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Larger carbs for GS1000 vintage racer

  • Thread starter Thread starter wera racer
  • Start date Start date
W

wera racer

Guest
Racing my just-completed GS1000 at the Barber Vintage Festival next week and am already making a winter to-do list to modify the motor. I'm interested in learning more about swapping the 26mm carbs for 29mm (I believe the Yosh/Cooley bike used 31mm, but that seems overkill since I won't be able to do all the internal work they did). Any advice? Is it a straight swap? I think I would need larger diameter intake boots and open up and polish the intake manifold, among other things. I don't see any on eBay, so how readily available are they? Many thanks
 
29mm Smoothbores pop up, expect to pay $500 -800 for a good set

You can use the Z1 intakes from Z1 Enterprises for them

If you can't mod the motor much, that's about as big as you can go

Some people use the KZ 28mm carbs that have the accelerator pump instead

GS Road Racer would know - he's built a few in his day, it would appear
 
I just put the VM 29 Smoothbores on my 1000E engine, fits the old manifolds and boots perfectly, no changes are required except go to a manual petcock, or just run it on PRI. There's no vacuum port on the smoothbores to operate the vacuum petcock. They fit exactly the same otherwise, the old cables fit the carburetors too. Still getting the jetting dialed in, but I like them so far.
 
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