My "new" 1980 cb750 Super Sport. I got the bike for free, but it's near mint condition, been in temp controlled storage since 92. Only problem is it was put away without proper storage preperation. Had to clean the fron master cylander, but otherwise nothing too bad, dropped the carb bowls, looks very clean. Only problem I can't figure out, even with the Clymers is the really stiff throttle. It barly moves, though I can see the cables move freely, the part the cables attach to on the carbs is whats almost locked up. I can pry it to wide open throttle with a flat head screw driver, and push it back to idle position, but it's too stiff to do with the throttle? What would cause this to bind up so much? Please help!
I had the same problem with my dads old bike that had been sitting for 10 years. What I had to do was take them off and keep wiggling them back and forth while adding copious amounts of liquid wrench. It took several sessions but the throttle snaps open and shut the way it should.
I've never heard of this being a problem, especially if the bike isn't total junk. Keep us posted on what you find, will you? I'm guessing it's gunk in the carb body itself, not something on the outside, but I'd like to hear where the problem truly lies. If things are that stiff with the throttle, I'd probably double check to make sure the slides move freely...stuff like that. I'd probably do a good carb cleaning anyhow if it were me. If you're reluctant to do that, at least plan on using some Seafoam for a while to help make sure your passages in the carbs are clear. The bowls being clean is definitely a good thing, but you still need to be concerned about your floats, float needles, and slides being sticky even if everything looks good. Doesn't take much gas to make things gummy. Just remember that if you aren't familiar with cleaning carbs, carb cleaner and rubber parts DON'T mix well. You need to be sure to follow your manual closely if you do decide to clean your carbs. If you have questions about this, post them before you start...it can really save you headaches later on. One thing to keep in mind when it comes to older cables is that they sometimes can seem like they're okay when off the bike, you can check them and they'll seem like they move alright, but as soon as you get them put on the bike with the bends everything, they'll bind enough to cause a stiff throttle. Just thought I'd mention that in case things still seem stiff even after you take care of the carb work.
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