flyrotary@lancaironline.net Mailing List Archive

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).