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What is the average increase in run time by dropping from an 8 to 7mm carb insert?

What is the average increase in run time by dropping from an 8 to 7mm carb insert?

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Old 01-21-2009, 10:11 PM
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Originally Posted by rallyebmx View Post
I'm pushin it I dont feel like breaking in my new motor in this cold. I am bringing my spare p7 with 4 gallons on it. I am sure my motor will be the least of my problems.... its my first big race
You hit your first big race with a 9 gallon engine?! I'm proud of your confidence, make 1 extra pit, kick everyones ass and let us know how it turns out
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Old 01-21-2009, 10:18 PM
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Yeah, I guess an extra pit might be in my future. We'll see how I fare....

That p7 has been bullet proof so far. I'll save all the run time experimenting for nice weather.
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Old 01-21-2009, 10:19 PM
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I was getting 8 to 8:30 in my Go 5 Port with the stock 8 venturi, I put a 6.5 with exactly the same tune, and pretty much same driving style, same pipe, same clutch, same track, same whatever you want and I was getting 10 to 10:30

but that's the only experience i've had with using different venturis
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Old 01-21-2009, 10:26 PM
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I've realized about a .30-.45 second increase in runtime with my setup when making that move, but as stated above results may vary.
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