[tbpmusic]

Can't remember exactly who it was that was trying to use 450 carbs on a 350.
Here's a bit of info that may help renew your interest.

As I recall, the problem was that the carbs ended up running into the frame tube??

I was just in the shop and discovered that the CB400 Twin carb manifolds (from the later SOHC twins) fit nicely on the older 450 DOHC carbs, and they have a slight "angle" or tilt to them, which may be enough to allow them to clear your 350 frame downtube. Probably the same part as the 450 SOHC twins and Hawks, too.

 

[woody1981]

IT WAS ME!!! Oh man, Mr. Lane... you just made my day!!!

I'm all over it... anyone have any of those manifold? I'm going to ebay right now!!!!

- Woody

 

[tbpmusic]

Don't get dangerously excited now - all I know for sure is that they seem to fit on 450 carbs ok.
Not sure how well they'll fit up to a 350 head - I don't have one to try on.

Let me poke around tomorrow and see if I can find both of them out there in that mess I call a shop.

 

[woody1981]

Cool... thanks!! If you can we could just call it a trade ;-)

- Woody

 

[oldskool]

Hey Woody, Im trying the same thing with the 450 carbs on my 73 CL350. The maintenance man at my work has a CB350 with 450 carbs and Ill find out exactly how they go on. He purchased the bike like that so Im gonna have to poke around his bike a little, but I will find out how to make it work.

 

[woody1981]

That would be awesome Scott. The boots I got from Bill look pretty good... but I don't know if they are going to have enough angle to clear. I haven't had time to mess with it much right now, and I also know that I need to get a throttle cable off a 450, cause the cable off the 350, even with everything as loose as it will go still holds the 450 carbs open.

Let me know what you find out.

- Woody

 

[oldskool]

I got him to send me some pics of his setup and it looks like he is just running the carbs straight off a 450 intake. I asked him if his running an airfilter and he said he's using the stock one.

 

[oldskool]

Hey Woody, I might be on to something with the 450 carbs. I took off the choke bracket that connects the two carbs together, and I trimmed approx. 1/4'' off the shafts that the choke valve rests on. Im going to attempt to install this wkend so I'll keep you posted. My buddies 350 w/ the 450 carbs is only using 1 choke! It fires up everytime. Oh yeah did you end up rejetting your 450's?