Anyone running RS34 Carbs on their DOHC? Or CR31's

[The Menace]

I getting mixed messages, I have an 82 CB750 and I'm running a free flowing exhaust and no air box. I'm having issues with my current set up( won't name names but ), I've been told a few things but the bottom line is before I spend the money. I want to know Mikuni RS34 or Keihin CR31's, do any of you have experience running these on your DOHC CB750?

Theres a bunch of retailers that will say NOT to go with the RS's but I think it might have something to do with the fact they sell CR's!!

Any insight is welcomed.


Thanks

 

[dirtdigger]

Everyone will have there own opinion. The Mikuni RS is more streetable were the Keihin CR series was designed for racing. Both are very tunable and both work well. I have heard nothing but good things about the RS on street motors and are very drivable and tunable. I have heard of some lower rpm drivablity problems in some cases with the CR's but I have no personal at hand information on setups, conditions, etc. I personally would take the RS over the CR for a streetable motor. I know Ken at Cycle X runs a lot of RS's on his bikes, you may want to call and pick his brain on his thoughts and experiences. Once I get the money saved up I will be getting RS carbs for my sohc.

 

[The Menace]

Thanks dirt
Cycle X huh, I was just going to call them this morn but forgot about the long weekend. I was leaning toward RS myself but I was looking for that extra push. I will talk to Cycle X as well, they were the ones I was going to buy of of anyway. Seems poor that a very reputable retailer .... that I'd already spoken with would tank RS carbs so hard. Surprising!

Anyway thanks again

 

[redrider736]

Did you end up going with the Mikuni RS's ??? Looking into them as well for my 79 Cb 750k..... Any advice, help would be greatly apprcieated !!

 

[K2750tracy]

I fully agree with Digger the RS carbs seem to be more streetable than the CR's. Either will be a 110 percent improvement over the cv carbs that come on the DOHC engines. I too am saving for a set of RS's for my SOHC build.

 

[redrider736]

I wanted to run a Twin Mikuni VM34mm set-up, but have been told it won't work on a stock DOHC frame
Are the RS's meant for a stock 750 motor ?? Is it tooo much Carb ?? If I decided down the road to do a Big Bore mod would the RS's be able to adapt with my future upgrades ?

 

[Hippie459MN]

I wanted to run a Twin Mikuni VM34mm set-up, but have been told it won't work on a stock DOHC frame
Are the RS's meant for a stock 750 motor ?? Is it tooo much Carb ?? If I decided down the road to do a Big Bore mod would the RS's be able to adapt with my future upgrades ?

I dont know how stock this frame is and dont have much details on the bike other then I heard it runs like a champ! Im looking at doing this twin carb set up on my 79 DOHC this winter hopefully and hopefully it works. lol

 

[redrider736]

I dont know how stock this frame is and dont have much details on the bike other then I heard it runs like a champ! Im looking at doing this twin carb set up on my 79 DOHC this winter hopefully and hopefully it works. lol

That's the same set-up I have seen with Cycle-x intake.


Found this site that has the same Twin set-up but the VM's tuck inward into the DOHC frame with not Mod's needed !
http://www.speedmotoco.com/cb750-DOHC-vm34-dual-carb-Mikuni-complete-kit-car-p/km-vm34-dohc.htm