The International CBX Owners Association

I just bought my first cbx. It's a silver 79. I know I'm opening 6 carbs but my throttle seems awfully hard to turn compared to all my other bikes. I've checked and lubed both cables and adusted them and it's still hard to turn. these carbs were recently rebuilt by TIMS. Do these CBX's have a seperate throttle spring, or does it just use the ones that are on the butterfly shafts? I remember using a lighter spring on my CB750, but I don't think this has a seperate one like that. Thanks to the group.

Its not real hard that you have to force it. Louis

No, I don't have to force it. It's just seems to have a lot of spring resistance and it makes my hand tired while riding it from holding it open at the desired speed. When you let go of the throttle, it snaps back with authority so the springs must be pretty strong. Too strong for me unless there is a way to make it easire to turn.

rdragoo wrote: Do these CBX's have a seperate throttle spring, or does it just use the ones that are on the butterfly shafts?

The X uses the springs on the shafts. The X throttle feels the same to me as my other bikes. If your throttle is returning back OK, it doesn't seem like it would be a binding issue. Have you lubed all of the throttle linkage in addition to the cables?

Congrats on the X purchase.

I see you are in CA, You might want to meet up with some others that live out there and compare. There are few guys on this site from there and there are bunch more over on CBX WORLD which maybe someone might be close to you. Louis


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It should not be that stiff, it's usually about the same as other bikes. I have 3 CBX's with slock carburation in San Diego and in August went to Colorado and back on one of them. I don't use any type of throttle assist. Next weekend is a vintage japanese motorcycle meet in Frazier Park (not to far from you) and I know there's going to be CBX's there. I might be there also. It'd be a good place to meet other CBXer's and compare your bike with others.

Welcome to the site rdragoo.......

The throttle should not require excessive force, after all, all you are doing is opening 6 little butterflies.....
Check for correct cable routing also ensure the push/pull cables are not too tight in relationship to each other.... there should be a little end play.....Cable lube helps.....
Failing that, you may have a problem with carb mechanism alignment/assembly/lubrication.......

Also check the throttle mounting on the handlebar and the interface with the switch housing. Maybe the switch housing that surrounds the cable guide/hook-up clamps on the throttle.

I haven't lubed the throttle linkage, just the cables. I wasn't aware that that was needed. I thought the shafts ran basically dry. I'll bet you have to remove the rack to do that. Anyone done this before?

rdragoo wrote:I haven't lubed the throttle linkage, just the cables. I wasn't aware that that was needed. I thought the shafts ran basically dry. I'll bet you have to remove the rack to do that. Anyone done this before?

It may not the be best way to do it but...............

I've just sprayed mine from time to time with WD40. It made a noticeable difference on my '79.

That's probably a good idea. I'll try and lube my throttle shafts in between each carb if I can manage to see down that deep. If I remember right, my old goldwing had two settings for the throttle return spring that mounted on the main pulley where the throttle cables attach at the carbs. I wonder if the CBX has a second groove there where you can lighten the pull by moving the end of the spring.

I have found that a dry lube, either a Teflon or a Moly base hangs around there a bit longer than an oil base lube... If not automotive, try the gun peeps like Brownells.... Nothing wrong with WD40 on a regular regimen though....

rdragoo wrote: I wonder if the CBX has a second groove there where you can lighten the pull by moving the end of the spring.

Just checked the carb set that I'm currently working on. I don't see any way to adjust the tension on the X.