49 PM Thread Starter
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Yost power tube & S&S carb performance inquiry

I need to gather some hands on information regarding the Yost power tube in a S&S carb. The cost is around $50. or so, but does it accomplish any noticeable improvements in the performance of an EVO 80cid. I'd like to get some feedback from anyone who operated with one of these. It tells of misting the fuel, or breaking it down to a fine mist. Is something noticed other than a lack of $50. from your wallet. Please reply.
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post #2 of 5 (permalink) Old 11-22-2012, 08:25 AM
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I tried one in my CV carb and didn't notice any difference. Playing with jetting was more difficult because you must use their jets and none of my buddies had any I could try. I ended up going to the CVPerformance unit. Similar functionality and their jets interchange with the stock jets. I got it in a kit from J&P but you can buy it separately.

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post #3 of 5 (permalink) Old 11-22-2012, 08:38 AM
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The S&S benefits more from installing a Thunder-Jet kit ... just saying.

Disclaimer : Don't believe anything I say unless you are absolutely sure that I know what I'm talking about .
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post #4 of 5 (permalink) Old 11-22-2012, 08:44 AM
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I had a Yost tube in an S&S on my 1990 FXRS. Didn't notice any great difference.
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post #5 of 5 (permalink) Old 11-26-2012, 03:17 PM
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Originally Posted by SCHMIDTYS View Post
The S&S benefits more from installing a Thunder-Jet kit ... just saying.

I agree.
On the dyno you are in control of the fuel reqirements with the 3 circuits, and the adjustable air bleed, and also, is so desired, the use of dedicated plenum lengths via their spacers.

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