Mikuni carb

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hi I have a friend that would like to fit a single Mikuni to his N15 1967, his worry is the clearance at the top of carb for throttle cable etc. has anybody done this please and how did it work out. thanks Nimrod
 
I have heard of this being done successfully but have no first hand experience. A 90 degree cable adjuster will buy him some clearance.
 
hi I have a friend that would like to fit a single Mikuni to his N15 1967, his worry is the clearance at the top of carb for throttle cable etc. has anybody done this please and how did it work out. thanks Nimrod
Dear Nimrod; Over the last fifty something years I have only seen two effective single carb. conversions. One involved cutting a piece out of the top tube and welding in a plate to cover the hole and return some strength to the top frame. This was on a desert racer from the 60s. The other dodge was to use a tt10 carb. and a remote float. Mark
 
I have done this as I like Mikuni carbs. It is very tight. It is best to remove the right angle tube guide and just have the cable coming out of the top. Also just cant carb a few degrees to the right. Works fine for me.
 
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I'm not sure if all VM carb tops are the same
But what I have done in the past is cut off the threaded portion and drill out the thread to fit a ferrule instead of the threaded adjuster
This gains quite a lot of clearance
 
I'm not sure if all VM carb tops are the same
But what I have done in the past is cut off the threaded portion and drill out the thread to fit a ferrule instead of the threaded adjuster
This gains quite a lot of clearance
I have also done that. I know that the tops of some Mikunis are unthreaded and the fittings which correspond to those carbs are retained by a circlip on the inside of the carb top. I have drilled out the threads in threaded tops, cut the top down until the upper surface is flat, and adapted them to suit a circlip retained fitting. All to clear awkwardly placed frame tubes or awkwardly routed 2 stroke exhaust.
 
The next question is how to hold the outer cable so the inner cable can move in and out and raise/lower the slide. Just two weeks ago I encountered the same problem on a Trackmaster frame...fortunately I have a lathe. I cut the top flat and drilled out the threads. I made a ferrule out of steel and drilled it just big enough to get the cable fitting through it. I cut as big a radius on the ferrule as I could so the inner cable would have as gentle a curve as possible to go over. Then I made a bracket using 1/4 alu plate using the two bolts that mount the rubber flange. It goes upward as high as I could go, parallels the top frame tube, then drilled/tapped it for the standard Mikuni cable adjuster. This hole also needs a slot so the cable can be lifted out whenever needed. It is easy to remove and adjust the cable. Then I made my own cable. Best I could do.
 
I have done this as I like Mikuni carbs. It is very tight. It is best to remove the right angle tube guide and just have the cable coming out of the top. Also just cant carb a few degrees to the right. Works fine for me.
Wow timely question. Yes Gilesy - canting the carb is seems the best idea, I almost went for an angled fitting but thought hmm, try just offsetting a bit. Here's mine, showing just enough to clear the frame. It works on mine in practice, not ridden yet but I have put tank on and seems OK.

I found a more difficult problem with figuring out an air filter - very tight, like 1" back there. I have squashed a Uni filter in for now. Not sure what other options there are. At least it was only $20 and should work and won't be visible. Here ae pics of my 'bodge'. Recently saw an 850 engine in an N15 frame on FB, and the forward canted engine solved the problem haha.

Sensitive souls please avert your eyes :eek:

Mikuni carb


Mikuni carb
 
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