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TOPIC: Mikuni VM 33 Carbs

Mikuni VM 33 Carbs 10 Jun 2019 21:26 #805487

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Still have to lower the floats.
Steve
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Mikuni VM 33 Carbs 12 Jun 2019 17:58 #805609

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Having mini heat waves again this year.
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Mikuni VM 33 Carbs 15 Jun 2019 13:33 #805778

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Dropped main jets from 120 to 117.5
Now wondering about 15's

:whistle:
1982 KZ1100A-2 (sort-of)
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Mikuni VM 33 Carbs 15 Jun 2019 13:57 #805781

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You need to put at least 100 miles on the bike before you make any changes. You don't want to go too lean.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 15 Jun 2019 20:15 #805809

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SWest wrote: You need to put at least 100 miles on the bike before you make any changes. You don't want to go too lean.
Steve


Agreed! The 17.5's seem good, but I won't know about the 15's unless I give em a shot. Makes sense it would run lean with 20's, but the plugs don't show lean with the 17.5's...and there is no obnoxious popping on deceleration or between up-shifts with them.

Wondering if oil burning may contribute to the engine running well with leaner jets?
Any info I've seen about jetting with a header and other slight mods does not support going lean...

:whistle:

While on the subject of big jets, I picked up a handy little Motion Pro tool that makes changing the pesky things easy when the carbs are mounted on the bike. Motion Pro stopped producing this tool around 2012, but it still shows up in their jet-tool images frequently posted on ebay, though nearly impossible to find.
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Mikuni VM 33 Carbs 16 Jun 2019 19:34 #805883

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When I was fouling plugs due to old bad valve guide seals I had to drop down two steps on the pilots. Could be the same thing here only less. Still going to lower the levels 2-3 mm.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 17 Jun 2019 11:06 #805934

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Makes sense. The base rings are showing less carbon buildup, and gas mileage is improving.

Nice having this forum available for discussion now-a days, when few bike mechanics are willing to even look at older (but gooder) bikes anymore.
If you have a little mechanical aptitude and the dedication to keep these old contraptions running, the results can be quite rewarding.

:woohoo:
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Mikuni VM 33 Carbs 21 Jun 2019 21:30 #806242

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Been flying around with 115 main jets for a few days, and man oh man. ;)
The plug color is starting to look pretty good. Acceleration is like I can't even remember, and no pops in any direction.

The lean changes probably won't reduce oil consumption much, but I gotta say I am blown a way how the old engine is running now. :evil:

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Mikuni VM 33 Carbs 23 Jun 2019 20:42 #806338

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Seems to be cleaning up. I'll keep it this way for a while. B)
Steve
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Mikuni VM 33 Carbs 02 Jul 2019 15:51 #806867

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Things will change when I put on the new head.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 21 Jul 2019 07:27 #807922

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Still need to adjust the float levels. :dry:
Steve
Z1b1000 1975 Z1b
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Last edit: by SWest.

Mikuni VM 33 Carbs 21 Jul 2019 20:06 #807952

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Had to reupload the clip.
Steve
Z1b1000 1975 Z1b
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kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
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