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Michael,
You certainly done some research on carbs if those sites are any indication, but I only had a quick look so far.
I worked out, from my single calculations of 44mm, that the 3 x 34mm were marginal ( for a 2 rotor) and may be good to 165hp only, where as the 3 x 36mm would get you to 180 hp. These are only rough calculations - do you know what size Tracy used and what HP he was getting. If 160 hp is enough then that's fine.
George (down under)
George:
I must apologize I got the model and make wrong. As a kid in Venezuela I was
a Bultaco trials rider and not up to speed on the japanese street bikes.
The carbs came from a Yamaha XS 750 not Suzuki. They were also used on the
1100cc bike in a set of 4 and a set of 2 for the smaller bikes.
It is a constant velocity diaphragm type carb.
The carb model is the Mikuni BS34-11 2H7-00 CD
(34 denoting the throat size in mm) I believe I figured that ideal for the
13b would be 3 carbs in 36mm but this was as close as I could get.
http://www.dansmc.com/carbs/Japanese_Carbs/Mikuni_Yam_XS1100.htm
They are Mikuni type II carbs that were stock on the 1978-79 XS 750 bikes
the 76-77 XS used Mikuni type 1 carbs and the 80-81 XS used Hitachi carbs.
The type II carbs will fit all years and models of the Yamaha XS and
generaly considered the best of all the three types used. They are easy to
work on and parts are readily available.
A good guide on carb sizes and what bikes wear them may help you pinpoint
the right model and zise to look for, for your single rotor.
http://www.cyclewareables.com/pages/street_carburetor_menu/carburetors_street_menu.htm
here are a few handy links for the BS 34 carbs
http://www.mikesxs.com/mikesxs-fuel_system.php?category_id=4.3
http://www.factorypro.com/tech/carbtun.html
http://www.dansmc.com/carbs/Japanese_Carbs/Carb_pics.htm
http://www.crc2onlinecatalog.com/misc_carb_parts.htm
http://www.xs11.com/tips/maintenance/maint30.shtml
Michael in Maine
----- Original Message ----- From: "George Lendich" <lendich@optusnet.com.au>
Michael,
3 x 34's would do it for a 2 rotor. I have been looking for a carb for my
single but would require a 44mm and thought a couple of smaller carbs
might
do it - the bigger carbs get expensive. The only problem with more than
one
carb is you need to balance them, but for a ingle rotor they could be
staged.
I didn't know the Suzuki's had Mikuni carbs, I might look out for some of
those.
George ( down under).
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