Mikuni rigid carb holder

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gobium
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Mikuni rigid carb holder

Post by gobium » Sat May 11, 2019 11:02 am

Just made mukuni rigid carb holder.
Left is OME, right was machine by Monkeyuncle .
Resized_20190511_105416.jpeg
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Last edited by gobium on Sat May 11, 2019 3:16 pm, edited 1 time in total.

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jaybird
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Re: Mukuni rigid carb holder

Post by jaybird » Sat May 11, 2019 12:08 pm

Looks like nice work.
I always liked the idea of the extra support those brackets provide, but in all my years and Kilometers of off roading with big feet and oversize boots, I've never had any trouble with knocking off the carburetor, or with leakage. Of course I've never had any trouble with the old style three piece branch pipes either. I've considered welding a piece of thin wall tubing into those brackets, but never needed them, so it's remained just a thought.

Kudos to Monkeysuncle for the nice looking work. :cheers:

Happy trails,
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Re: Mukuni rigid carb holder

Post by INSUBORDINATOR » Sat May 11, 2019 1:06 pm

gobium wrote:
Sat May 11, 2019 11:02 am
Just made mukuni rigid carb holder.
Left is OME, right was machine by Monkeyuncle .
Resized_20190511_105416.jpeg
Am I correct in assuming you also prefer MIKUNIs to KEHIN CVs ? I sure do, Wish I could afford to put Mikunis on mine. I had great results with them on a number of bikes, even my 1994 650 Ural.
Current Motorcycles: Improved 2002 Ural Tourist.

"Be who you are & say what you feel. Those that matter won't mind, those that mind - don't matter."

rougaroo
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Re: Mukuni rigid carb holder

Post by rougaroo » Sat May 11, 2019 2:33 pm

This is the Mikuni compliance fitting he's talking about. Will work with any 32mm carb.

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Albuquralque
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Re: Mikuni rigid carb holder

Post by Albuquralque » Sun May 12, 2019 2:52 pm

Will it work on efi?
"Put a little gravel in your travel"


Previous Urals Owned: 2004 Wolf, 2006 Tourist, 2006 Patrol (TOW), 2006 Patrol (TOM), 2014 Patrol

gobium
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Re: Mikuni rigid carb holder

Post by gobium » Sun May 12, 2019 3:42 pm

Albuquralque wrote:
Sun May 12, 2019 2:52 pm
Will it work on efi?
Absolutely if you have 2019
Two mounting holes
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URAL CT
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Re: Mikuni rigid carb holder

Post by URAL CT » Sun May 12, 2019 9:35 pm

gobium wrote:
Sat May 11, 2019 11:02 am
Just made mukuni rigid carb holder.
Left is OME, right was machine by Monkeyuncle .
Resized_20190511_105416.jpeg
Thanks to gobium...he made me a set way back when (dunno if he remembers 😁). I initially had a set of brackets from an older ural and had a pair of aluminum tubes that I was requesting gobium to weld together for me, instead he made me a set similar to what you see in his picture. l have been using this set-up with the blue silicon tubing carb mount. It has been on my rig for 3+ yrs now (I think)...works real well. The carbs are supported by the solid mounts unlike the stock setup where the carbs are suspended, only held in place by the compliance fitting and the carb/air cleaner hose. Often times the carbs get kicked out of place or does not mount well causing some air leak between the compliance fitting & carb or between the carb & air cleaner hose. I'm surprised that the blue silicone hoses (tubings) have lasted this long without any sign of deterioration. I've not experienced any air leak thus far. BTW, my Ural has the Kehein carbs. If he makes 'em, I recommend you buy a set...works real well with the carburetted models. :mrgreen:
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BinDerSmokDat
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Re: Mikuni rigid carb holder

Post by BinDerSmokDat » Wed May 15, 2019 2:30 pm

I have the stock Keihins, with Mikuni compliance fittings and Raceway perch extensions and three piece branch tubes with Windmill air box (lower, farther forward than stock.)
I too have big feet, long legs and have not kicked a carb off or had problems with air leaks.

That said, having the carbs rigidly supported would be a nice feature, especially when slipping the branch tubes on/off when I've had the air cleaner out.

Count me as +1 for a set if you are making them Van.

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Lmo
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Re: Mikuni rigid carb holder

Post by Lmo » Wed May 15, 2019 2:50 pm

Sure are pretty. Just curious, why are they made in two pieces (as opposed to cut from one piece of aluminum angle)?
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Re: Mikuni rigid carb holder

Post by jaybird » Wed May 15, 2019 3:35 pm

BinDerSmokDat wrote:
Wed May 15, 2019 2:30 pm
I have the stock Keihins, with Mikuni compliance fittings and Raceway perch extensions and three piece branch tubes with Windmill air box (lower, farther forward than stock.)
I too have big feet, long legs and have not kicked a carb off or had problems with air leaks.

That said, having the carbs rigidly supported would be a nice feature, especially when slipping the branch tubes on/off when I've had the air cleaner out.

Count me as +1 for a set if you are making them Van.
So thinking about this a little more, I’m thinking a little give in that area might not be such a bad thing, kind of a shock/vibration absorption.
I think it might be better to have the carburetor knocked off the compliance fitting rather than have something get broken.
At this point I’m not in a hurry to put anything rigid in that position, even if I make it myself.
Not to detract from the makers work though.

Happy trails,
Jaybird
2005 Gear-Up, Mr. Nat_ural 108,000+ Kilometers and counting
2013 Retro, Black beauty, AKA Lucky "13"
1995 Olive Tourist
1975 Enfield Diesel Bullet
2008 Enfield Bullet 500
1974 BMW R 75/6
Etc.

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Re: Mikuni rigid carb holder

Post by gobium » Wed May 15, 2019 4:18 pm

Lmo wrote:
Wed May 15, 2019 2:50 pm
Sure are pretty. Just curious, why are they made in two pieces (as opposed to cut from one piece of aluminum angle)?
May be Bill will chime in.
My guess is that easy to machine flat stocks with cnc vs.
angle stock

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Re: Mikuni rigid carb holder

Post by MonkeysUncle » Thu May 16, 2019 10:02 am

gobium is correct. Also wanted the piece between the head and the carb throat to be a single machined part, required different thickness of material. And trying to reduce the heat transfer from the head to the carb, used teflon spacers between the two pieces. Lastly being cheap, wanted to use material I had in-house. Most of the aluminum used in my work product is plate, bar or round, no angle.
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rougaroo
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Re: Mikuni rigid carb holder

Post by rougaroo » Thu May 16, 2019 10:44 am

Van and I talked a bunch about this early design, and, aside from the support given to the carb if you kick it, one of the other benefits may be preventing failure of the compliance fitting.

The carb is like an end weight vibrating ever-so-slightly up and down as you ride. The weak point in that weight scenario is the compliance fitting. The carb is clamped to the compliance fitting with a ring clamp, so where does the fitting mostly fail? On the head side of the fitting on the other side from the clamp - which is where most of the fitting failures I've seen have been.

With the rigid holder, the compliance fitting doesn't have any lateral weight on it since that is taken up by the holder. The compliance fitting should last until the rubber rots.

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Re: Mikuni rigid carb holder

Post by URAL CT » Thu May 16, 2019 12:59 pm

Here's the current set-up on my 2007 Ural Patrol. There is no compliance fitting to connect the carb to the mount. There is a phenolic spacer between the mount and the cylinder head. I use a piece of silicone tubing secured with a strap clamp to hold the carb to the mount & prevent air leaks. The silicone tubing has been there for almost 3 yrs now with no signs of deterioration. Works for me. Thanks Van! :D
IMG_20190512_204354484.jpg
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Re: Mikuni rigid carb holder

Post by rougaroo » Thu May 16, 2019 2:03 pm

Same exact idea, Charlie. Just isolates the carb from vibration and takes any potential vibration away from the rubber bits.

That looks solid as a battleship -

Rougaroo
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