Cafe Racer Forum banner

Good aftermarket carb recomendation? 1981 CB900

19679 Views 10 Replies 5 Participants Last post by  jaguar
Hey everybody,

I picked up a freebee CB900C not too long ago and found that it was in better condition then I thought! The engine turns with no problem, spark seems good, and the rust isnt all that bad. And the electronics also work completely fine! Its like nothing went wrong! The only areas that really need work are the brakes and the carbs. Right now, I've slowly been rebuilding each carb on it and am getting pretty sick of all of the vacuum operation that this thing relies on. Down the road, I'd really like to upgrade to a more simple and higher performance set of carbs.

The bike is an '81 so it has the newer DOHC setup. Are there any decent aftermarket carbs that will go on this thing? And has anybody put a set of cone air filters on them? I'd like to do that too, I really like the look.

Any help is appreciated!
1 - 11 of 11 Posts
This guy put Keihin CR's on his 750:

And K&N pod filters are one of the best options.
Nice! I've heard those carbs are top of the line, but I didn't know you could put em on a 750 or a 900. The keihin website said they'll only fit the cb500's and the cb1100's. If a guy did it with a 750, maybe i could take the one thats meant for the 1100 and retrofit it to my 900? Not sure if it's possible but I would love to have those carbs.
These carbs:

K&N filters only, thanks.

If you don't run some kind of inner rear fender, even quality filters won't stop your motor eating crap and dying.

Danger, is my business.
Wow, that guys setup is pretty much my inspiration. I would love to put thise carbs on my bike. I just want know if the carbs in his picture are the ones I need, or will i need the next size up since this is a 900?
You want to swap carbs so you can run pods? So lame.
but not as lame as putting pods on stock carbs so I guess it's the right move.

check out
they have a million different carb options for the DOHC bikes.
If I was going to swap carbs just for pod filters, it would seem like a total waste of money for me. I really want to swap carbs because I don't like working on the stock ones. The pod filters are a much more lower priority. I just like the way they look and how they make things easier to get my hands on.
If the stock carbs have you wadded that much into a ball you might want to rethink this whole "old bike thing"

The internet is full of people bitching about CV carbs. Most don't know a freaking thing, and are running something stupid.
CV carbs work fine. Easy to set up with the aid of the factory manual.

Changing the carbs will mean you will have to custom tune them to your engine.
Again, if stock is hard you aren't going to like custom.
midway down the page, you want the CR31mms for a 900:


the CV carbs honda fitted to these bikes are absolute shit. I have never felt they worked well and esp on the 900 the throttle response is slow, even when they work perfect. There have been guys who have fitted the smaller cb750C/K/F carbs to the 900F because even though they gave up some top end the carbs got more responsive for mid range city riding. Sure good carbs cost real money, but they are worth it, and Kehin CR's are the best. Seriously, if you want to throw money at the solution - here is the best solution and the best value.

If you want to run stock carbs, don't waste your time with pod filters, K&N makes a replacement air filter for these bikes that fits in the stock airbox. People think the airbox is restrictive but really it isn't, and it is essential for smooth around town running.
Geeto67, thanks. I'll start looking around for some deals on those. I think a guy in our local bike group was selling the one you recomended for my bike. I'll have to check the facebook group again. That'd be sweet if he is.

Jaguar, I checked out, but for some reason the home page wasnt really working well, ill try again later.
You have to register to view the forum there
1 - 11 of 11 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.