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TOPIC: Mikuni VM 33 Carbs

Mikuni VM 33 Carbs 09 Mar 2016 16:09 #714663

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Well, I got my new pilot screws. 2&3 slots looked good. I should have ordered four. THIS IS ANOTHER REASON PO's SUCK. The new ones have a hole in them thus the 1/4 to 1/2 turn adjustment. I could tell the PO had soldered the holes and changed the tapers on them but WTF? :pinch: The new ones look like they have a jet hole in the tip too. I got four O rings. I've tried others but they wouldn't fit. I'm going to put them in the bike now and plan on installing my new vacuum "nipples" tomorrow. I'll sync them then.
Steve









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Mikuni VM 33 Carbs 09 Mar 2016 16:54 #714675

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Put them in. A little grease. the O rings slipped right in. The new ones are in 1 & 4 3/4 turn, it idles. 2 & 3 1 1/4 turn, idle comes up like on the 28's. As I suspected the O rings make the screws more effective. I'll order 2 new ones later and more on the carbs tomorrow.
Steve
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Mikuni VM 33 Carbs 10 Mar 2016 15:05 #714763

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After work this morning I went into town. The bike ran great and I did another high speed pass in the usual place. Better response but a few miles later it started a lean misfire. That's what I mean by putting some miles on it before doing anything else. I'll readjust the pilots but it looks like I'll have to wait until Saturday to do more work on the carbs. Check the float levels, install the new vacuum "nipples" and sync them.
BTW, I put in 130 mains. They are marked AB. No difference compared to the 125 Mikuni mains. I wanted 127.5's but they didn't have them. I'm going to my daughter's next week so I'll stop by Chaparral and get some GENUINE MIKUNI's. :angry:
Steve
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Mikuni VM 33 Carbs 10 Mar 2016 15:19 #714766

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swest wrote: After work this morning I went into town. The bike ran great and I did another high speed pass in the usual place. Better response but a few miles later it started a lean misfire. That's what I mean by putting some miles on it before doing anything else. I'll readjust the pilots but it looks like I'll have to wait until Saturday to do more work on the carbs. Check the float levels, install the new vacuum "nipples" and sync them.
BTW, I put in 130 mains. They are marked AB. No difference compared to the 125 Mikuni mains. I wanted 127.5's but they didn't have them. I'm going to my daughter's next week so I'll stop by Chaparral and get some GENUINE MIKUNI's. :angry:
Steve


Would that "high speed pass" have been at WOT!!! :evil:
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Mikuni VM 33 Carbs 10 Mar 2016 15:37 #714770

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Yup, I got a clip of it but it makes me look like I do it all the time. I do like leaving the Slow Birds in the weeds though. :evil: :whistle:
Steve
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Mikuni VM 33 Carbs 10 Mar 2016 18:25 #714797

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Most of the pricks are old. I know I am but they are in their 80's. They will do anything they can to keep me behind them. I love the looks on their faces as I pas them by. Nothing new. Guys my age resented me when I was young. I don't treat younger guys that way unless their STUPID. :evil:
Steve
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Mikuni VM 33 Carbs 10 Mar 2016 20:33 #714833

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Yep, them old Harley pan-heads are really something. :ohmy: :whistle: :blush:
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Mikuni VM 33 Carbs 10 Mar 2016 20:48 #714835

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I like the old pans. I hear they had unlimited top end. :woohoo:
Steve
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Mikuni VM 33 Carbs 10 Mar 2016 21:20 #714838

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swest wrote: I like the old pans. I hear they had unlimited top end. :woohoo:
Steve


Wish I still had the 73 right-shift Sporty, at least just to look at. That thing was the bomb, but nothing like the Kaw...yes, unlike a Harley, you can't kill them however hard you try, because...they won't die!

Passed my share of Harley jerks with noses in the air, and one thumb pointed down in seeming despair...lol
Sad for them, while viewed in the mirror. B)
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Mikuni VM 33 Carbs 12 Mar 2016 05:20 #715060

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Moved subject from Electrical to Carburetor today :)

The Electrical Spark Plugs of Color discussion has brought us back to the carbs, so... :huh:

The carburetors were carefully synchronized a few days ago with a Morgan Carbtune Pro, and I'm loving the synch out of it. :cheer:
I wish the needles were adjustable, but are just raise-able with washers.

I really wonder what that FSM spec mentioned earlier for main jets is all about. It seems odd for the center carbs to have different main jets than the outer two, but that is what Kawasaki called for with that head from the 1984 ZN1100 LTD, and the carbs were slightly different design than the original 1982 BS34 set which is on it.

Not sure if a set of VM33's could net an improvement over the way this engine runs as it is. :unsure:
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Mikuni VM 33 Carbs 12 Mar 2016 06:21 #715068

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I'd follow the recommendations in the FSM but go up one step on the mains and pilots. Other makes had 2/3 richer due to them running hotter than 1/4. You've changed things so finding that "Sweet spot"is going to be a task no matter what carbs you have. I'd get the plug color I want then see if there are adjustable needles of your taper you can use. jetsrus.com/a_jets_by_carburetor_type/needle_selection.html
I thought about changing nozzles and needles but I don't think I have to.
In my case the bike is running pretty good. Flat spots are gone, plugs are clean and a little tweaking I should be there. I just have to live with the drawbacks of a outdated carb system. That is until I can afford modern ones. :unsure:
Steve
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Mikuni VM 33 Carbs 12 Mar 2016 18:38 #715157

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Installed the vacuum "nipples", removed the old funky ones that weren't even drilled the same. :angry: Pics tomorrow. Repositioned the 1/4 and put a set screw in the old holes with JB Weld. I took a punch and crushed the last two threads so they can't work their way in.
Whenever I used the "choke". I'd get some coughing out of the carbs (lean) so I used my jet drills to open them a little. Better now. Raised the float levels a tad too using the clear tube. By the time I had the carbs back on it was getting dark. I'll sync them in the morning.
Steve









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Mikuni VM 33 Carbs 13 Mar 2016 16:21 #715257

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A good argument for syncing the carbs. Though they looked good on the bench, #3 the lead carb was at 30 when the rest were at 19, #4 was at 29. Had to loosen #3 arm on the shaft to make it come down, then tighten it. Not much but enough to throw everything off. Finally got them close enough. I'll put some miles on it to let things settle in, then do it again. No more popping out of the pipe and one cylinder running lean.
The "nipples" :lol: are easy to get to and are a pleasure to use. B)
They're perky. :woohoo:
Steve
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Mikuni VM 33 Carbs 13 Mar 2016 17:50 #715278

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swest wrote: The "nipples" :lol: are easy to get to and are a pleasure to use. B)
They're perky. :woohoo:
Steve


Perky... :whistle:

While you are at it, could you measure something for me?

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Mikuni VM 33 Carbs 13 Mar 2016 18:07 #715279

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3 3.4" approx 4 1/4". Those carbs look good.
Steve







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Mikuni VM 33 Carbs 13 Mar 2016 18:29 #715288

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swest wrote: 3 3.4" approx 4 1/4". Those carbs look good.
Steve


Thanks Steve, your last pic got it. 3.5"

Oh, nice perky's BTW :)
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Mikuni VM 33 Carbs 13 Mar 2016 19:37 #715296

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:lol: :lol:
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Mikuni VM 33 Carbs 14 Mar 2016 19:55 #715447

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You can't really tell by the video, the revs are quicker and it pulls stronger.
Steve
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Mikuni VM 33 Carbs 14 Mar 2016 23:31 #715467

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swest wrote: You can't really tell by the video, the revs are quicker and it pulls stronger.
Steve


Sounds like the juice is flow'n pretty good!

A couple years ago a riding buddy got T-boned by the front wheel of a John Deere farm tractor that the driver had turned to cross the road a split-second after I past him. The guy was driving along in the ditch with the left rear tire just off the pavement when I passed.
I held lane position, but my buddy had to cross the double yellows to avoid running directly into the side of the tractor, and likely would have made it if he'd been riding a Kawasaki instead of a Harley.
I watched the whole event in my 4" left mirror, just to the point where his right forward foot peg exploded at impact. I looked away at that point, and turned around at the next driveway not knowing if he would be alive when I got back there. He was laying flat-out in a grassy field, about 40 feet off the road, and was ok except for the pulverized bones in his right foot, but the Harley was terminated.
That unfortunate situation immediately ended my buddy's riding career, and he didn't get a ticket for crossing the yellows because the tractor driver failed to yield.
My philosophy on riding is that a person can be too careful, but must be able to ride like hell to avoid a problem when only an instant of time is available, and not be afraid to do it.
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Mikuni VM 33 Carbs 15 Mar 2016 05:26 #715472

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I know what you mean. In the wreck the guy I was riding with passed the truck on the right shoulder. I held back until I could pass legally. I saw the driver in his mirror as he pulled over to the right so I dropped down and started to roll it on. He turned left and left me nowhere to go. As it happened I started to avoid him but realized I wasn't going to make it so I put it on it's side and stepped off. That's all I remember. My skid mark was less than 6' long and was a J pattern. It was just on the other side of the double yellow. I got a ticket in the mail for passing in a intersection, lost my licence for a year because I didn't report it within 10 days. I was in the FK'n hospital. 3 illegals in a stake bed truck. :angry:
In this case it's another prick in the car trying to keep me behind him. You'll notice the distance between the cars as they spread out to prevent passing. It happens all the time this time of year. Out of stater's. While the jerk is grinning in his mirror, I grab a handful when I see an opening and go, leaving him in his angry pathetic little world. :evil:
Steve
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