In all my years of riding and fiddling with motorcycles I have never run into this. I set my bike up over the winter after doing some work and that included adjusting the throttle cable. Needless to say, it was pretty cold out in the shop without any heat. Yesterday I went to take the bike for a spin and the temps were in the 80's. Bike started and revved and held at pretty high RPM. I figured I had a cable out of the socket or maybe a stuck slide. Mutiple checks and attempts to free a stuck slide resulted in no change. So I put the bike on the lift and started to take it apart. Exhaust has to come off to get to the left filter (CL77) so this is a PIA. When I looked at the slides, they were open, but free. As I ran the throttle up and down it appeared they were hanging off the cables. checked everything and all was well. I had ridden the bike just a few weeks previously in 40 deg temps and all was well. After some more checking it appeared the throttle cable was too tight. I adjusted it and everything was normal again.
This makes no sense, since the cable should have gotten longer with warm weather. My only guess is the housing grew more than I would expect and tighted up the cable setting. Of course I have the Motorgiro coming up this weekend and thought my bike was ready to go. Murphy lives in my garage, I'm sure if it.
Might pull the splitter apart tonight just to be sure nothing is going on in there. Hard to believe that a 40 deg swing in temp would do this. I know it does not take much to raise the RPM on an unloaded engine.
regards,
Rob
Cold weather cable adjustment - lesson learnedRob
Maybe it was the outer cable that grew a little.... I had a similar problem with my CB400F once but realised that I had cable-tied one of the throttle cables (the inner) to the frame when I was 'tidying up' the wire harness. G '60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160 '66 Matchless 350 '67 CL77 '67 S90 '77 CB400F Well I have to say that I could not believe what I found. I'm still having a hard time believing it. Weather broke here but the roads are still kind damp. I'm going to pull the tank and make sure I did not miss anything when I was in there yesterday. My only other suspicion is the cable adjuster was loose. Maybe I snugged it up when I was doing something else and it escaped what few synapses I have that are still firing. I hate stuff like this because I'm too anal to not know the root cause.
That's it. I'm gonna tear into it again right now. regards, Rob Bonehead of the Month Award - And this month's winner is....You know, the realization that you are getting older and things are getting slower sucks for sure.
I went out to the shop and figured that before I dug into the seat and tank, I'd check the twist grip to make sure all was well. That's when a synapse that had been out of service decided to fire again. Last month in prep for the Motogiro I replaced the throttle friction screw with a knurled knob and spring affair that would allow me to hold the idle high to warm up the engine while I did other things. As I pulled a screwdriver out of my toolbox, I remembered that when I had the twist grip apart I had straightened out one of the ears for the slotted hole that the cable barrel fits into. One ear was bent such that the cable did not sit straight in the slot on the twistgrip. I kinda remember backing off the adjusting nut to give me some slack in the cable. I must've just snugged it up to remove the slack and never got around to properly adjusting it. This would explain the very high idle situation. So I'm satified that I figured it out and my theory that the cable had expanded in the heat is just another urban legend that will probably carry on long after I'm dead. I think I'll leave this thread open for a day or two so those who read the initial post can see that it was all a figment of my imagination. Then I'll delete it to avoid any confusion or false theories based on this ever popping up in the future. If the forum ever decides to have a Bonehead of the Month Award, I would appreciate you considering me for initial presentation. I'd even be willing to consent to using my likeness on the trophy. Not that my likeness would make it much of a trophy. regards, Rob
cablesRob,
I vote for leaving this one up and visible. It serves as a good reminder that even the seasoned vets can be bound in brain farts once in a while and what the hay, it makes for interesting reading. No one is perfect as they say,,,,,,,,,,,,,,,,Rusty
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