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TOPIC: Mikuni VM 33 Carbs

Mikuni VM 33 Carbs 30 Jun 2017 06:33 #765723

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Took a ride up and down the HWY. The main thing I wanted to know is if it would bog on roll on. It doesn't. The ;pilots are less responsive though.
In the old Clymer manual I had that was stolen years ago there was a performance section that showed how to change the cutaway from 2.0 to 1.5. The one I bought in the 90's has it listed on the cover but that section is missing. It involves filing the bottom of the slides but I'm having trouble finding it online. Anyone have a old Z1, Z1a, Z1b Clymer on their shelves? The early Z1's had 2.0 slides and this was a common mod at the time.
As it stands now, it's obvious I need smaller pilots with the larger mains. I'll pick some up on Monday.
Steve
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Mikuni VM 33 Carbs 02 Jul 2017 17:48 #765928

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Checked the plugs. I'll pick up #55 pilots tomorrow. Still a little rich. I'm going to add this guy to my thread. Good advice.
Steve

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Mikuni VM 33 Carbs 02 Jul 2017 18:39 #765936

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Anything like this?

1982 KZ1100A-2 (sort-of)
January 2016 BOTM

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Mikuni VM 33 Carbs 02 Jul 2017 18:56 #765937

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The one I had was from the 80's.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 03 Jul 2017 20:25 #766009

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I might put them in tomorrow. The bike runs great but I think it could be leaner.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 07 Jul 2017 11:53 #766317

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I think it's running lean midrange and that's when it's burning oil.
Steve
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Mikuni VM 33 Carbs 09 Jul 2017 10:03 #766478

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Hey Steve don't 2.0 slides had a bigger cut away than the 1.5s so you can file 1.5s to make em 2.0s but not the other way around ??
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 09 Jul 2017 11:40 #766486

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The way I understand it, you can file .5mm off the bottom and make them 1.5. To make them 2.0 you have to make the cutaway taller.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 15 Jul 2017 06:27 #766987

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Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 19 Jul 2017 07:15 #767302

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Z1b1000 1975 Z1b
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kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Mikuni VM 33 Carbs 20 Jul 2017 13:45 #767395

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It just got more complicated.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 20 Jul 2017 19:36 #767409

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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 21 Jul 2017 15:28 #767460

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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 21 Jul 2017 21:35 #767471

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Not today.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 22 Jul 2017 20:44 #767513

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May have to go back to the 60's.
Steve
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Mikuni VM 33 Carbs 23 Jul 2017 15:28 #767554

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One thing leads to another. Need new carb holders now.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 24 Jul 2017 05:53 #767585

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Ordered new ones.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 24 Jul 2017 15:51 #767630

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Back to her old self again.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 26 Jul 2017 20:20 #767782

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Gettin better.
Steve
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Mikuni VM 33 Carbs 27 Jul 2017 16:47 #767848

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May have done the trick. While searching I found a quote saying 99% of carb problems are electrical. I don't know about that but in this case it might be true.
Steve
Z1b1000 1975 Z1b
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