CB550 Cafe Interceptor - Gentleman's Roadster
- Thread starter FunJimmy
- Start date
FunJimmy
Been Around the Block
Re: CB550F Interceptor
It was suggested on the “High Performance & Racing Forum” on the SOHC4 site, that straight runners from the carbs to the intake valves is a lot more efficient than having bends in the intake tract.
With that in mind, I ordered the CR26 carbs spaced to match the intake ports on the head. That meant I needed to make intake manifolds to mount them. Not having a welder or experience using one, I decided to bolt an adapter to the head and then use rubber intake manifolds from a Kawasaki KZ550.
Here are the adapters rough cut and drilled on the drill press.
It was suggested on the “High Performance & Racing Forum” on the SOHC4 site, that straight runners from the carbs to the intake valves is a lot more efficient than having bends in the intake tract.
With that in mind, I ordered the CR26 carbs spaced to match the intake ports on the head. That meant I needed to make intake manifolds to mount them. Not having a welder or experience using one, I decided to bolt an adapter to the head and then use rubber intake manifolds from a Kawasaki KZ550.
Here are the adapters rough cut and drilled on the drill press.
shiznits75
Revive custom motorcycle fab
Re: CB550F Interceptor
I'm wondering if that setup would boost the performance of the factory carbs? I would love to get a set of CR's but the wallet is a bit light
Do you have any internal mods to the engine? I've read your build on sohc.net but it was a while ago.
I'm wondering if that setup would boost the performance of the factory carbs? I would love to get a set of CR's but the wallet is a bit light
Do you have any internal mods to the engine? I've read your build on sohc.net but it was a while ago.
FunJimmy
Been Around the Block
Re: CB550F Interceptor
Shiznits
Ya, the engine has 59mm Yoshimura pistons with a slight dome so compression will be a bit higher than stock, but I haven’t done the math to quantify it. The head has also been ported and I will be installing a WebCam camshaft too.
You wouldn’t be able to run this manifold setup with the 550 carbs because the stock rack spacing is to narrow, but you could use some KZ Mikuni carbs with this spacing and improve the performance. I was originally planning on using KZ Mikuni carbs and I’ll post a picture of them for you later tonight.
Shiznits
Ya, the engine has 59mm Yoshimura pistons with a slight dome so compression will be a bit higher than stock, but I haven’t done the math to quantify it. The head has also been ported and I will be installing a WebCam camshaft too.
You wouldn’t be able to run this manifold setup with the 550 carbs because the stock rack spacing is to narrow, but you could use some KZ Mikuni carbs with this spacing and improve the performance. I was originally planning on using KZ Mikuni carbs and I’ll post a picture of them for you later tonight.
shiznits75
Revive custom motorcycle fab
Re: CB550F Interceptor
yeah I didn't know if the factory carb spacing could be adjusted some how but definitely post some pics of the mikunis you were going to use. My head is ported and I am running a 650 cam so if I can squeeze some more out with a carb switch, that would be nice.
yeah I didn't know if the factory carb spacing could be adjusted some how but definitely post some pics of the mikunis you were going to use. My head is ported and I am running a 650 cam so if I can squeeze some more out with a carb switch, that would be nice.
Garage_guy_chris
Been Around the Block
Re: CB550F Interceptor
Love the build, great work on everything. The custom fab is awesome. I really like the way you did the front end conversion, and the way you adapted the front wheel hub to suit the front end mods. I want to do a 500/550 build in the not so distant future, gives me ideas...
Love the build, great work on everything. The custom fab is awesome. I really like the way you did the front end conversion, and the way you adapted the front wheel hub to suit the front end mods. I want to do a 500/550 build in the not so distant future, gives me ideas...
CresentSon
Over 1,000 Posts
Re: CB550F Interceptor
That's some fine machining there Jimmy.
That's some fine machining there Jimmy.
shiznits75
Revive custom motorcycle fab
Re: CB550F Interceptor
would the later CV version carbs work as well off of a kz or GS? just curious since they seem to have better throttle response...
would the later CV version carbs work as well off of a kz or GS? just curious since they seem to have better throttle response...
!!!!!! This is Awesome! Great work Jimmy, I want to come learn how to machine parts with you. haha ;D
RustyOlive
Been Around the Block
Re: CB550F Interceptor
AGREED!!!
I have learned so much between you Jimmy and you as well Jens.. your builds are very inspirational.
Jens, your 550 is my focus for my 550..
Jimmy, your detail and information has bailed me out numours times. LOL
keep it up you too! =)
squirley said:
AGREED!!!
I have learned so much between you Jimmy and you as well Jens.. your builds are very inspirational.
Jens, your 550 is my focus for my 550..
Jimmy, your detail and information has bailed me out numours times. LOL
keep it up you too! =)
