I've been running a 1.5" bore Zenith-Stromberg (CV type) not an SU, carb on my 650 for a couple years now. I made the manifold using 1" copper tubing pieces I cut and soldered together. Then I used a 1.5" brass fitting to mount the carb to it. That fitting took some doing the get it to match up with the 1" tubing,,, God I was I had something more than common hand and power tools,,, maybe a machine shop,,
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But, I have been pretty happy with the outcome, better mileage, more low end torque and only one adjustment for the mixture. I started out with a carb off a 1500CC Triumph, car not bike. Then I got a NOS carb off a 1300CC something or other, I can't remember what it was from, off Ebay. When I contacted the seller about it and asked him some questions and told him what I was doing with it, he sent be a bunch of spare parts for it including a package of 4 diaphrams it. I don't know if it was my imagination or what but that one made it run even better, I don't know if it was because it was jetted for a 1300CC and that just happens to be 2 times the capacity of my 650 and the bikes rev about 2 time what car does but, it's working good and I'm enjoying it.
I had to do it just because I was told it couldn't be done. I just enjoy a challenge I guess.
Ride and Wrench Safe
Post edited by: The Milkman, at: 2007/07/22 18:46