NC30 throttle cable - How many of you run just one cable?

[rcv4]

I only run a single cable on my 35 with a ducati throttle,the amount of times the carbs have been off its a god send,i have no concern with it sticking,just make sure the cables are 100%.

[RoninZX-10R]

Are you sure your idle screw (I think that's the correct term?) is set correctly? What does your bike idle at once warm? The only reason I ask is that I didn't think it was possible to be able to stall the engine by twisting the throttle too far, forcing the carbie wheel that the throttle cable connects to (I'm struggling with correct terminology today!) past its stop.

[tigerclaw]

Following that thought, maybe the throttle cable is too tight, ie the "Carbie wheel" :) is not sitting on its adjustment screw but its still hanging on the throttle cable (ie the throttle has no free play on the cable)

[Dynamohum]

Wasn't the close cable something the japanese manufacturers started fitting to bikes in the seventies for all markets vaguely remember that it had something to do with the United States or Canadian laws at the time

[Sunnyday]

A correctly adjusted and lubricated standard throttle cable set will give no resistance whatsoever and snap shut very crisply however a badly routed non lubricated dry set will feel tight and stiff to operate and can cause the throttle to stick - honda new what they were doing.

[nickbawt]

RoninZX-10R, I agree with your thought process mate. Ive got some more carb tinkering to do when my new jets and carb bolt kit arrive, for instance I dont think my pilot screws are adjusted properly yet, and I didnt check the float level height when I stripped them on the weekend. Currently it idles around 1500rpm +/- 100, is that enough? The idle screw is adjusted just so the screw head makes a firm contact with the throttle return stop, but for some reason if I roll forward on the throttle from idle it drops the RPM down. Cables were cleaned with kero and lubed on the weekend and it snaps back into place fine so I wouldnt think its sticking.

Tigerclaw, you might be onto something. Ill take a look at it over the weekend and see. Does anyone know how much freeplay should be in the throttle?

Its strange and quite frustrating. Once my hyanes manual arrives Ill take a look and see if its adjusted properly.

Thanks for your input fella's, appreciate the feedback. Its quite easy to over look something when youve got no one to bounce ideas off.

[Cammo]

Currently it idles around 1500rpm +/- 100, is that enough? The idle screw is adjusted just so the screw head makes a firm contact with the throttle return stop, but for some reason if I roll forward on the throttle from idle it drops the RPM down. Cables were cleaned with kero and lubed on the weekend and it snaps back into place fine so I wouldnt think its sticking.

If everything is fine with the cable, then the only way the idle can drop is by closing the carb butterfly/s some more when you roll the throttle forward - you might not be able to see it but the throttle cam will have to close a little more for this to happen (tiny bit of extra pressure can cause this).

Lubricating the carb throttle cam shaft mechanism and both carb butterfly shafts might help your issue (e.g. throttle will shut full closed without needing to roll throttle forward), and a carb balance after this might help also.

Once you take the carbs of a few times in a day you'll understand why many people ditch the return cable.

Idle specification (when hot) is 1300 +/- 100 rpm.

[lukemillar]

Mine snapped, saw they were NLA and gave up. Not that I really was fussed anyway

[tigerclaw]

About the free play I think the Haynes manual says something like 10mm of free play. I can't exactly but I remember reading it and thinking wow that's a lot. .. That wont feel good? But I also don't know how they measure the 10mm. I set mine with the throttle tube housing open so that visually I could see the cable was not under tension when closed

[nickbawt]

Just to add a bit of closure to the thread, the Haynes manual arrived over the weekend which was a godsend, and turned out I needed some more slack in the throttle play. TIgerclaw, youre right.. it seems alot (though I believe its only 5mm) but it has sorted the RPM dropping low as it wasnt seating properly on the idle screw.

Now noticing that Im getting quite bad clutch drag. Had the bike up on the paddock stand and the drag is quite bad, enough to drop the RPM a few hundy when in gear a the lights. Gets better when it warms up so am hoping some fresh oil will sort it out (if oil quality is like the rest of the bike itll be in average shape), otherwise will need to investigate that further.

Anyway, cheers for you input fella's. Sometimes in the simple things that you miss huh.