Tommy said: The Harley carbs are too big for the 1835 as I tried one.The throat is too
big but a smaller venturi model should do fine. It all depends on the model and donor engine the carb comes from. The standard carb now for almost all motorcycles sold in the US now is either Mikuni or Kiehin Japanese carbs. Alot of these Japanese carbs get switched out for higher volume Edlebrock or Holley carbs made for bikes, making them very cheap on Ebay. The trick to matching up the carbs early is to take the engine size in cc's, use the formula in "The Auto Mathbook" or similar source, convert first to cid, then using the peak factory rpm, calculate the maximum cfm draw of the engine. Now calculate the demand for your engine at its peak rpm, maybe fudging a hundred rpm or so, so you are not getting air starved near top rpm. When these two cfm demands are the same or very close, the carb should be matched well for your engine, and probably will be jetted pretty close as well (some carbs may be more sensitive to jetting based on temp and humidity). The slider carbs used on bikes today are variable venturi designs with the ability to adjust to density altitude thru 15,000 feet once they are matched to the engine properly. No mixture adjustment required (Motorcycle Magazine reported the 2002 Yamaha VStar - my bike- climbed Pike's Peak without so much as a hiccup). The Bing carbs used on Rotax and BMW engines for years are also a good alternative carb, but can get pricey if you do not know what motorcycle engine has your size. From Rotax these dual carbs cost $500 a piece! The other nice thing is that you can find a local bike mechanic, trip him out by asking him to tune your plane! Jet kits and carb rebuild kits are found locally, so no specialized dealer to work with. For those using fuel to help cooling (not recommended by me, but done), these carbs lend themselves well to being over jetted, and still allowing for a good mixture, for smooth running. Just some ideas. Course if you want to eliminate all those headaches, and trade for some new ones, you can just bolt on an EFI System.... Colin Rainey brokerpi...@bellsouth.net
