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I have a fully restored carb by Martyn Bratby ,beutifully machined . The issue is that its a 389 with a 1 1/8" bore . The standard carb is 1 1/16" . Its not a simple change as other components will need a little work. The bike is fitted with a filter system and Higher than std comp pistons from a 650. . What do you think?.
No trouble at all. You may…
No trouble at all. You may have to play about with choke and throttle cable lengths but it will work great. You didn't mention air filter - obviously if you have one for the 376 body it will not fit the 389 body directly. Try a 250 main jet, 25 pilot , 106 needle jet and posn 4 on the needle. I had those settings on a low tuned T110. Good luck Bob, Howard
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Carb slides
Hi Robert,
If the 389 has a standard Atlas No.3 slide, you will possibly find it will run a bit rich at part throttle- my 650 certainly did (but I have twin 389's on my 650). I'm sure I have similar settings as Howard mentioned, but I had to go to 3.5 slides to get it to run well.
Regards,
George
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I think mine has a 31/2…
I think mine has a 31/2 slide so should work .Will probably still run a bit rich due to the very close tollerances its been built with.
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