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Author Topic: XS500 - single round slide carb  (Read 217 times)

Offline bbarshte

  • Posts: 3
XS500 - single round slide carb
« on: Oct 22, 2018, 17:02:26 »
Hey folks, I recently picked up a 77 Yamaha XS500. The plan is to go from 2 BS38 carbs to a single Mikuni round slide carb.
Ive got Dean Speed Customs fabricating a 2 into 1 manifold and next is to order the carb I need.

Problem is I'm not sure what size to go with. I know, tuning wise, this is going to be a difficult undertaking, but if I can get the carb size right, itll make things a lot easier going forward.

I would be extremely grateful for any shared knowledge regarding what size Mikuni round slide I should consider, and additionally, any thing else I should keep in mind.

Thanks

Offline der_nanno

  • Posts: 424
  • Faster!
    • Greasy Greg
Re: XS500 - single round slide carb
« Reply #1 on: Oct 22, 2018, 17:14:43 »
As a non-butterfly (i.e. non CV) carb will flow about 30% more air, a 34mm roundslide should probably be enough. If you can buy a cheap 36mm carb, that won't kill you either. I wouldn't go bigger than that though or you will have great difficulty setting up the low-end.
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Offline bbarshte

  • Posts: 3
Re: XS500 - single round slide carb
« Reply #2 on: Oct 22, 2018, 19:14:38 »
Excellent, that's great insight.
Thanks so much.

Offline cxman

  • DTT SUPPORTER
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  • Posts: 2525
Re: XS500 - single round slide carb
« Reply #3 on: Oct 22, 2018, 20:51:20 »
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline bbarshte

  • Posts: 3
Re: XS500 - single round slide carb
« Reply #4 on: Oct 22, 2018, 22:11:47 »
Thanks, i really appreciate the insight