Topic: CB750 K1 throttle cable length problem and other things

[mycb750k6]

1. So I bought some after market throttle cables for a CB750 K1 and they seem to be about a half inch long - at the pull cable. I have all the adjustments all the way out but have about another half inch slack to get rid of. Is there any way to do this?

2. Secondly, I'm not sure the rack the carbs are bolted to are for a K1. The spring fits around a nob in the top of the rack rather than fit through a hole which results in the spring being pulled tighter than my other K1s.  Could this rack be the cause of the cable length problem too? Is this enough info or do you need pictures? Anyway it's really hard to twist the grip with this tight a spring.

3. What's a quarter-turn throttle tube?

[dave500]

the stock throttle moves say about half a turn,maybe less,its a fair amount in one twist,a quarter turn one opens fully with less twist,the old fours dont really like a sudden opening of the throttles so you would have to get a feel for it.

[Otto]

I am going thru the same issue with the pull throttle cable on my K1. ~3/8" too long. I can adjust the slack out, but, when I do that, the throttle doesnt snap back to idle as is should.

I got mine from Z1 Enterprizes, (great folks), but I may have ordered the wrong one... They have a few to choose from.. I'm gonna give em a call.

I may also try re-routing it and see if that helps, when it warrms up a little. It has turned cold here already, 25 degrees this morning....

DSS does not have any more OEM cables.. Any one have a source.  

bc

[andy750]

OEM cables are the way to go. For years I went with the cheaper option but I was never 10% satisfied due to fitment issues or something else. OEM only now for me. Huge difference in quality and longevity.

I used to get mine from DSS but BikeBandit or ServiceHonda should still have them. Sure they cost more but you get what you pay for in this case.

Andy

[MCRider]

the stock throttle moves say about half a turn,maybe less,its a fair amount in one twist,a quarter turn one opens fully with less twist,the old fours dont really like a sudden opening of the throttles so you would have to get a feel for it.

The radius of the pull wheel is so large on a 1/4 turn that it won't fit in the switch housing (I think). I've had 1/4 "quick" throttles, but they are all outside of the switch housing.

I've heard that a CB900RR tube is quicker and will fit in our housing, no confirm on that.

Still, back to the OP problem, that's not a fix for a cable with too much length on the inside. The slop will still exist.

[Johnie]

I have to agree with Andy and go with the OEM. I put new OEM cables on my KO, K1 & K4. All fit perfect. If you guys working on the K1 need a pic let me know.

[HondaMan]

The pull cable for the F1/F2/F3/K7/K8 PD carbs looks exactly like the one for the earlier 657/07A (1970-1976 K model) carbs, except the wire is 3/8" (6mm) longer. They often get mixed up, either in ordering or in dealers' inventories.

The longer cable cannot be made to fit without a lot of throttle slack, so try to trade it back in for the right length.

[dave500]

im guessing if its an aftermarket one itll be not quite right in the 6mm department,more of a one size fits all approach?if the salesman says just bend the mounting point,bend him.

[mycb750k6]

3/8" too long huh? I can fix that. I've read here about others soldering a new end on. I'm annoyed at this and am determined to make it work. I may cut the end off, tie a not in the end and solder on a piece of brass tube before throwing it away.

On the 1/4 turn throttle tube topic, I asked the guy who has one again and he gave me the impression they were rather common in his circles but couldn't provide a vendor. He's a cafe, dragster, midnight racer kind of guy and likes the instant full throttle response - "right on"!

[GammaFlat]

I'm in the same boat.  I have a cable (inside wire) that is too long.  My cable is slack while fully "adjusted out" - very irritating with a new cable.  Mine was Parts-n-More I think which I thought explained my problem.  hmmmm

There was a link on this forum a couple years ago that took you to another Japanese bike site (can't recall which.. Yamaha maybe?!), where a guy does a "how to" put a new end on the cable.  It involved using a piece of copper tubing with an Inner Diameter the same size as the cable end.  You drill a hole in the side of the copper tubing the size of the cable.. push the cable in.. fray the end.. pour hot lead into the tube.. cut away the copper.  Trim as needed.  Voila!

I'll probably end up buying new Honda cables (my brother will get the crappy ones on the K4 project... shhhhh)

[Johnie]

Just curious...what is the price difference from the OEM to the aftermarket ones. I paid $31 for cable A and $42 for cable B on my K4.

[GammaFlat]

Just curious...what is the price difference from the OEM to the aftermarket ones. I paid $31 for cable A and $42 for cable B on my K4.

I don't recall what I paid for the aftermarket cables but it probably wasn't worth it.  At the time, I was not on this forum and had about "one" source for parts (local motorcycle shop). 

www.hondanuts.com has the HONDA OEM "A" cable and "B" cable for $30 and $35 respectively which in my mind is cheap enough to not consider aftermarket. 

[Johnie]

Just curious...what is the price difference from the OEM to the aftermarket ones. I paid $31 for cable A and $42 for cable B on my K4.

I don't recall what I paid for the aftermarket cables but it probably wasn't worth it.  At the time, I was not on this forum and had about "one" source for parts (local motorcycle shop). 

www.hondanuts.com has the HONDA OEM "A" cable and "B" cable for $30 and $35 respectively which in my mind is cheap enough to not consider aftermarket. 

I have to agree with you Gamma...the OEM stuff is top notch compared to some of the aftermarket stuff. Not to say some aftermarket stuff will be fine, but I just have never had a bad issue with the OEM to make me want to try aftermarket. Granted, if money is an issue then a guy has to do what he can to save a few bucks here and there and that is where the aftermarket stuff might help a guy out.

[dave500]

3/8" too long huh? I can fix that. I've read here about others soldering a new end on. I'm annoyed at this and am determined to make it work. I may cut the end off, tie a not in the end and solder on a piece of brass tube before throwing it away.

On the 1/4 turn throttle tube topic, I asked the guy who has one again and he gave me the impression they were rather common in his circles but couldn't provide a vendor. He's a cafe, dragster, midnight racer kind of guy and likes the instant full throttle response - "right on"!

so long as your motor can handle a sudden wide open throttle from idle sure,two stroke dirt bikes can handle it,my qjet equipped car can handle it,the idea is that you dont have to move your wrist so much into an awkward angle,most sohc bikes wont handle it,as a wrist saver on our old sohc bikes its ok so long as you get a feel for the speed of opening the slides,and dont blame the carbies or what not for the big "hole" or flat spot you encounter if you yank it open from low revs.