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Author Topic: Crazy revving...  (Read 1511 times)

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KillerBob

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Crazy revving...
« on: August 25, 2005, 11:25:11 AM »
Hello eveyone...new to the board and happy to find such a useful website.  I recently got a '76 750K....I love the bike to death, but I've got a problem the keeps progressing.  I'll be cruising along at any speed, tap the throttle, and it'll jump from 500-1000 rpm, then go back and accelerate normally.  It doesn't do it everytime, but most times it does.  If I give it lots of throttle, it'll either bog or jump rpm's then bog.  I figured maybe it was running lean, so I tried covering half the air box intake, and it didn't change much, except maybe top speed went down a bit.  If I shut the fuel off as I'm driving it seems to get a bit worse but not much.  If I let off the throttle at any rpm quick it seems to drop normally.  You guys got any ideas?  Does it sound lean?  Any suggestions on what to try?  Maybe a air leak?  Thank you very much.

Richard
Saskatchewan, Canada 
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Offline Killer Canary

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Re: Crazy revving...
« Reply #1 on: August 25, 2005, 11:29:22 AM »
Sounds like at least part of the problem is clutch slippage.
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Offline SteveD CB500F

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Re: Crazy revving...
« Reply #2 on: August 25, 2005, 11:36:13 AM »
Does it do it in one gear or all gears?

My 500 does this but only in 3rd. If I give it full welly it seems to jump out of gear and then back in, resulting in a short rev rise (and a jrky ride).
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KillerBob

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Re: Crazy revving...
« Reply #3 on: August 25, 2005, 02:34:07 PM »
That might be...I think the guy before me didn't have the right oil in it, so I'll try an oil change and see what happens...
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KillerBob

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Re: Crazy revving...
« Reply #4 on: August 25, 2005, 05:47:03 PM »
Well...just went and fired up the bike, put her in first, and my tach goes up, yet my tire doesn't move.  Great.  So, who can tell me where to get a decent clutch kit as a reasonable price?  Any suggestions?  Thanks.

Richard
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Offline TwoTired

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Re: Crazy revving...
« Reply #5 on: August 25, 2005, 06:15:12 PM »
Have you tried to adjust the engagement?
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Offline Bob Wessner

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Re: Crazy revving...
« Reply #6 on: August 25, 2005, 06:19:10 PM »
Quote
I think the guy before me didn't have the right oil in it

What kind of oil do you think he might have used, synthetic? If so, may take a couple of oil changes to clear that up.
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Buffo

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Re: Crazy revving...
« Reply #7 on: August 25, 2005, 08:17:23 PM »
I use Moble 1 MX-4T. It is fully synthetic and have no problems. It was my understanding that you just couldnt use Automotive synthetic because of the friction reducers.

Am I wrong? Is what I am using hurting my clutch in some way??

Don
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