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Discussion Starter · #21 · (Edited)
I Don't know if these still exist, or if they really work but this is for the stock 450 carbs, let me know what you guys think.


Good News on Carb Boots or Insulators or Holders
Good try and there is nothing wrong with trying. Unfortunately no they will not work on the CMX450 intake manifolds (insulators) these are a bread all there own, there is even a right and a left manifold. The CMX450 manifold in not interchangeable with any known motorcycle, not any of the CB models nor any of the CM models, and to make things even more difficult the intake port on the cylinder head is not center of the bolt holes. Thank the engineers for that one!
 

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Hi I got redirect on your post by another Rebel guy since I have the idea to install 2 Mikuni on my Rebel 450 as well. Anyhow I will install 2 external conical air filter, the orignal air box is gone!!!!
you did a very good job and I will keep posted on how mine is going
 

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I have been experimenting with a set of 30mm VM round slide Mikuni carburetors along with a set of 32mm VM round slide Mikuni carbs and I really can not tell any difference between the two sets. I am also well pleased with them as they keep the fuel ratio the same from one ride to the next and from one day to the next and from one week to the next. Both sets have be turned or machined to fit the Rebels stock insulators (carburetor mounts) and stock air box. I am not trying to convince anyone that these carbs are the answer to all your prays for they are not. These cars do not have an accelerator pump so the throttle needs to be rolled open rather than snapped open, the enricher (the choke) is an on – off affair which has not bothered me at all but can't be run in any part choke position but can be cable operated from the original choke lever. If you can live with these attributes then you will most likely enjoy any of these carburetors for they start well, idle well, have good throttle response, and are much lighter on the insulators. I will defiantly be running a set of Mikuni carbs on my Rebel 450 as I have been doing for over 2,000 miles now, because I just had to gave up on trying to get the stock carburetors to have any kind of consistency even after having three sets of the stock carbs. So either set of these Mikuni carbs are for sale. Pm (personal message) if interested
Hello old school I have an 86 Honda 450 Rebel and have just bought one set of stock carburetors let the dealer ruin so I took my original carburetors that were running to them to have them cleaned and they ruined those and started thinking about trying to do the Mikuni carburetor swap if it's not too much trouble for me to do as I am not a builder please advise me on the steps in trouble that I am facing
 

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Hello old school I have an 86 Honda 450 Rebel and have just bought one set of stock carburetors let the dealer ruin so I took my original carburetors that were running to them to have them cleaned and they ruined those and started thinking about trying to do the Mikuni carburetor swap if it's not too much trouble for me to do as I am not a builder please advise me on the steps in trouble that I am facing
You may not get a reply from Old School as he hasn't signed onto the forum since 2016 three months after he listed 450 for sale..
 

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I have been experimenting with a set of 30mm VM round slide Mikuni carburetors along with a set of 32mm VM round slide Mikuni carbs and I really can not tell any difference between the two sets. I am also well pleased with them as they keep the fuel ratio the same from one ride to the next and from one day to the next and from one week to the next. Both sets have be turned or machined to fit the Rebels stock insulators (carburetor mounts) and stock air box. I am not trying to convince anyone that these carbs are the answer to all your prays for they are not. These cars do not have an accelerator pump so the throttle needs to be rolled open rather than snapped open, the enricher (the choke) is an on – off affair which has not bothered me at all but can't be run in any part choke position but can be cable operated from the original choke lever. If you can live with these attributes then you will most likely enjoy any of these carburetors for they start well, idle well, have good throttle response, and are much lighter on the insulators. I will defiantly be running a set of Mikuni carbs on my Rebel 450 as I have been doing for over 2,000 miles now, because I just had to gave up on trying to get the stock carburetors to have any kind of consistency even after having three sets of the stock carbs. So either set of these Mikuni carbs are for sale. Pm (personal message) if interested
If you are planing on running the VM round slide 30mm Mikuni carburetors on the stock 450 Rebel insulator (intake manifold) the intake end of the carburetor needs to be turned or machined down to 1.495 so it will go inside the intake manifold. If the stock air box and boots are to be used then the bell end of the carburetor needs to be turned or machined down to 2.177 to except an extension sleeve that needs to be made. This extension sleeve will need to be 2.130 O.D. 2.075 I.D. and .700 long. A rubber coupler will go over the bell end of the carb and the extension sleeve.


Jetting for the VM 30mm - jetting is for 100 ft. above sea level - The 30mm will come in Left hand idle only.


120 –----- Main Jet
25 –-------Pilot Jet
6F4 –------Needle (e-ring clip set in #2 notch)
2.0 –------Air Jet
159 0-2 --Needle Jet (emulsion tube)
2.5 –------Throttle Valve (slide) 33 –-------Needle and seat
air screw 1 ½ turns out from lightly seated


Do yourself a big favor – Sudco.com or Dime City Cycle.com can send you carburetors with this jetting and so can I. I can also do all the machine work, extension sleeves, and rubber couplers.
Just bought an 86 450 and realized the predicament. Your post is very old. Are you still involved in this issue and can supply the carbs and modded sleeves?
If you are planing on running the VM round slide 30mm Mikuni carburetors on the stock 450 Rebel insulator (intake manifold) the intake end of the carburetor needs to be turned or machined down to 1.495 so it will go inside the intake manifold. If the stock air box and boots are to be used then the bell end of the carburetor needs to be turned or machined down to 2.177 to except an extension sleeve that needs to be made. This extension sleeve will need to be 2.130 O.D. 2.075 I.D. and .700 long. A rubber coupler will go over the bell end of the carb and the extension sleeve.


Jetting for the VM 30mm - jetting is for 100 ft. above sea level - The 30mm will come in Left hand idle only.


120 –----- Main Jet
25 –-------Pilot Jet
6F4 –------Needle (e-ring clip set in #2 notch)
2.0 –------Air Jet
159 0-2 --Needle Jet (emulsion tube)
2.5 –------Throttle Valve (slide) 33 –-------Needle and seat
air screw 1 ½ turns out from lightly seated


Do yourself a big favor – Sudco.com or Dime City Cycle.com can send you carburetors with this jetting and so can I. I can also do all the machine work, extension sleeves, and rubber couplers.
[/QUOT
This is a pretty old post. Are you still involved in this issue and supplying the carbs and mods? Thanks. Kyle
 

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If you are planing on running the VM round slide 30mm Mikuni carburetors on the stock 450 Rebel insulator (intake manifold) the intake end of the carburetor needs to be turned or machined down to 1.495 so it will go inside the intake manifold. If the stock air box and boots are to be used then the bell end of the carburetor needs to be turned or machined down to 2.177 to except an extension sleeve that needs to be made. This extension sleeve will need to be 2.130 O.D. 2.075 I.D. and .700 long. A rubber coupler will go over the bell end of the carb and the extension sleeve.


Jetting for the VM 30mm - jetting is for 100 ft. above sea level - The 30mm will come in Left hand idle only.


120 –----- Main Jet
25 –-------Pilot Jet
6F4 –------Needle (e-ring clip set in #2 notch)
2.0 –------Air Jet
159 0-2 --Needle Jet (emulsion tube)
2.5 –------Throttle Valve (slide) 33 –-------Needle and seat
air screw 1 ½ turns out from lightly seated


Do yourself a big favor – Sudco.com or Dime City Cycle.com can send you carburetors with this jetting and so can I. I can also do all the machine work, extension sleeves, and rubber couplers.
This is a really old post. Are you still involved with this issue? Kyle
 

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If you are planing on running the VM round slide 30mm Mikuni carburetors on the stock 450 Rebel insulator (intake manifold) the intake end of the carburetor needs to be turned or machined down to 1.495 so it will go inside the intake manifold. If the stock air box and boots are to be used then the bell end of the carburetor needs to be turned or machined down to 2.177 to except an extension sleeve that needs to be made. This extension sleeve will need to be 2.130 O.D. 2.075 I.D. and .700 long. A rubber coupler will go over the bell end of the carb and the extension sleeve.


Jetting for the VM 30mm - jetting is for 100 ft. above sea level - The 30mm will come in Left hand idle only.


120 –----- Main Jet
25 –-------Pilot Jet
6F4 –------Needle (e-ring clip set in #2 notch)
2.0 –------Air Jet
159 0-2 --Needle Jet (emulsion tube)
2.5 –------Throttle Valve (slide) 33 –-------Needle and seat
air screw 1 ½ turns out from lightly seated


Do yourself a big favor – Sudco.com or Dime City Cycle.com can send you carburetors with this jetting and so can I. I can also do all the machine work, extension sleeves, and rubber couplers.
So what is the cost of these 30mm carbs?
 

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Siento no poder hablar vuestro idioma, espero que el traductor haga su trabajo, solo comentaros que los carburadores son unos PWK de compuerta plana de 32mm y ajustan en las botas originales de la motocicleta, no se como funcionan todabia los monte anoche pero di una pequeña vuelta y parece q todo va bien, mucha más fuerza y respuesta pero como os digo me falta ajustar y colocar el filtro
 

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1985, 86 CMX250C, 81 CM200T, 74 CL360, Invisible to cages, treat them accordingly. Avoids Road RAGE!
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Hello everyone, delighted to be with you, I am from Spain and I have a honda rebel 450 to which I have inhaled some PWK32, the most complicated thing has been the accelerator cable, I still need to put the filter box and adjust the carburetion, left a video I know how it goes

I'm sorry I can't speak your language, I hope the translator does his job, just to tell you that the carburetors are 32mm flat-gate PWKs and they fit on the original boots of the motorcycle, I don't know how they work, I still mounted them last night but I gave a little back and it seems that everything is going well, much more strength and response but as I say I still need to adjust and place the filter

Welcome Malp81 .
Unfortunately I don't understand what looks to me like Spanish. Would you please use a translation service similar to Google translate like I did to edit your posts? This site is English language only, as I found out using Hungarian.
 

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hello again (now translated😁) I was telling you that I have installed two 32mm PWK in my honda rebel 450, I just mounted the original air filter with a provisional invention to be able to test them, it seems to be going well, the jets are 115 of high and 40 low, I have to test it well but it seems that it will be fine. greetings to all
 

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Welcome to the forum. The translator seems to be working well. Much better than my limited understanding of Espanol (don't know how to print an enye).
 

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Thanks everyone, I have a question about the throttle cable.
the cable is from 1 to 2 cables, in Y, I would like to know and those who already have the kit assembled can answer me, it is the length of the cable, which measures the accelerator cable to the distributor and the two that come out to the carburetors. Thanks in advance
 

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Hi, I'm carbureting the bike, it's getting better every time, I still have a small bump when accelerating very slowly that sometimes stops the engine.
I'm using #30 low and #115 high, one spark plug comes out whiter than the other, any opinions and advice?
 
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