Keihin Flat Slides

[JohnnyTheCraneGuy]

Does anyone have any recommendations with Keihins? I'm looking at acquiring a pair that I could use when I swap to the bigger pistons and maybe cams. Another reason too is I'vw seen them come up on facebook here and there for a Y\FZR750, a kehins FCR39. But from what FJ1289 was telling me, those are set up for downdraft rather than side. Another was listed as a CR31-3051 for hondas CBFs, I messaged the owner and he said they were down draft as well, so I am scratching my head a little bit here.

If anyone has experience with this and could share the specific models I would need, that would be a huge help for me.

[red]

Johnny,

Can't help with specifics, but I would send Keihin an email direct, and see what they advise.  Website:
Keihin

[JohnnyTheCraneGuy]

Right on Red, thank you sir!

[Pat Conlon]

77-85-77 is the carb spacing you want to fit our FJ's.

The Mikuni TMR36 or 38's roller flat slides have a choke for cold starts
https://www.bikeside.de/MIKUNI-TMR38-flat-slide-carburetor-for-all-KAWASAKI-GPZ-900-R-GPZ-1000-RX-and-YAMAHA-FJ1100-1200



The more expensive Keihin FCR39 roller flat slides do not have a choke.
https://www.bikeside.de/KEIHIN-FCR39-flat-slide-carburetor-for-all-GPZ-900-R-GPZ-1000-RX-ZR-1100-Zephyr-and-FJ-1100-FJ-1200




 

[Bozo]

If you are on a budget I bought a set of 2000 model 37mm FZ1 carbies for my FJ with some engine works, they fit direct just require jets. They have bell mouths and a much better setup than the standard carbies. Depends on the day I got mine for A$250 delivered - BARGAIN.

A huge improvement on the standard

[Pat Conlon]

If you are on a budget I bought a set of 2000 model 37mm FZ1 carbies for my FJ with some engine works, they fit direct just require jets. They have bell mouths and a much better setup than the standard carbies. Depends on the day I got mine for A$250 delivered - BARGAIN.

A huge improvement on the standard

Thanks for the tip....IMO for a street bike, CV carbs are the way to go.
My 1380 struggles on the top end with my oem 36mm FJ CV carbs, so I'm always looking for a bigger carb for better top end airflow. A 37mm carb should help.

A couple of Q's
The FZ1 cylinders are spaced different than the FJ, so how did you get the FZ1 carbs spaced out to 77-85-77?
How did the throttle shafts mate up or did you have to use the FJ throttle shafts?
Are there any write up's or posts on this mod?
I see several US eBay listings for 2001-2005 FZ1 carbs, but none for the 2000 year, any differences?
Example: https://www.ebay.com/itm/265996536368
Is there a difference in the sizes between the Australian FZ1 carbs and the US models?
I wouldn't surprise me if the US models were choked down to 36mm.

Thanks again.

Pat