Topic: NEED ADVICE - Carb Rebuild VS Cycle Gear New Carbs

[JonathanHValencia]

Hey fellas,

I’d like some feedback on a matter. I’m in the market for carbs, and I’m weifhing out my options. I can go with either of the following:

1) Have my stock carbs on my 1974 CB750 K4 cleaned rebuilt, rejetted etc by Rick at OldSkoolCarbs
This service will run me about $350-$400

Or

2) Purchase a set of Dual Mikuni Carb system from cycle Gear. This will run me $500
The Carbs include the following :onda Twin Carb Kit includes:

(2) VM34 mm Mikuni carbs (prejetted)
Special cast alloy  manifolds.
Motion Pro turbo throttle (7/8 or 1" Bars)
Motion Pro throttle cable.
Velocity stacks (screen type)
Carb rubbers and stainless clamps.
Extra jets

Link below,

http://www.cyclexchange.net/Honda%20Twin%20Carbs%20Page.htm

[JonathanHValencia]

Cycle Exchange!!!*** 

[Scott S]

 My vote is for original carbs.

[Stev-o]

My vote is for original carbs.

+1.  Your bike is stock for the most part, right?

[TwoTired]

If you want to do more street riding than tinkering, go with stock carbs.

If you want a tune and try extended adventure for a race track, go with as much change as you can afford. 
But, if you won't rebuild the carbs on your own, I expect you don't want to go through repeated wrenching on carbs to get them to run well on the street.

Cheers,

[Jerry Rxman Griffin aka MuthaF'er]

If you just want to spend money then get a new set of Keihin CR29's. 2nd choice would be to clean your's yourself. Why rejet?!?

[DaveBarbier]

I'd also go stock carbs. Much less of a headache and they're not at all restricting on even a modded 750.

The Mikunis say prejetted, but they can't know exactly how it's going to perform so that's only a ballpark. Be prepared to buy a handful of jets and go to a dyno or do plug chops to dial it in. If your bike is stock, Honda engineers did all the dialing in you need back in the '70's.

Also, member Harrisuluv sells and rebuilds carbs and sells carb parts. You'll only find good things said about his work on this forum. Shoot him a PM if you want another option.

[Swoop]

I have heard nothing good about dual carbs.

Steve

[tlbranth]

What 2T said. Additionally, $350-$400 to rebuild? If they're anything like K0 carbs there's nothing to rebuild. Put them in an ultrasonic cleaner, blow out all the channels with Brake Kleen, set the floats and Bob's your uncle. Spend the money on new manifold rubbers. All this is supposing they're no more complicated than K0.

[Bodi]

If you're afraid to dig into the carbs, beware that other carbs whether new "pretuned" MICs, repurposed carbs from another model, dual Webers, or whatever... will need MUCH more carb fiddling than cleaning and adjusting a stock set does.
There's usually no need to rejet if you have stock carb setups and stock engine/intake/exhaust. The jets wear extremely slowly.
A good cleaning of your carbs, without pulling the rack apart, setting the floats, and then syncing them is likely all you need - and that work isn't really high precision or very skill intensive. Unless the fuel tube O-rings are bad you shouldn't need to disassemble the rack

[Stev-o]

Also, member Harrisuluv sells and rebuilds carbs and sells carb parts. You'll only find good things said about his work on this forum. Shoot him a PM if you want another option.

FYI - James has been unresponsive to email lately and has received bad reviews on eBay about it. 

I hope all is well with him and be back soon

[ekpent]

 Early pre 1977 CB750 carbs are the easiest carbs to clean of just about any I have ever worked on. Very good project for new to motorcycle wrenchers and 'rebuild' kits are not really needed. Clean and re-use the old stuff and maybe get some o-rings for your fuel pipes if you need to strip them that far.

[humpty1]

I appreciate that advice !   Just joined the group today.   Starting  to get interested in my K0  that has been in the basement for 25 years.  Sorry but it has lot of mods but it is a 69    Where do I purchase the carb monifolds ?

thanks    Bob in Canada   (got mine in June 69 in Toronto)

[scottly]

I believe the dual Mikuni set-up interferes with a stock frame? Best performance will be with one carb throat feeding one cylinder.