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1982 Honda cb450sc Nighthawk. Just bought. First bike. Was riding it this morning everything was fine then after around an hour I felt that when I pulled in the clutch to stop and then wanted to take off I couldn't find the sweet spot. It just cut out. Instead of how it was earlier which was when I slowly let off the clutch and add throttle it was somewhat smooth as im getting use to it but then i stopped pull the clutch in And add throttle it didnt want to take off at all. I got it going but I had to push the bike/walk the bike then let of the clutch and add more throttle then usual to get it to engage. then as I approached the next stop it just cut out on me again. It was acting weird as I would finally get it to go as I stayed in first it seemed to just jolt and want to give out. Its like it was choking up as i got going in 1st but it was...clunky feeling. I didn't have the problem an hour before, it was smoother. Turned the bike on later let of the clutch and it was wanting to go on its own again allowing me add just a little bit of throttle. Any suggestions on what could be going on and how I can fix it?

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  • Motorcycles Master
  • 49,985 Answers

It appears the you have a clutch pressure plate problem in that it is slipping and overheating to fade condition. Check for oil level as most bike clutches run in oil. Check clutch cable adjustment. Check cable for kinks and split wires.

Posted on Apr 27, 2013


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Posted on Jan 02, 2017

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SOURCE: bike trouble

Yes! You will open those things up, and they will probably look pretty clean, but the problem with your carbs is in the Idle circuit - too small for you to see into. If you do a search of carb cleaning or related topics, you'll see that alot of folks with cab problems try to clean their carbs ... only to have to open them up again due to improper cleaning (They are difficult to clean properly, require alot of patience) So, I would suggest that you have them cleaned professionally, or at least buy good carb dip to get them really clean. Spray cans of carb cleaner are worthless. Might as well wash em with dish soap.

Posted on Nov 20, 2008

  • 128 Answers

SOURCE: bought a used 88 cr250 and like and idiot i didnt

sounds like you need a clutch. Yes the friction plates should move a bit when you pull your clutch lever in that is how the clutch works what oil are you running in you tranny and have you tried adjusting the clutch cable? When you had your clutch apart what did the friction plates look like was there much meat left on them?

Posted on Oct 03, 2009

Testimonial: "thanks for the info...thats what i thought, just didnt want to hang parts and hope"

  • 15 Answers

SOURCE: I just bought a crf250r

try clutch out

Posted on Apr 29, 2011

  • 4565 Answers

SOURCE: After coming to a stop and trying to accelerate

If you just replaced the petcock, you may want to go back and check for a good fuel flow. Pull the fuel line loose from the carb. Hole a catch container under the fuel line and press the start button. The bike should start up and run for a short while or spin over a few times. Either way, watch the fuel flow and see how is coming out of the hose. Does it look like it is enough? If not, check the vacuum line going to the backside of the petcock if you installed an OEM petcock. If you installed a manual aftermarket petcock, did you plug the vacuum hose that went to the backside of the original?

If you have a good fuel flow, you may have gotten some water in your last fuel stop. There may be a screw right on the bottom of the float bowl of the carb. Back this screw out and it will allow the float bowl to drain thorough the hose. Catch it in a catch container and look to see if it's got water in it. If so, buy a can of Sea Foam fuel conditioner and pour some in the fuel tank. This will help get the water out.

If all that fails, you may have trash in the accelerator pump or the slow speed jet. Take the air cleaner cover off the air filter. With the engine OFF, twist the throttle wide open while looking into the carb. You should see a squirt of fuel come out of the brass nozzle in the mouth of the carb. If not, your float bowl is either empty or the accelerator is not working.

Good Luck

Posted on May 05, 2011

  • 38 Answers

SOURCE: I just bought a 2004

Sounds like you have a float sticking in your carburetor, is this a single carb or a duel carb? , also gas can go stale and your bike will run like **** if it also has been subjected to tank condensation and water in your gas, that also maybe your problem, I would drain the tank and drain the carb or carbs, and start off with fresh gas and would use 89 octane or better, also pickup some StarTron Enzyme gas treatment, it will stabilize your gas for up to 2 years, and remove the ethanol from your gas, that is a bad for your motor, try it you will never go without it. Good luck, Rick.

Posted on Aug 06, 2011

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