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TOPIC: Mikuni VM 33 Carbs

Mikuni VM 33 Carbs 28 Feb 2016 16:43 #712957

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swest wrote: Used if OK.
Steve


:blink: Yep...unbuggered ones, if you know what I mean.
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Mikuni VM 33 Carbs 28 Feb 2016 17:43 #712973

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Had a friend with a new Suzuki 1000S... One day he dropped it off the stand and ever so slightly bent the handle bars and and put a small dent in the tank.... I have the bars on my bike and he bought a new tank from Suzuki ...... he said he didn't want the bike unless it was perfect ..... sometimes when I look at your bike I think of him saying that Daveo. ;)
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket....
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Mikuni VM 33 Carbs 28 Feb 2016 18:40 #712986

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Skidded under a stopped car's rear bumper one time, back in 2000. The front fender crumpled over the tire. After two hours working the dent out that day, I rode with the battle scar all that season and into the next. :huh:
Johny's had a brand new fender on ebay, promptly claimed. Best $75 ever, and now a few tiny stone chips. Never seen another NOS Luminous Passion Red one for sale since :huh:
Last summer was the pit. Some idiot drove his car up my rear tire at a stop light. Smashed the rear fender all to hell, but fortunately I had an old spare. Good as new (almost) still.
I relish new-like used acquisitions, and tolerate old age for the most part. :)
So there... :lol:
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Mikuni VM 33 Carbs 28 Feb 2016 18:44 #712988

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First thing people look at is the fender, tank, seat then the engine.
Steve
Z1b1000 1975 Z1b
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kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
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Mikuni VM 33 Carbs 28 Feb 2016 18:54 #712989

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swest wrote: First thing people look at is the fender, tank, seat then the engine.
Steve


The bike's, or yours? :ohmy: :lol: :lol: :lol: :woohoo: .... :whistle:
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Mikuni VM 33 Carbs 28 Feb 2016 18:59 #712992

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:huh: The bike of course.
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Mikuni VM 33 Carbs 28 Feb 2016 19:07 #712994

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swest wrote: :huh: The bike of course.
Steve


:unsure: :silly: :whistle:
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Last edit: by daveo.

Mikuni VM 33 Carbs 28 Feb 2016 19:13 #712995

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No comment. :dry:
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Mikuni VM 33 Carbs 28 Feb 2016 19:19 #712997

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:) Please explain the choke function of a VM33, compared with the BS34?
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Last edit: by daveo. Reason: Error

Mikuni VM 33 Carbs 01 Mar 2016 13:37 #713268

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It's an enriching circuit not a choke. A choke is a flap that "chokes" the carbs thus forcing more fuel than air.
Steve
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Mikuni VM 33 Carbs 04 Mar 2016 06:31 #713764

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Got my new vacume port adapters (AKA nipples) yesterday. They're for Yamaha fours. Two long and two short. They will work for the two inside being they are long enough to get to easily. I need to get two set screws to plug the holes the PO munged in, drill and tap new ones at the 5:00 and 7:00 position respectively. Carbs will have to come off again and will JB weld them in When I'm ready, could have made my own but $10 delivered I can do other things like my new cush drive rubbers I just got. That will be done today. I've been wanting these things for years. One thing at a time. :whistle:
Steve


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Mikuni VM 33 Carbs 04 Mar 2016 16:21 #713853

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swest wrote: One thing at a time. :whistle:


Will you install them to be accessible by reaching underneath the carbs? I was thinking about that, where the best location would be, and also that you could tap the holes and thread them in with a coat of sealant on the threads, skipping the nuts and o-rings.

If you didn't have a provision to vacuum synch the VM33's, how would you be able to get them adjusted properly?
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Mikuni VM 33 Carbs 04 Mar 2016 17:24 #713863

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The holes are already drilled and tapped. at 5:00 and 7:00 on the inside two. I'll unscrew them and JB Weld the new "nipples" in their places. The nut will act as a stop so I don't go in too far. The outside ones I will have to drill and tap myself at the same positions. I'll glue set screws into the old holes. They say setting them on the bench is good enough. HORSE PUCKEY. I put them on my carb styx and stumbling goes away at low idle. Raised my needles one notch so I have to do it again if I'm satisfied in how it runs. B)
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Mikuni VM 33 Carbs 05 Mar 2016 08:10 #713929

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Reference BS34, VM33-A14 Mikuni carburetors. When tediously tuned to attain the best possible operation, which carburetor will render the best performance, overall and otherwise? Please elaborate... :)
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Mikuni VM 33 Carbs 07 Mar 2016 16:18 #714347

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That I don't know. Are the BS carbs CV style? Here's a clip on the 33's. My slides don't have the cut outs.
Steve
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Mikuni VM 33 Carbs 07 Mar 2016 23:43 #714425

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swest wrote: That I don't know. Are the BS carbs CV style? Here's a clip on the 33's. My slides don't have the cut outs.
Steve


Thanks Steve, nice clip. The BS34 are the CV style. Vacuum lifts the slides/needles, and the throttle control cable mechanically operates the butterfly valve opening in front of the slides.
Kind of curious, since the time and expense swapping carbs will cost an unfair amount of both, and if the gain isn't worth the effort I'd rather put it somewhere else. :whistle:
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Mikuni VM 33 Carbs 08 Mar 2016 07:38 #714456

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Wonder if you outta write Larry Cavanaugh or APE etc (someone that really knows) and ask ...... modern carbs might be the way to go or maybe its not gonna be "like you say" not enough to make it worth while.
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket....
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Mikuni VM 33 Carbs 08 Mar 2016 07:48 #714459

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As I said before, a set of CV carbs might be better suited for my riding style. I go up and over the mountains to visit or on business. My 33's don't like high elevations and I'll be damned if I will stop and rejet each time.
Steve
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Mikuni VM 33 Carbs 08 Mar 2016 15:17 #714522

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swest wrote: As I said before, a set of CV carbs might be better suited for my riding style. I go up and over the mountains to visit or on business. My 33's don't like high elevations and I'll be damned if I will stop and rejet each time.
Steve


So the 33's are finicky things that work great in a consistent environment, when specifically tuned to it. But otherwise, they give grief?
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Mikuni VM 33 Carbs 08 Mar 2016 16:43 #714525

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CV carbs are more tolerant of altitude changes. You lose power at higher elevations and VM carbs become rich. That's one reason I've been trying to lean mine out. Besides, "lean is mean." :woohoo:
Steve
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