My Carb Rebuild Experience - part sourcing thread! - Honda Rebel Forum
 
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post #1 of 5 Old 04-13-2016, 04:30 PM Thread Starter
 
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My Carb Rebuild Experience - part sourcing thread!

Well, as we all know 450'S were not exactly produced by many years, resulting on weak aftermarket support for these bikes.

While restoring my carbs, I found that there is no way to find some of the parts necessary to completely rebuild these carbs.

Below is the potpourri of parts I put together in order to get the job done. I hope this helps some of you, out there going through the same situation.

First of all, you have to understand that besides jetting and provision for the accelerator pump, the carbs in the 450 are the same Keihin's used in the NIGHTHAWK, the CB700SC, the CB650, or the cb750. So that right there opens a world of possibilities.
  • As such, I was able to buy carb bowl gaskets on the cheap ( $ 18 bucks ).
  • The second order of business was getting the carb air mix screw o-rings. In this case, the cheapest pair I was able to buy ( $ 6 bucks ) was one fitting an XS650 which fit perfectly.
  • Third hard-part was a bit trickier. My accelerator pump resembled cardboard and I was not able to find an exact replacement. I ended up buying a pump fitting a Honda CM450, ($ 23 bucks)which has the same diaphragm, however it has a shorter shaft. This one took some caressing as I had to carefully grind the end of the old shaft, in order to remove the metal shield which holds the diaphragm in place. I then extracted it from my new part, and hammered (riveted) the old shaft with a tiny chisel in order to hold the retainer back in place. I believe it may be possible to find a similar part with a longer shaft, for it to be cut to size, which would probably be easier, but I was in a rush to buy it and assemble my carbs as soon as possible.... so there you go.
  • Finally, the biggest pain part to find were the o-rings for the fuel pump outlet pipe which is tiny. These rings were a pain to find, until I decided to check z1-enterprises... (I love those guys). They offer the keihin o-rings necessary for this operation for barely any money... AWESOME!
  • The remainder of the job consisted in cleaning my jets, and replacing every other o-ring in the carbs. Do yourself a favor and get a good assortment of viton rings. Trust me... it will pay for itself in the long run.

I hope this helps you guys!
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post #2 of 5 Old 04-13-2016, 05:50 PM
 
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That's actually a common bowl gasket. That's before they made the pump outlet & bowl gasket 1 piece.
Search for the chinese carb kits typically called GY6 or PD24. They'll have most of these parts and either a 24mm or 22mm Vacuum Piston.
You could have probably shortened the rod on the accelerator pump rod and dropped a longer rod on top of it. Good price on that though!
Using your search perimeters that's the first time I found something possibly compatible with the Keihin VE in a search.
Good you found the o-rings for the pump outlet with the size. Might be able to use that and the older bowl gasket (non accelerator pump version) on the 2ng gen rebels as well.

2001 Honda CMX250C 15/30 sprockets
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post #3 of 5 Old 04-13-2016, 10:07 PM
 
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Thank You! This helps a lot.

1986 Honda Rebel 450 28,000 miles
1987 Honda Rebel 450 5,000 miles (sold)
2009 Honda Rebel 250 8,000 miles
1983 Honda CX 650 twisted twin 6,000 miles
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post #4 of 5 Old 04-14-2016, 09:05 AM Thread Starter
 
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Yes... a longer shaft pump would probably save some time and aggravation. I have an OCD personality and didn't feel like shopping around any longer.
These are just my $0.02 anyway... not a guideline, but at least a good place to start.

This one looks like it's long enough to be cut, but the shaft seems to be a bit thicker.. (at least by the picture). I'm looking forward to see if anyone has had any experience with this particular part (ccelerator Pump Kit Honda CB750 CB450 Nighthawk CM450) for future reference...


Quote:
Originally Posted by Bonneville View Post
That's actually a common bowl gasket. That's before they made the pump outlet & bowl gasket 1 piece.
Search for the chinese carb kits typically called GY6 or PD24. They'll have most of these parts and either a 24mm or 22mm Vacuum Piston.
You could have probably shortened the rod on the accelerator pump rod and dropped a longer rod on top of it. Good price on that though!
Using your search perimeters that's the first time I found something possibly compatible with the Keihin VE in a search.
Good you found the o-rings for the pump outlet with the size. Might be able to use that and the older bowl gasket (non accelerator pump version) on the 2ng gen rebels as well.
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post #5 of 5 Old 04-14-2016, 10:02 AM
 
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The part number for what you bought is 18-2807.
Both long and short ones appear in searches. Sometimes with an o-ring and sometimes with the pump cap.
Doesn't make sense...

Here are the Part numbers for the Diaphragm Pump Sets for Rebels
16021-KR3-671 1st Gen
16021-KEN-620 2nd Gen

Hell you can buy complete Keihin carbs from aliexpress for 30 dollars with accelerator pumps.
KEIHIN Cable & Hand Choke PZ30 30mm Carburetor Power Jet Accelerating Pump 200cc 250cc Motorcycle Dirt bike ATV Quad Motocross-in Carburetor from Automobiles & Motorcycles on Aliexpress.com | Alibaba Group
Just rob what you need off of them. Parts prices are ridiculous over here.

2001 Honda CMX250C 15/30 sprockets
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