Topic: Cycle X carb kit

[MJL]

I did a bit of searching here in the forums, the last thread on this was 2 years ago.   I don't believe my 750 runs as well as it should and I hate fiddling with carbs. (Not to mention all the work it takes to get them out)  Does anyone have any experience with this 2 carb setup or any input on it?

[eldar]

You should be able to do a search on it. There have been a couple of people to try it. They seem to work good once they are tuned right but it is a pain and there are issues with fitting them HOWEVER the guys at cycleX seem to be very helpful from what I hear.

[MRieck]

 I know CR's woud be easier to fit.

[mrbreeze]

I remember Mlinder outa Oregon didn't like it but also remember hearing that others had good results and Cycle X was good for customer support. I was was kinda interested in it just for the fact that they looked easier to deal with. I think for the cash that you will lay out...I would go with MReick and go CR's.

[MJL]

I've been thinking about this, and about fuel injection, and about building an 836. 

I guess I'm just gathering info while I save for a built motor.  A built motor would be cheaper than a new bike.

[fuzzybutt]

gerhed has a set on his 750f i believe

[Jinxracing]

I've got set on my CB750 project. Haven't finished it yet, so I can't tell you how well it runs. However, I can tell you that when Mike at CycleX says that they don't fit well with a stock frame, he's not kidding. The carbs and manifolds bolt up just fine, but the carb mouth is about 1" away from the vertical frame member on both sides. If you try to move the carbs to either side for air cleaner clearance, the throats no longer aim directly at the "V" split inside the manifolds; according to Mike, not having the carbs aimed directly at that "V" will cause them to run poorly. I'm still scratching my head as to how I'm going to fix this problem. I may end up just trimming some velocity stacks to fit around the frame tubes. Of course, if you're willing to cut and move some frame tubes it's not an issue, but I'd rather not cut my frame. Picture below doesn't show a closeup, but it give the general idea. If you come up with a solution that doesn't involve cutting the frame, I'd love to hear it.

[mrbreeze]

I guess that setup is more suited for a chopper(ie..non stock frame). If you have to do bizarre mods to make it work...it probably isn't worth the hassle. I get a kick out of reading what people do to these bikes for carburetion but the all time worst thing is to run stacks. Why would you wanna run dirt through your engine??

[bigsherm]

Sure seems like you could just use a curved piece of radiator hose instead of the carb rubbers, to bring the carbs parallel to eachother.  When I roadraced, the single cylinder guys commonly used a big ol' honkin' piece of tubing for their carb manifolds because their carbs were so huge.  Worked fine for them, and it seems a cheap and perfect fix!

Sherm

[eurban]

From what I understand, the angle of the carbs shown in Jinx's picture is the ideal one from the standpoint of performance.  Unfortunately the placement doesn't jive with the stock frame.  Change this angle and according to Cycleex themselves performance is less than ideal.  Kind of defeats the purpose!  Look on Cycleex's site and you will note that now there are quite a few pics of engines with CR carb setups . . . .

[bigsherm]

Performance may be less than absolute ideal if you angle the carbs in, but I bet that performance is still wayyyy better than leaving the stock carbs on because you don't like the angle the Cycle-X carbs are made with.

Sherm

[MJL]

I guess that setup is more suited for a chopper(ie..non stock frame). If you have to do bizarre mods to make it work...it probably isn't worth the hassle. I get a kick out of reading what people do to these bikes for carburetion but the all time worst thing is to run stacks. Why would you wanna run dirt through your engine??

When I had my carbs and airbox out I noticed that the airbox boots were like mini stacks.  Mine aren't perfect anymore but I don't think that replacing them would have much of an effect.

[Jinxracing]

Performance may be less than absolute ideal if you angle the carbs in, but I bet that performance is still wayyyy better than leaving the stock carbs on because you don't like the angle the Cycle-X carbs are made with.

Sherm

Well, that's debatable I guess. The only person I know of who has dynoed these carbs is Mike at CycleX, and he was pretty adamant about keeping them angled exactly right. If they get moved off to either side, one of the two cylinders in each pair will be receiving more fuel than the other, which is a potential tuning nightmare that I don't want to deal with. I've got a couple of ideas for air cleaner setups; I'll definitely post them if they work. 

[eurban]

Performance may be less than absolute ideal if you angle the carbs in, but I bet that performance is still wayyyy better than leaving the stock carbs on because you don't like the angle the Cycle-X carbs are made with.

Sherm

Well the kit is $500 and the guy that developed and sells the kit mentions that the kit doesn't really fit stock framed bikes. He also doesn't recommend changing the carbs angles to the point that is required to allow one to install pods or velocity stacks on the setup. Instead, he sells CR carbs as an alternative to the non custom framed chopper crowd. . .  . .  I guess I can't see the point in spending anywhere close to that amount of money for a set of dual carbs that don't properly fit my bike or work to optimum performance.  Money aside, I wouldn't bet that the performance is wayyyy better than stock carbs.  The reports I have seen from those who have bought the kits are pretty mixed.

[mrbreeze]

What Eurban is getting at here is that if you are gonna spend big bucks to improve the carbs,go a few more bucks and get the CR's. They can be worked into the stock frame and run filters. Look back at Jinx's bike again and note how close the carbs are to the frame rails.You are'nt gonna get any filters in there and unless its a race engine that you will be rebuilding all the time,it just won't work.Curious to see what you do there Jinx.

[Jinxracing]

.Curious to see what you do there Jinx.

That makes two of us.