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TOPIC: Mikuni VM 33 Carbs

Mikuni VM 33 Carbs 17 Jan 2019 07:46 #796934

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Pilots are in and the slides don't stick.
Steve
Z1b1000 1975 Z1b
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Last edit: by SWest. Reason: Caps

Mikuni VM 33 Carbs 17 Jan 2019 11:58 #796952

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Got them back on.
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Mikuni VM 33 Carbs 17 Jan 2019 17:09 #796976

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Took it up the road and back. Exhaust note is different and it seems to rev crisper. I'll take a ride tomorrow, check the plugs and post a clip of it taking off. Idle seems more stable too. B)
Steve
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Mikuni VM 33 Carbs 28 Jan 2019 06:25 #797749

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New plugs but too soon to tell. I know they're real close finally. B)
Steve
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Mikuni VM 33 Carbs 28 Jan 2019 07:10 #797750

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Look'n good Steve. Ride the peace out of it brother! B)
1982 KZ1100A-2 (sort-of)
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Mikuni VM 33 Carbs 28 Jan 2019 07:13 #797751

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With a little help from my friends. B)
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Mikuni VM 33 Carbs 13 Feb 2019 06:49 #798588

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Gotta dial in the pilots again this morning. Looks like rain this evening, off and on the rest of the week. At least I'll be able to test ride it today. B)
Steve
Z1b1000 1975 Z1b
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Last edit: by SWest. Reason: sp

Mikuni VM 33 Carbs 13 Feb 2019 10:31 #798602

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Could the soot on the spark plug base rings be oil residue?
My plugs have that too, and the insulator and electrodes look nearly as good as yours.

Last check I'm adding oil more often than I like, which may indicate the source of the base-ring carbon on my plugs. I have about 20K miles on this set of OEM Kaw rings installed in 2015.
I usually ride in the upper safe RPM range, which in my mind may account for additional piston ring wear if compared to a similar engine run consistently at lower engine revs.
Installed new Viton valve seals in 2015, but I wonder if they may not work as effectively since the cams were changed from standard to ZX at that time, but the 8K mile original valves were just checked and reused.

:huh:
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Mikuni VM 33 Carbs 13 Feb 2019 20:34 #798616

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I guess it could be but I'm thinking more it's rich up to 3/4000 RPM's. My rings were reused so I suspect they are leaking as well as I know the Viton seals are leaking. I got oil on my finger tip when I had the intake boots off. Not long ago the bases were cleaning up so that's where I'm trying to go by weaning it out little by little.
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Last edit: by SWest.

Mikuni VM 33 Carbs 14 Feb 2019 07:45 #798638

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Riding as I do, I'm having to add a qt. of oil every 350 miles or so. Changed brand to Shell Rotella T4 last year after running Brad Penn V2 10w-40 prior when the oil was staying in the engine longer.
1982 KZ1100A-2 (sort-of)
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Mikuni VM 33 Carbs 14 Feb 2019 09:03 #798647

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Yeah, using the power is good for the soul. :woohoo:
Steve
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Mikuni VM 33 Carbs 17 Feb 2019 09:10 #798808

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Need to lean them out even more.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 20 Feb 2019 10:28 #798940

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Might drop the main jet one size.
Steve
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Mikuni VM 33 Carbs 25 Feb 2019 20:47 #799234

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Still leaning it out.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 24 Mar 2019 15:31 #800978

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Leaned #1 a little and richened up the rest a tad. Getting even better.B)
Steve
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Last edit: by SWest.

Mikuni VM 33 Carbs 24 Mar 2019 18:05 #800981

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I torque my spark plugs 20 ft. lbs. per service manual. Had one plug loosen during a ride when I snugged them by hand, so it's been torque wrench from that ride on.

:whistle:
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Mikuni VM 33 Carbs 18 May 2019 08:39 #804078

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I'll run it 100 miles then check the plugs. I may drop the pilots from 17.5 to 15.
Steve


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Mikuni VM 33 Carbs 23 May 2019 07:40 #804420

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Yep, looks like I need the 15's.
Steve
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Mikuni VM 33 Carbs 25 May 2019 14:56 #804554

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Not all bad to try something new for a positive change...

:)

A couple weeks back I had 122.5 mains screwed in, and decided to try 120's. Then went to 15 pilots from 17.5 and she really came alive. Went from .6 to .5 air jets to rich up the idle a smidge and minimize the pops, then lowered the needles one slot.

Not sure what the inspiration was to go that lean, but I definitely had some old mental blockage blow out...which has been very refreshing!
Gotta open the throttle a bit more, but that is a very-good thing.

:woohoo:
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Last edit: by daveo.

Mikuni VM 33 Carbs 30 May 2019 06:22 #804857

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I'll be going with the 15's too.
Steve
Z1b1000 1975 Z1b
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