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Author Topic: fitting mikuni's on CB450  (Read 2086 times)

Offline schaubster

  • Posts: 178
fitting mikuni's on CB450
« on: Mar 05, 2013, 13:51:57 »
I know you guys have successfully put Mikunis on a Honda CB 450 but I am having some clearance issues.  I bought Mikuni carbs and intake manifold from you guys but when I installed them the top of the carb is hitting a bolt on the valve covers.  How did you guys address this?

Offline mark13018

  • Posts: 811
  • "In the age of information, ignorance is a choice
Re: fitting mikuni's on CB450
« Reply #1 on: Mar 07, 2013, 09:05:24 »
You don't. It does hit. You have to remove the choke levers and it's still tight. If you use the mikuni universal carb boots you'll have slightly less clearance than the factory boots (which you can make work). ALSO the mikuni aftermarket carb boots have a different inside diameter that fits onto the cylinder so you wont get a smooth flow rate for the fuel. The factory boots are tapered from the outside to the back so they have a smooth flow rate... I would suggest NOT using the mikuni carb boots and using factory ones. If your factory ones are bad or you've tossed them already. Partspitstop.com has the cheapest prices on those that I could find. They ship fast too, I've bought from them before several times....
 
   You probably did the same thing I did with mine and now you've spent more money and modified the mikuni carb boots to fit the bolts only to find out the cylinder head and boot inside diameter is two different sizes... I'm picky and I don't like it to be like that so I bought oem ones and use those. That's what my brother did and it works perfect but my boots were hard as rocks so I didn't think they would be as forgiving as my brothers which were still pliable.

Hope this helps.  ;D
need wire for your custom build? Click here!

1971 CL450 cafe "Project Amelia" 
1979 Kawasaki KZ650 "Blue Bessie"
1982 Kawasaki KZ305 CSR belt "Project X"
1995 Honda Magna Deluxe
1987 Honda Super Magna - sold :-(
2006 Honda CBR600RR
1964 CB77 superhawk
1965 CL72 scrambler
2013 honda metropolitan

Offline schaubster

  • Posts: 178
Re: fitting mikuni's on CB450
« Reply #2 on: Mar 07, 2013, 14:53:33 »
Wow Mark!  Really appreciate the advice.
 
The smooth transition from boot to cylinder was also something I noticed.  I wish DCC had made these issues more explicit.  When I bought them it sounded like all I would do is widen the bolt holes a bit and they would fit well.  Of course I didn't realize all these issues until after I drilled them out and can no longer return them.  :-\

Offline mark13018

  • Posts: 811
  • "In the age of information, ignorance is a choice
Re: fitting mikuni's on CB450
« Reply #3 on: Mar 07, 2013, 18:45:00 »
No problem.

I did the same thing. I've had some issues with dime city in the past also with other things too. Overall I'm very happy with them and still buy from them but you have to watch for fitament issues regularly. Good luck on your build.
need wire for your custom build? Click here!

1971 CL450 cafe "Project Amelia" 
1979 Kawasaki KZ650 "Blue Bessie"
1982 Kawasaki KZ305 CSR belt "Project X"
1995 Honda Magna Deluxe
1987 Honda Super Magna - sold :-(
2006 Honda CBR600RR
1964 CB77 superhawk
1965 CL72 scrambler
2013 honda metropolitan

Offline thewingdpiston

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  • Posts: 456
  • DCC - Supporting Whiskey Fueled Mayhem Since 2009.
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Re: fitting mikuni's on CB450
« Reply #4 on: Mar 12, 2013, 15:54:02 »
Hey guys, sorry to hear you've had some issues.  Did either of you contact us directly?  We don't always get the chance to address everything that comes up on a forum as soon as we do if you call us or email us.

On the boots, we updated that verbiage some time ago addressing what you're mentioning above.  In addition, it's common knowledge that not all these parts, though they will fit and work, are direct bolt on.  We do our best to provide as much information as possible and have made a vast array of "kitted" items available that previously were not.

In other-words, we do our best to help with these out of the box types solutions but can't be responsible for every aspect of them.  Hope that makes sense.

Jason
--
Jason Paul Michaels | Dime City Cycles | Vintage Speed Machines

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Offline mark13018

  • Posts: 811
  • "In the age of information, ignorance is a choice
Re: fitting mikuni's on CB450
« Reply #5 on: Mar 14, 2013, 18:20:13 »
PM sent
need wire for your custom build? Click here!

1971 CL450 cafe "Project Amelia" 
1979 Kawasaki KZ650 "Blue Bessie"
1982 Kawasaki KZ305 CSR belt "Project X"
1995 Honda Magna Deluxe
1987 Honda Super Magna - sold :-(
2006 Honda CBR600RR
1964 CB77 superhawk
1965 CL72 scrambler
2013 honda metropolitan

Offline schaubster

  • Posts: 178
Re: fitting mikuni's on CB450
« Reply #6 on: Mar 15, 2013, 13:41:47 »
thewingdpiston -
 
Let me ask you something:  Did you use these intake boots on the 4 CB450 bikes you highlight on your site?

Offline Bick54

  • Posts: 2
Re: fitting mikuni's on CB450
« Reply #7 on: Jan 07, 2017, 00:20:40 »
You don't. It does hit. You have to remove the choke levers and it's still tight. If you use the mikuni universal carb boots you'll have slightly less clearance than the factory boots (which you can make work). ALSO the mikuni aftermarket carb boots have a different inside diameter that fits onto the cylinder so you wont get a smooth flow rate for the fuel. The factory boots are tapered from the outside to the back so they have a smooth flow rate... I would suggest NOT using the mikuni carb boots and using factory ones. If your factory ones are bad or you've tossed them already. Partspitstop.com has the cheapest prices on those that I could find. They ship fast too, I've bought from them before several times....
 
   You probably did the same thing I did with mine and now you've spent more money and modified the mikuni carb boots to fit the bolts only to find out the cylinder head and boot inside diameter is two different sizes... I'm picky and I don't like it to be like that so I bought oem ones and use those. That's what my brother did and it works perfect but my boots were hard as rocks so I didn't think they would be as forgiving as my brothers which were still pliable.

Hope this helps.  ;D


Mark, is there any modification required to get the stock boots to work? I have tried several pairs of boots but my mikunis don't really seem like they go into the boot far enough. Maybe 3/8"...


Sent from my iPhone using Tapatalk

Offline TripleKing

  • Posts: 260
Re: fitting mikuni's on CB450
« Reply #8 on: Jan 14, 2017, 14:55:50 »
Genuine Mikuni manifolds match up to the CB450 ports pretty well. Also, you do not need to remove choke lever or replace with hard to use plungers. On the left side, simply take a Dremel grind away a bit of the choke lever, where it interferes. On the right side, the lever assembly can be rebuilt, without additional parts, to face out on the right side. I have done this and it works fine.

Note: You will have to hog out the manifold stud holes to make them fit properly. Take care  to make sure you do this evenly so the manifold lines up with the port.

Tip: Cut a gasket out of cork gasket material and you will have no air leaks.
« Last Edit: Jan 14, 2017, 15:02:53 by TripleKing »

Offline Slacker

  • Posts: 14
  • Ride Fast. Live Well.
    • Dime City Cycles
Re: fitting mikuni's on CB450
« Reply #9 on: Feb 16, 2017, 23:51:10 »
We've actually been working on this issue for a while now. There's been development of a Mikuni VM32 kit specifically for the 450, just like we have for the 350/360. The billet intake manifolds are sorted, they give the correct angle and push the carbs out enough to allow for all the correct clearances. Now it's just been a matter of sorting out the throttle cable. As opposed to the normal "Universal" cable that requires all the cutting and soldering, we have a manufacturer working specifically on a cable for this setup. That's the last hurdle and then we should have the 450 kits available.... coming soon.

And yes, in the past we have always used the Mikuni boots. We've drilled out the holes a bit for fitment, but then we've always ported to smooth the airflow.

Offline Flugtechnik

  • Posts: 2988
  • My bike is not transportation, it is a respite
    • Nixon and Me
Re: fitting mikuni's on CB450
« Reply #10 on: Feb 17, 2017, 17:48:24 »
Nice.  It looks like they even have pressure taps!  If my rebuilt stock carbs don't play nice this time around, this kit will be high on my wish list.