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TOPIC: Mikuni VM 33 Carbs

Mikuni VM 33 Carbs 17 Nov 2016 18:58 #748190

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:huh: What difference does lowering the fuel levels make?
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Mikuni VM 33 Carbs 17 Nov 2016 20:18 #748194

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Leans out the mixture.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 18 Nov 2016 03:23 #748205

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daveo wrote: :huh: What difference does lowering the fuel levels make?


The carb is designed to best perform with a certain specified level of fuel inside the float bowl.
A too high fuel level results in an excessively rich mixture throughout the throttle range.
A too low fuel level results in an excessively lean mixture throughout the throttle range.

Here's a link to a fairly comprehensive thread regarding 33 smoothies:
Click > www.kzrider.com/forum/3-carburetor/16281...?limitstart=0#162815

Good Fortune! :)
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Last edit: by Patton.

Mikuni VM 33 Carbs 18 Nov 2016 06:27 #748217

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Patton wrote:

daveo wrote: :huh: What difference does lowering the fuel levels make?


The carb is designed to best perform with a certain specified level of fuel inside the float bowl.
A too high fuel level results in an excessively rich mixture throughout the throttle range.
A too low fuel level results in an excessively lean mixture throughout the throttle range.

Here's a link to a fairly comprehensive thread regarding 33 smoothies:
Click > www.kzrider.com/forum/3-carburetor/16281...?limitstart=0#162815

Good Fortune! :)


Very interesting but he is asking about his flat slides. My 33's are set up differently but I'll read on and maybe learn something. :whistle:
Steve
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Mikuni VM 33 Carbs 18 Nov 2016 14:23 #748248

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I set the floats at 17 mm +/- 1 mm per Mikuni Flatslide instructions, as I imagine most folks do. :whistle:
Would think there would be clear-tube method instructions somewhere for these carbs, but I have not been able to find any. :evil:

Any leads?
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Mikuni VM 33 Carbs 18 Nov 2016 16:11 #748262

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I would check them all with the clear tube to see if they are all the same.
Steve
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Mikuni VM 33 Carbs 19 Nov 2016 15:25 #748377

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Just had our first cold day with snow. Perhaps another few rides before its over for another season here.
Thanks Steve, I'll check that...the last time was a few months ago.
Just curious, have you ever considered getting a set of the Flat Slide carbs for your 900?
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Mikuni VM 33 Carbs 19 Nov 2016 20:15 #748404

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It's a 1015 with cams and such. I've thought about it but would rather invest in other improvements first.
Steve
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Mikuni VM 33 Carbs 19 Nov 2016 21:39 #748410

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I went the RS36, though other members suggested the RS34 would be the better size for my engine. Thought about getting a used set to test, then keep whichever set works better.

The fuel levels were very-close across the set.

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Last edit: by daveo. Reason: Revise text and change pic

Mikuni VM 33 Carbs 22 Nov 2016 07:57 #748666

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daveo wrote: I went the RS36, though other members suggested the RS34 would be the better size for my engine. Thought about getting a used set to test, then keep whichever set works better.

The fuel levels were very-close across the set.



Can't help it...I did it again. :pinch: One PO set of RS34-D21-K will surely arrive the day we get blasted with snow. :lol:
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Mikuni VM 33 Carbs 25 Nov 2016 19:02 #748929

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Reading that thread saying the 33's are slow at low RPM got me to take this clip. Slow?
Steve
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Mikuni VM 33 Carbs 28 Nov 2016 20:10 #749135

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Rather than starting a new thread I decided to put it here. May have to tweak the carbs so it will rev better.
Steve
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Mikuni VM 33 Carbs 30 Nov 2016 06:31 #749169

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Works great. The bike is more aggressive and pulls away quicker. Only problem is the grip started turning. The cable is too long so it has too much drag. I have a shorter one I took off. I might send this one back to the eBay seller with a note. :evil: I bought it as a spare so when I found it was too long, it was too late. :angry: I check everything I buy now as soon as I get it. Most are good people but there are some that aren't. Buyer beware.
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Mikuni VM 33 Carbs 30 Nov 2016 17:44 #749205

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The cable is SIX INCHES longer. :angry: Got the carbs off and will check the float levels in the morning. Going for a ride tomorrow to the high desert again and will stop by Chaparral for a new face shield. Getting too cold to ride without one. B)
Steve
BTW, if anyone needs a extra long throttle cable, I'll let you have it cheap. Still in good shape but it's too Flipping LONG. :angry: :angry: :woohoo:
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Mikuni VM 33 Carbs 01 Dec 2016 08:35 #749235

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Cable?
How's the float levels...do you check them using the clear-tube method?

My new/used RS34's developed a consistent drip off the drain on #1 carb bowl when the bike is resting on the side-stand, so I need to check into cause of that. It is either the fuel-valve O-ring isn't sealing, or may need to adjust the float heights from 17 mm to 18 mm +.

I noticed some scale deposits on the O-ring surface of the fuel-valve bores, and maybe I didn't clean that up well enough.
The clear-tube level check showed the #1 carb fuel is higher than the RS36's, which may be the culprit. Whatever, I should be able to rule out if its the O-ring if there is no fuel still dripping when the bike is vertical, sitting on the center-stand.

Runs better with 34's...
:)

Update : No fuel dripping while vertically positioned on the center-stand for a day, so apparently the float heights need adjusting.
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Last edit: by daveo. Reason: update

Mikuni VM 33 Carbs 01 Dec 2016 09:30 #749238

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Found one of the long nipples was cracked. Cut and rethreaded it. Going on a ride and will check everything out more when I get back.
Steve
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Mikuni VM 33 Carbs 01 Dec 2016 18:47 #749260

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Changing the cable made a lot of difference. Throttle much easier. I can tell it's lean just off idle. When I get home I'll raise the needles one notch. The bike runs great otherwise. :woohoo:
A flipping cold ride so I stopped at Chaparral for a face shield and some warm gloves. The shield I had before I'd carry in a side box. I lost it one time when I forgot to latch it. I found it but it happened again and it was gone for good. :( Why I had it in the box during the summer was just plain STUPID. :angry: Anyway this helmet has other attachments like a LED brake light in the back of the helmet. Really cool.
www.chaparral-racing.com/product/gmax-gm...kit/131-72-3567.aspx
I also ordered a jaw set for cold weather riding. I'll have it in a few days. $15 :)








With the face shield and gloves it was a lot warmer. Cold ride tomorrow and I'll be ready. B)
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Last edit: by SWest.

Mikuni VM 33 Carbs 03 Dec 2016 20:49 #749401

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The throttle is working much better..
Steve
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Mikuni VM 33 Carbs 03 Dec 2016 23:21 #749404

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swest wrote: The throttle is working much better..
Steve


YOWZA dude! :woohoo:
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Mikuni VM 33 Carbs 02 Jan 2017 10:06 #751163

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I hope I am not highjacking here, but I am curious about whether or not there is much of a market for VM33's. I've read through this whole thread, and get the feel that at least Steve is having success with them.

I mainly ask because I seem to have inherited a set with a parts 650 I picked up a couple of months ago. As soon as I can get it organized, I will post some photos, to confirm what they are. I reckon somebody else can let me know if I have it wrong anyway.

The plan had been just to tidy them up for sale, as they are far too big for any of my bikes, and it seems they have some intrinsic value. If the OP was suggesting they can be worth $250-300 USD, then it is worth the time to clean them up and sell them off. (Or, as always for fair prize to a fellow KZer.)

Pics soon,

Cheers,
Jon
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St. Catharines, ON (Mostly, anyway...)

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