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Author Topic: Getting a new carb for CB750dohc  (Read 657 times)

Offline enterlance

  • Posts: 62
Getting a new carb for CB750dohc
« on: Nov 19, 2018, 23:32:57 »
Hi guys, I have a question for my project, a 1980 CB750F dohc.
When I first bought the bike, it came with the stock CV carbs and a set of 4 K&N air pods. I know they don't go alone so I'm thinking of getting the Cognitomoto airbox.

Yesterday, I went to the Motorcycle show in Long Beach, CA. Talked to a Japanese motorcycle customization company (I speak Japanese) and saw their masterpiece - a great restored and tuned up Kawasaki Z1. And suddenly, I came up this idea: Why would not just get a new carb?

After some research, I decide either go for the JB power CR carb (https://japan.webike.net/products/2053888.html) or Kelhin CR carb (https://japan.webike.net/products/1902634.html), they don't have to have air filter/box/pods (though you might have to clean the carbs more frequently) so I can save on the $220 Cognitomoto airbox, and don't have to deal with tuning the CV carb pain.

My question is, what is so special of CR carbs? (Forgive me for ignorance) Have anyone tried putting those carbs on a dohc CB750? How do you think my decision and if you have any other ideas for me could you please share me your wisdom?

Many thanks!!

Offline cxman

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Re: Getting a new carb for CB750dohc
« Reply #1 on: Nov 20, 2018, 08:40:26 »
what kind of driving do you intend on doing ?

how familiar are you with tuning and jetting carbs or do you want a plug and play soloution
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline cb360j

  • Posts: 363
Re: Getting a new carb for CB750dohc
« Reply #2 on: Nov 20, 2018, 10:10:49 »
http://www.dotheton.com/forum/index.php?topic=74688.0

This bike build he went with a dual carb setup instead, apparently it runs darn well. Might skim through this and check out what he has

Offline enterlance

  • Posts: 62
Re: Getting a new carb for CB750dohc
« Reply #3 on: Nov 20, 2018, 15:46:10 »
Let's say I have little to None experience tuning carbs. Yes I made the CV carb run but it definitely not great. And yes I know it's not gonna happen but I do want a plug and play solution .

Offline enterlance

  • Posts: 62
Re: Getting a new carb for CB750dohc
« Reply #4 on: Nov 20, 2018, 16:29:04 »
For riding, just around town and hit twisties occasionally

Offline cxman

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Re: Getting a new carb for CB750dohc
« Reply #5 on: Nov 20, 2018, 20:11:01 »
my carb kit for that bike is plug and play

they are pretuned you get them installed properly and go riding

as long as your ignition is good (9o percent of dohc carb problems are ignition/electrical)and your charging system works properly

you will have no problems if you do just call me before adjusting or "fixing" anything

pm eric from that build thread and ask him he just installed his he will tell you about his install

https://murrayscarbs.com/product/cb750-mikuni-carb-system/
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline esmoojee

  • Posts: 173
Re: Getting a new carb for CB750dohc
« Reply #6 on: Nov 24, 2018, 17:01:12 »
Iíve had cr specials on two bikes, a 79 CB750F and 93 Honda Nighthawk 750. Iíve also put Mikuni VM29ís on the dohc 750f. I had adapters for them that are pretty damn rare. Iíll say this, I liked the Mikuniís the best. They seemed the smoothest of the two types. I ended up putting on CRís which are still good carbs. CRís are pretty straight forward when it comes to tuning them if you know what youíre doing.

Offline irk miller

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Re: Getting a new carb for CB750dohc
« Reply #7 on: Nov 24, 2018, 19:28:56 »
The Murray's Carbs 2-into-1 setup has been amazing for my chopper.  I'll be happy to offer any answers to questions or concerns about that setup.  The bike is all power with these carbs.  You can't go wrong.

Offline enterlance

  • Posts: 62
Re: Getting a new carb for CB750dohc
« Reply #8 on: Nov 25, 2018, 03:49:54 »
Thanks for the advice guys! Since they are not much different regarding prices, now I'm more leaning toward the CR carb as I think they look awesome. I've seen Japanese people posting how to tune them so hopefully tuning them not gonna be a PITA.

That being said, how's the Mikuni twin carb (VM) compare to the Mikuni RS34(quad carbs)?

Offline irk miller

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Re: Getting a new carb for CB750dohc
« Reply #9 on: Nov 25, 2018, 08:42:08 »
With the two carb kit, my bike has much better torque, great throttle response and cruises at highway speed very smoothly.  It found power that was always there, but the stock carbs couldn't find.  The kit comes jetted for the bike, so it's literally plug and play.