Topic: push/pull throttle question... Yes, i searched!

[timdhawk]

I have a 78 750K. i searched all the "hard throttle" and "cable routing" posts i could read and it didn't really answer my questions.

when i have the "pull" cable (the one that wraps underneath) attached it feels just like a normal bike should,  easy throttle and snappy return. But when i hook up the "push" cable as well the throttle is the classical 78 "RFH" (really f--king hard) and it wont close at all by itself.

i have clubman bars and have tried all the possible re-routing of cables i can think of and it made no differance. And yes they are the stock length and are brand new motion pros and freshy lubed.

Is the second (push) cable just a safety thing in case the main one broke? Any issues if i run without it?

do i have any other options? and for shorter cables, has anyone figured out the perfect length for custom made shorter ones?

thanks

[ProTeal55]

I run a single cable throttle on my CB450 (as well as my old CB750) and it ran fine...

[TwoTired]

Is the second (push) cable just a safety thing in case the main one broke? Any issues if i run without it?

Only if the single return spring breaks after 30 years of flexing and metal fatigue while approaching the mountain cliff curve or an oncoming truck on the outside lane of a curve, as there will be no positive way to reduce throttle.

Then again, maybe you'll sell the bike to someone else before it breaks, so who cares, as long as it's someone else that gets injured?

Good luck!

[ProTeal55]

Bikes have been running around for years with single cable throttles.
Bottom line is he asked if he needed to run both cables, and the true answer is no.
Now if he wants to go that route or not, thats up to him.

[Blueridgerunner]

just run the single cable and remember where the kill switch (you do have a kill switch?  ) is.

[lordmoonpie]

when i have the "pull" cable (the one that wraps underneath) attached it feels just like a normal bike should,  easy throttle and snappy return. But when i hook up the "push" cable as well the throttle is the classical 78 "RFH" (really f--king hard) and it wont close at all by itself.

I run push pull on my CB450 Black Bomber race bike. I had exactly the same issue after an engine strip - it took me days to figure out what was wrong and it's sooo silly it's untrue. Even though the cables were oiled, freely routed and nicely adjusted, I could open the throttle and it would stick open like a bugger! It was real hard to get it back to closed position.

All I did was wound out the return cable adjuster screw at the throttle and it did the trick. Push Pull throttles don't seem to obey common sense adjustment laws! Try fiddling with the cable adjuster screw one at a time and see what happens. If it gets worse go the other way and eventually you'll dial it out. I wound mine out by about a centimetre in the end to cure it - snaps back very lively like now  

[TwoTired]

Bikes have been running around for years with single cable throttles.

People have been murdering other people for years, too.  You support that practice, as well?  I mean, since it's been common practice and all...

People have been giving others bad advice for years, too.  We know where you stand on that practice, already.

Not all bikes have throttles designed the same as the bike he is asking about. The mechanism employed in this bike has the closure cable for a specific reason, even if you are oblivious to it's purpose.

Bottom line is he asked if he needed to run both cables, and the true answer is no.

The cable isn't needed to make the bike run.  It is need to ensure safe/controllable operation.
But, if we follow your position, and in that same vein, he doesn't NEED to have brakes either.  Or, air in the tires, or encouragement to maim himself.

But, if that's what thrills, ya...

[hymodyne]

I lost a cable on my (Push pull)500K a while ago and lost all throttle control. over and over I'm finding that these bikes are engineered very well; go with the original design. in regard to something as essential as throttle control -why risk it?

hym

[mystic_1]

But when i hook up the "push" cable  ...  it wont close at all by itself.

This here is the critical clue.  The fact that the throttle won't close by itself when the 'push' cable is installed means that the return (push) cable is binding somewhere.  If re-routing the cable made no difference, have you considered that it may be binding inside the throttle assembly?

I'd try installing the return cable and routing all the way forward to the handlebars, but don't hook it up to the throttle.  Check the throttle action.  Next, hook up the cable and check again.

If the throttle feels fine before you hook up the cable but not after, the problem is in the throttle control housing.  If the throttle feels stiff even though the cable isn't hooked up, the problem is binding due to cable routing.

cheers
mystic_1

[JS550]

I gotta agree with the grumpy guy. Stick with the factory push/pull set up. I have clubmans on mine & it works fine. Are you sure you have the cables routed around the throttle right? I also ran my cables out in front and back through under the headlight. With the clubmans your face would be the tip of the missle should that one cable brake! I could take some pics of mine & shoot them to you if you want.
                                                                     Jim

[timdhawk]

I gotta agree with the grumpy guy. Stick with the factory push/pull set up. I have clubmans on mine & it works fine. Are you sure you have the cables routed around the throttle right? I also ran my cables out in front and back through under the headlight. With the clubmans your face would be the tip of the missle should that one cable brake! I could take some pics of mine & shoot them to you if you want.
                                                                     Jim

yes...please. some pics would be very helpful. thank you very much!

[Hush]

My guess is the cable not returning cleanly will be unravelling inside the outer casing.
Remove both cables and check the action again away from the carbs.
Guessing there is a big fat birdsnest in there somewhere.
I would not ride my (cb650) bike with the single cable only, single was fine on all my old 2 stroke bikes right up to Suzi T500's but having felt the power of the return spring Honda fit to these big 4's you gotta see the need for that second cable.