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 Post subject: Me again, big jet in vertical pot or horizontal ?
PostPosted: Wed Apr 10, 2013 11:52 am 
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Joined: Sun Jan 22, 2012 12:33 pm
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big jet in vertical pot or horizontal ?
Base setting again I have a 135 And a 140 Main, the carbs dont belong to this bike and I dont know whi :oops: ch pot gets the big jet ? :oops:


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 Post subject: Re: Me again, big jet in vertical pot or horizontal ?
PostPosted: Wed Apr 10, 2013 6:38 pm 
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Joined: Sun Nov 07, 2010 10:54 pm
Posts: 543
Location: Brisbane
I was told that with bevels the rear runs hotter so it gets the bigger main, but with belts which rotate the opposite way the front gets hotter so the front gets the bigger main. ?????? (but it sticks out in the cool air?)
This is a question I have wondered about for a long time.
I was told that on a belt the front cyl gets the first fire to push the crank and then the rear to keep it rotating, the front has the most work to do,opposite to a bevel.

I used the same jets in both carbs, but mine is a road bike.
I'd like to hear what seroius racers have to say about this.

graeme


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 Post subject: Re: Me again, big jet in vertical pot or horizontal ?
PostPosted: Wed Apr 10, 2013 8:50 pm 
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Joined: Thu Oct 14, 2010 7:30 am
Posts: 174
I've always run the same jetting horiz/vert. Never noticed enough of a difference between them to run the vert richer. This is on bevels and belts.Maybe I'm not WOT long enough?


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 Post subject: Re: Me again, big jet in vertical pot or horizontal ?
PostPosted: Thu Apr 11, 2013 12:43 am 
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Joined: Thu Oct 14, 2010 11:23 am
Posts: 1874
The many variations of F1s run a larger jet on the V (rear) cylinder on both the 36 and 40mm carbs and, likely, many of the Pantah engines with carbs do. Shows up in the manuals, and in many books. The rear runs hotter because it is blocked from the wind by the front cylinder; cannot risk letting it be lean. MikeV


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 Post subject: Re: Me again, big jet in vertical pot or horizontal ?
PostPosted: Thu Apr 11, 2013 3:38 am 
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Joined: Wed Nov 03, 2010 1:29 pm
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+ 1


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 Post subject: Re: Me again, big jet in vertical pot or horizontal ?
PostPosted: Thu Apr 11, 2013 6:59 am 
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Joined: Sun Jan 22, 2012 12:33 pm
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Thanks again, I have the old girl running now!


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