Hi guys just bought a 93 cbr 600 had a ninja 500 before so its my second bike. The bike I bought has probably had 100 miles put on it in three years and needs little tic. First question, besides normal maintenance is there anything I should look at that's specific to these bikes that might need looked at after sitting. I'm a mechanic for cars but can do most things on a motorcycle so can probably do everything myself. Second question, idle speed what should bike idle at while warm? Carbs need cleaned badly but wondered what normal idle rpm is normal. Third question, I believe throttle is adjusted to tight or something and not dropping revs and therefore up shifting is almost like you are trying to shift without letting off the throttle. But seeing how clunky are up shifts supposed to be, at high rpms it shifts better but up shifts clunky at lower rpms. It engages fine and stays in gear just sounds like I don't know how to shift. I know once I get throttle worked out it will help and I know Hondas do tend to have gearboxes that are not real smooth. So some insight into these topics I'd really appreciate. Thanks so much for everyone's time.

 

Throttle cable slack can be adjusted at the handle bar. Definitely give the carbs a good cleaning. I would also check the fuel tank, see if its rusty/needs cleaning also. Idle should be around 1100/1200 rpms, if I remember correctly. Make sure your grip isn't the cause of the rpm hang up. Sometimes it gets pushed against the starter button housing, which would slow down it returning. Check out the carb cleaning "sticky". wvuf293? Where are you at? I'm 20 miles south of Morgantown, maybe we could get together. I could lend a hand.

 

Frank does remember correctly - set idle at about 1200.

Frank already mentioned the throttle cables - the easiest thing to check for is throttle cable adjustment and routing, especially since you need to yank the tank and airbox assembly to get to the carbs, after which you can fully examine the adjustment of both the pull and return throttle cables. It's also possible the cables might need to be lubed - if it were me, I would just get this done while it's so easy to manage, so that you know the cables are in good shape.

If the cables are fine, and since you know the carbs are feelthy, it's possible you'll find resolution to the hanging idle issue with a throrough cleaning - a lean condition in your pilot circuit will cause this hanging, and a good indicator of whether or not this is the case, is if it idles fine until the bike gets fully warmed up, and then begins to hang.

Obviously, you need to pull the jets for all ciruits, and soak them in carb cleaner, but for the pilot circuit, not only do you need to pull the actual pilot jets, but also the fuel adjustment screws, which meter the pilot circuit - these are the screws with the D-shaped head, that sit in the shafts between the fuel bowls and engine-side of the carb throats.
To have a baseline of previous setting (even though we really don't know if the current setting is correct!), before you remove those screws, turn them each in to fully seated, to see how many turns out they were to begin with.

Also, watch for the little stuff - on each of those screws, there are some small parts that you don't want to lose: a spring, washer, and O-ring.

Welcome to the forum, and good luck with the bike!

Oh, and, have you got any pics of this machine? We likey pics!

 

Thanks for the help, adjusted for more play on throttle with the adjustment near the grips, and helped a little bit. Seems to not shut as fast as it should but not enough to cause the hang. Put sea foam just as an easy thing to do quick and seems to run better every time I ride it. Know I'm gonna work on carbs this winter just enjoying riding the little time I have left, since other than the slight rev hang at low rpms the thing really scoots at high rpm. I am in morgantown and even though I am good with cars haven't had much carb experience and would welcome some help real visual learner. Changing oil today and plugs and air filter this weekend. Plan on removing headers and cleaning them up doing some high temp black on em. Really look forward to tearing bike down a bit and learning all I can. Can tell this bike is put together well and made with quality. This bike just didn't get to stretch its legs for awhile and taking it out and giving it exercise seems to only improve the way she runs. Ill try to get some pics today, I think she is gorgeous, I'm 27 and remember being young and seeing these bikes and being blown away. Thanks again for everyone's help much appreciated.

 

Yea Frank would def appreciate some help on carbs mainly. Just don't have much experience with them. Live in morgantown, be cool just to ride together. Once it gets colder will do carb and some visual improvements to headers, some brackets etc.

 

Ok an update, after riding for a few days and an oil change my only clunky shift is first to second, and this seems to be partly due to the rev hang at low rpm since if I shift at 11 grand it doesn't clunk. Rev hang is a little better but ill get into those carbs for my winter project and I'm sure it'll help it out. Had the fairings off and it's a very clean bike no rust at all except exhaust, has the original fasteners on the original fairings pretty impressed by that. So really falling in love with this bike it's one very well built bike and ill probably keep it until I die. Other than the minor rpm hang, once it settles down idle seems a good speed and it doesn't stall impressive for a bike that's sat for the last few years. Once I'm approved I will put pics on my profile it's not letting me yet, but its the stock 93 white, blue and red with white rims, never been dropped, seems to get a lot of looks when I take it out, I prefer it to the modern designs.

 

welcome.. i love the 93 red/white/blue color.. best of luck with it...

 

Welcome, another thing to look out for on these bikes is the OEM cam chain tensioner and r/r, if its the one without the cooling fins. Other then those these bikes are though

 

Thanks scorch I'd been seeing things about the tensioner probably be another winter project along with the carbs. Bike is hanging revs less and less everyday but still gonna clean carbs out you can just tell the bike needs it after sitting. Just so damn fun at this point and runs good enough to enjoy so when she is parked for winter will get some attention. Just ordered some new pirellis, tires that are on It are crap so ill enjoy it even more when I can turn better been taking it easy cause of tires. Still waiting to be able to load pics on my profile really wanna show you guys the bike, not in as good shape as some I've seen on here but for being never dropped and original honda fairings can't complain, thanks again for the suggestions. Might be asking some questions when it comes time to take carbs apart.