VM28's or BS34's??

  • Becker
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22 Oct 2009 13:36 #328912 by Becker
VM28's or BS34's?? was created by Becker
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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22 Oct 2009 14:50 #328929 by mark1122
Replied by mark1122 on topic VM28's or BS34's??
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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~ (k) / (z)

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22 Oct 2009 14:54 #328930 by roy-b-boy-b
Replied by roy-b-boy-b on topic VM28's or BS34's??
Nuff said.
1979 LTD Street Fighter.1977 KZ1000

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22 Oct 2009 17:48 #329021 by Becker
Replied by Becker on topic VM28's or BS34's??
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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22 Oct 2009 18:14 #329029 by keith1
Replied by keith1 on topic VM28's or BS34's??
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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23 Oct 2009 10:10 #329142 by Becker
Replied by Becker on topic VM28's or BS34's??
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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23 Oct 2009 18:56 #329218 by keith1
Replied by keith1 on topic VM28's or BS34's??
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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25 Oct 2009 20:59 #329659 by nads.com
Replied by nads.com on topic VM28's or BS34's??
28's eoulf

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26 Oct 2009 06:34 #329707 by KawiConvert
Replied by KawiConvert on topic VM28's or BS34's??
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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26 Oct 2009 08:55 #329721 by cafekz750
Replied by cafekz750 on topic VM28's or BS34's??
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
2 other non-Kawasaki motorcycles

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  • Becker
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26 Oct 2009 12:23 #329746 by Becker
Replied by Becker on topic VM28's or BS34's??
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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06 Nov 2009 10:40 #331785 by Blue Max
Replied by Blue Max on topic VM28's or BS34's??
just curious what is the going price for a set of VM28's?

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