Topic: 1978 cb750k Push cable - Question

[Big Red]

Hello,

I have a 1978 cb750k.

I have recently purchased a new throttle assembly and new throttle cables to replace the frayed old ones.

I have attached them at the bars and in their correct locations at the carb. The pull cable functions very well and the spring returns the bell to the closed position.

The pull cable on the other hand does not do anything productive. It is secured with the single nut, the ball/keg end is in its slot, but when the pull cable engages, the push cable ball-end pops out of its slot and the cable stays straight. It does not return to its "home" until the throttle is closed. If it is closed too quickly, the ball end stays out of its slot, rendering it useless.

How can this be fixed?

Is this a new cable stiffness problem?

Are there adjustments that can be made so the ball end of the cable stays in its slot while the pull cable engages?

Please help!

I appreciate your time.

Thanks,
Chris

[NP3]

Chris,

I have a 1978 750k also. I only use the pull cable, and have eliminated the push cable altogether. The bike was like that when I bought it and I kept it like that since it seems to work well.

I've researched the topic here and the consensus looks to be that the pull cable is enough to open the throttle and then the return spring is plenty strong to close the throttle.

I haven't put enough miles on my bike to say that this holds true over the long term, but initially it seems to be working well.

Maybe someone else can chyme in about long term performance, but my experience says to remove the push cable because one cable and the return spring are enough to do the job.

Nik

[Duke McDukiedook]

Sounds like your throttle sleeve could be worn or you need to adjust the cables at the carb end.
You may need a little more tension on that cable or you might have them switched.

[BobbyR]

Make sure the cables are seated properly at the carb and adjusted at both ends. A good functioning push pull really helps with handling. On fast idle with the choke out I can push the carb closed long enough to get it in 1st with no grind. 

[Spanner 1]

The K0 had 1 cable.... all later bikes had 2 for positive closing of the 4 throttles. Why ?... because slides can stick and carbs out of balance will cause 'runaway rpm' = motor damage., so Honda very wisely went to a 2 cable setup.... leave off the 'push' cable at your peril IMO