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KZ440's with Mikuni VM carbs
- Dbrown4k
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24 Oct 2024 14:24 #905413
by Dbrown4k
KZ440's with Mikuni VM carbs was created by Dbrown4k
So I’m very new to this forum as well as motorcycles but I’ve been getting a ton of info on here. I was also looking to do a single carb conversion and came across another thread on here detailing how the guy did it on his 440 with a custom manifold and vm34. I’d link it on here but I don’t know how. The original carbs on mine are cv 36. My question is isn’t that bigger than a mikuni vm34 especially since it’s two of them? Thanks for the help
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- TexasKZ
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26 Oct 2024 13:00 #905484
by TexasKZ
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
Replied by TexasKZ on topic KZ440's with Mikuni VM carbs
Yes, 36 is larger than 34. However, as a rule, mechanical slide carbs, like the VM series, flow noticeably more than a similar sized CV ( constant velocity) style carb. On a twin cylinder bike, only one cylinder at a time draws in fuel, so the engine could not draw enough to make a CV72 even work at all.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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- TexasKZ
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26 Oct 2024 13:04 #905485
by TexasKZ
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
Replied by TexasKZ on topic KZ440's with Mikuni VM carbs
P.S. Are you considering this modification? If so, I recommend finding some threads that ended with success.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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- gd4now
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26 Oct 2024 13:36 #905491
by gd4now
1977 KZ650 B1
Pods and Denco header
OLD KAW OWNERS SMILE ALOT
Replied by gd4now on topic KZ440's with Mikuni VM carbs
Hey just to add some more to the topic here is a quote from a book I found in the Seattle Lib system many years ago, Motorcycle tuning by John Robinson for what ever that is worth.
"For the same sections area a slide carb flows more than a CV carb by some 20% or more. A smooth bore flows about 5% more than same size slide carb. A flat slide has better air flow under it edge at part-throttle allowing better control of part-throttle carburation and better pick up. Smooth bore - with a min of steps and surface irregularites are also more receptive to pulse tuning in the intake and will show larger increases in air flow when intake length is resonant with engine frequency".
"For the same sections area a slide carb flows more than a CV carb by some 20% or more. A smooth bore flows about 5% more than same size slide carb. A flat slide has better air flow under it edge at part-throttle allowing better control of part-throttle carburation and better pick up. Smooth bore - with a min of steps and surface irregularites are also more receptive to pulse tuning in the intake and will show larger increases in air flow when intake length is resonant with engine frequency".
1977 KZ650 B1
Pods and Denco header
OLD KAW OWNERS SMILE ALOT
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- Nessism
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26 Oct 2024 18:20 #905501
by Nessism
Replied by Nessism on topic KZ440's with Mikuni VM carbs
I don't know what it is with the twin guys, but they don't like to rebuild carbs like the rest of us. There are lots of threads where guys dump serious $ into Murry carbs, or VM conversion kits. And many struggle thereafter. While the thought of a new carb is alluring, these old Mikuni and Keihin carbs are very easy to work on, and fixing the stock setup is the path of least resistance in most cases.
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- TexasKZ
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27 Oct 2024 11:35 #905516
by TexasKZ
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
Replied by TexasKZ on topic KZ440's with Mikuni VM carbs
Amen!I don't know what it is with the twin guys, but they don't like to rebuild carbs like the rest of us. There are lots of threads where guys dump serious $ into Murry carbs, or VM conversion kits. And many struggle thereafter. While the thought of a new carb is alluring, these old Mikuni and Keihin carbs are very easy to work on, and fixing the stock setup is the path of least resistance in most cases.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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- Injected
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27 Oct 2024 12:33 #905518
by Injected
Replied by Injected on topic KZ440's with Mikuni VM carbs
There was also a guy a while back that put a set of Chinese knockoff 36VM's on a KZ400 engine. I remember they ran just fine, but they had oddball threads on the jets!
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