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Mikuni VM 33 Carbs 02 Jun 2019 05:38 #805021

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I soldered and drilled the 1.2 jets to .6 after I tried new .9 air jets when I went #20 pilots. I then redrilled them back to 1.0 with 17.5 pilots. Still a touch rich on the bottom so the 15's. I still have the .5's I made out of the .9's to try if too lean off idle.
Those are good prices.
Steve

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Mikuni VM 33 Carbs 05 Jun 2019 09:30 #805195

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Had a thought after examining spark plugs and checking compression...
Would #3 be lean due to lower compression in that cylinder? If so, would having a richer air jet in just that carb serve to compensate?

Might be from air getting by that manifold at the head. Will be installing a new set this weekend. :)

1982 KZ1100-A2

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Mikuni VM 33 Carbs 05 Jun 2019 13:50 #805205

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It would show rich.
Steve

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Mikuni VM 33 Carbs 06 Jun 2019 14:15 #805266

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Rode 80 miles today after swapping out cylinder three air jet to .5, leaving the others .6's.

Immediate improvement; smoother idle and better throttle response through the entire operation rpm range, with only a slight adjustment to the fuel screw. Hardly any pops now when letting off throttle and between gear shifts.

Will post pic showing plug condition after riding some more miles.

:)
1982 KZ1100-A2

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Mikuni VM 33 Carbs 06 Jun 2019 15:30 #805268

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Little job just got larger. :dry:
Steve

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Mikuni VM 33 Carbs 06 Jun 2019 20:16 #805280

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This is with 17.5 pilots, we'll see what they'll look like with the 15's.
Steve

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Mikuni VM 33 Carbs 07 Jun 2019 08:37 #805301

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Curious how far your rubber intake boots project inside your air box on 1 and 4, and if the air flow may be somewhat restricted compared with 2 and 3

*Approximately 150 miles later #3 spark plug color appears less-lean, and more as the others:

1982 KZ1100-A2

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Mikuni VM 33 Carbs 07 Jun 2019 12:43 #805315

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Only about an inch. The 15's seem nice but I think I set the float levels too high.
Steve

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Mikuni VM 33 Carbs 07 Jun 2019 21:39 #805342

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I think I have them too high.
Steve

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Mikuni VM 33 Carbs 09 Jun 2019 06:16 #805398

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Always wondered what they looked like running. I'll lower them then do a running check on all of them.
Steve

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Mikuni VM 33 Carbs 09 Jun 2019 09:56 #805408

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Vacuum Carb Sync?
1982 KZ1100-A2

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Mikuni VM 33 Carbs 09 Jun 2019 11:09 #805414

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Watched your clear-tube video...cool. Hadn't thought of that. :huh:

Before installing new manifolds this week, I will do a running level test. Have floats at 18mm. and was contemplating resetting them back to 17mm. (+/- 1mm) per Mikuni spec for RS carbs.

Having one different air jet in the set significantly improved the starting, idling, and overall throttle response of my engine. Now the #3 cylinder plays a whole lot better with the others.

RS Flat Slide Smoothbore carburetors:

:woohoo:
1982 KZ1100-A2

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