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It's been quite a few years, but I think I got mine from the Motion Pro catalog through my local independent shop. Works on quite a few different Honda models so it is probably still available.
Glad to be of help. My current ride is an '81 CB400T and prior to that I had an '83 CM450 which I rode for many years (it's now a really slow back burner cafe project) so I know how hard it is to find much info on this series and try to help when I can.
'81 and up models of the CB/CM400 and 450 all used the 30mm CV Keihin with slightly different jetting between models. The exception to this were the automatics which used 28mm carbs. They are about as close to plug and play as you are liable to get because you might even get away with not...
The CB/CM400-450 used the motor as part of the frame so your easiest route would be to drop in a motor from that family. I think all the different models use the same mounting points except maybe for the trellis frame model they put out in 87 (I think) for a year or two.
In any case you're...
Yup, my dealer usually has a couple in stock because that filter was used on a lot of different bikes for quite a few years. It also comes with the O-rings, something at least some of the after market ones lack.
I really couldn't tell you how well different carb/motor combinations would work out. My Haynes manual lists carb model codes for 1980-83 in it. Looks like it should be a VB22 of some sort if the carbs match the motor. You can find the code stamped on the the carb but I forget where, on the side...
Thanks for the info.
I'm toying with the idea of putting them on a CM450 in place of the usual lean running 30mm CV's (which Honda stepped down to from 32mm on their 400's to keep the EPA happy). It certainly sounds like they would have enough extra capacity for the few extra ponies I might be...
An aluminum frypan would probably work if you removed any coating on it.* It might even work with the coating, I don't know, but I wouldn't chance it.**
*I'm not responsible for any acts of domestic violence as a result of choosing a spouses favorite pan.
**Who am I kidding, I probably would...
A good heat sink under the piece will help by letting the weld cool faster. You can use steel, but you might end up sticking to it which can be damn annoying. A dissimilar metal (i.e. copper, brass or aluminum) backing plate allows you to get away with a lot because you can smack the pieces...
The motors are largely identical although it depends on the year. Prior to 1980, the carbs (both models had dual carbs) were 32mm. In 1980 it was dropped 30mm as part of a re-design that included the combustion chamber and keeping the EPA happy. In 1982 the bore was enlarged to make it a 450 but...
Here's a 'ound for ya. This is Sally, my goofy old Beagle.
My girls and I being silly.
They have pretty much grown up together. Sally was about one when my daughter was was born, and my daughter is almost five now. Guess which one still likes being called my baby girl?
You don't need a tri-mix. Argon with low O2 or CO2 (i.e. somewhere around the 2% range) works quite well. Avesta Welding actually recommends it over the triple mix for 304 and similar steels.
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