VM28's or BS34's??

  • Becker
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VM28's or BS34's??

22 Oct 2009 13:36
#328912
I've been looking for a set of VM28's for awhile now and I have 4 rebuild kits ready to go for them. However I recently ran into a set of BS34's for free. So which set of carbs will give me better performance on a KZ810 with pods and a kerker. Are the 34's harder to tune, run, mount up?? Any other tradeoff's?? I have experience with vm's but not BS carbs. Anyone use a similar setup??
78 KZ750B3
79 KZ400 LTD
78 KZ650C2
79 KZ650C3
78 KZ650B2A
80 KZ650F1
80 KZ650E1
81 CB750K Super Sport

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  • mark1122
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Re: VM28's or BS34's??

22 Oct 2009 14:50
#328929
34's are too big. u will loose bottom end performance.
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

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Re: VM28's or BS34's??

22 Oct 2009 14:54
#328930
Nuff said.
1979 LTD Street Fighter.1977 KZ1000

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Re: VM28's or BS34's??

22 Oct 2009 17:48
#329021
damn, looks like I'm back on the hunt for VM's again. thanks guys.
78 KZ750B3
79 KZ400 LTD
78 KZ650C2
79 KZ650C3
78 KZ650B2A
80 KZ650F1
80 KZ650E1
81 CB750K Super Sport

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  • keith1
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Re: VM28's or BS34's??

22 Oct 2009 18:14
#329029
what did ya have to start with?...i would think that a set of vm26 would feed an 810 adequately.....they feed stock 1000's.....just wondering.....

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Re: VM28's or BS34's??

23 Oct 2009 10:10
#329142
I started with VM24's but this is going to be a kinda bad ass 810. cavanaugh porting, web cams, and kerkers are all going in. It won't take down lorcans 810 but it should be a fun bike.
78 KZ750B3
79 KZ400 LTD
78 KZ650C2
79 KZ650C3
78 KZ650B2A
80 KZ650F1
80 KZ650E1
81 CB750K Super Sport

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Re: VM28's or BS34's??

23 Oct 2009 18:56
#329218
Becker wrote:
I started with VM24's but this is going to be a kinda bad ass 810. cavanaugh porting, web cams, and kerkers are all going in. It won't take down lorcans 810 but it should be a fun bike.

larry would know best, but my guess would be 26 would be crisp if jetted right....28 s would probably give you a stompin top end at the expense of the low end.....again
larry knows more than most people have forgotten......

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  • nads.com
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Re: VM28's or BS34's??

25 Oct 2009 20:59
#329659
28's eoulf

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  • KawiConvert
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Re: VM28's or BS34's??

26 Oct 2009 06:34
#329707
mark1122 wrote:
34's are too big. u will loose bottom end performance.

I thought the BS34's were stock on 750's. Not saying you won't loose bottom end, but a free'er flowing carb should boost your top end compared to a smaller carb. Just my .02.
1978 KZ650 D1 ~ Carb jetting: 107.5 & 20 & 4th groove with pods and 4-1 Exhaust

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  • cafekz750
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Re: VM28's or BS34's??

26 Oct 2009 08:55
#329721
Mikuni BS34s and Keihin CV34s came stock on KZ/GPZ750s. Slide carbs and CV carbs are not the same. If the BS34s slides are vacuum operated, you should be fine.
1981 KZ750H2 - V&H 4-1 pipe, pods, jetted, clubmans, homebrew rearsets, 18" rear wheel and more.
Parting out a 1982 KZ750H3 to fund future projects
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Re: VM28's or BS34's??

26 Oct 2009 12:23
#329746
Ok. I'll tear into the bs 34's then and see what shape they are in. If nothing else they should help offset the cost of 28's.
78 KZ750B3
79 KZ400 LTD
78 KZ650C2
79 KZ650C3
78 KZ650B2A
80 KZ650F1
80 KZ650E1
81 CB750K Super Sport

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  • Blue Max
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Re: VM28's or BS34's??

06 Nov 2009 10:40
#331785
just curious what is the going price for a set of VM28's?

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