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Boring out my 26mm mikuni carbs to 29mm

  • Thread starter Thread starter Warren
  • Start date Start date
The reason why you have to machine the recess for the slide is because otherwise the slide cutaway will be too high. You can get around this in 3 ways.. 1) machine the recess deeper by 1mm. 2) machine off the bottom of the slide and reshape the cutaway, or 3) buy new slides with higher cutaways.

I have researched this mod extensively and concluded it is financially not worth it as you can buy 28's easily and cheaply and they do the same job, or for slightly more money you can buy the VM29SS flatslides and easily bore those out to 33's if you wish.

By the way, the 28's are only 26's bored out at the factory anyway.....
 
What did the vm28mm come stock on? I've have yet seen these carbs. I have searched these on eBay and there are no carbs in this size for 4 strock engines. Am I missing something?
 
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I don't think these carbs are easily available in North America. If they were I'm sure the 28mm would be the best option as you stated.
 
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The way I read it was that the "alternative" to machining them would to just simply buy a set of factory 29s. What they are saying is that its just easier to buy new 29s and that the mod is actually very compataile to stock 29s.

Also, i thought it said the 29s ( and this mod ) would provide an INCREASE of around 3 miles per gallon in mileage.
 
Today I started cleaning my 26mm carb bodies and would like to know if the brass insert where the needle goes through into the main jet, is this pressed in or threaded? I will need to remove this before machining and I do not want to damage it.
 
Press fitted and the emulsion tube holds it up there. gently use the end of a tooth brush handle and tap it out the bottom. By the way, thats the air jet. Look at it closly. Some have the back side cut away. Be sure of how they are set in before removing.
 
if they dont move rather easily, then give them a little heat from a heat gun to expand the carb body a little and they will slide out better.
 
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