RPM's shoot up, bike doesn't gain speed - Honda Motorcycles - FireBlades.org
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post #1 of 10 Old 09-04-2010, 4:38 PM Thread Starter
 
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RPM's shoot up, bike doesn't gain speed

I need some help guys. My CBR F4 is taking forever to take off. I can't get it past 70 mph either. For example. If i am in first or 2nd gear and i'm at 7000 rpms, the bike will probably be going 10-20 mph. can anyone tell me if i need a new clutch or something else?
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post #2 of 10 Old 09-04-2010, 7:38 PM
 
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Re: RPM's shoot up, bike doesn't gain speed

sounds like a clutch issue to me. did you make sure you had the right amount of freeplay in the clutch lever? if you dont have enough freeplay it will make the clutch slip all the time, and wear it out quicker. try putting some slack in your clutch line. a little too much slack is better than not enough. if that doesnt fix it, then i would say drain the oil, and pull the side cover off, and check the clutch drive plates and the friction material to see if thats the problem. replacing the friction disks isnt a big job, it can be done in 4 hours by a noobie.
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post #3 of 10 Old 09-04-2010, 10:00 PM
 
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Re: RPM's shoot up, bike doesn't gain speed

sounds like it is time for a new clutch but do check the cable adjustment but even if you do adjust it correctly your clutch will still need to be replaced by the sounds of it and hopefully all you will need is the friction plates and the steels.

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post #4 of 10 Old 09-05-2010, 1:59 AM
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Re: RPM's shoot up, bike doesn't gain speed

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Originally Posted by CBRF4600 View Post
I need some help guys. My CBR F4 is taking forever to take off. I can't get it past 70 mph either. For example. If i am in first or 2nd gear and i'm at 7000 rpms, the bike will probably be going 10-20 mph. can anyone tell me if i need a new clutch or something else?
I would start by easing tension off the clutch cable to ensure the clutch is fully releasing.
Have you recently changed the oil?

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #5 of 10 Old 09-05-2010, 6:13 PM Thread Starter
 
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Re: RPM's shoot up, bike doesn't gain speed

Yes, i changed the oil 2 months ago and havent gone over 500 miles this summer so far. I also readjusted the cable. when i'm at 8000 rpms on the highway in 4th gear i still can't see pass 80mph. So i'm guessing it's time for a new clutch. The stealership is quoting me at 400.00. Does this sound accurate? i have never had to replace clutch on any bike.
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post #6 of 10 Old 09-05-2010, 6:54 PM
 
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Re: RPM's shoot up, bike doesn't gain speed

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The stealership is quoting me at 400.00.
That would be installed I hope?
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post #7 of 10 Old 09-05-2010, 7:54 PM
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Re: RPM's shoot up, bike doesn't gain speed

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Originally Posted by CBRF4600 View Post
Yes, i changed the oil 2 months ago and havent gone over 500 miles this summer so far. I also readjusted the cable. when i'm at 8000 rpms on the highway in 4th gear i still can't see pass 80mph. So i'm guessing it's time for a new clutch. The stealership is quoting me at 400.00. Does this sound accurate? i have never had to replace clutch on any bike.
Did you use the same oil that was in it before or is a different oil?
You mean you tried adjusting the cable with no improvement?

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post #8 of 10 Old 09-08-2010, 5:49 PM
 
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Re: RPM's shoot up, bike doesn't gain speed

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Originally Posted by CBRF4600 View Post
Yes, i changed the oil 2 months ago and havent gone over 500 miles this summer so far. I also readjusted the cable. when i'm at 8000 rpms on the highway in 4th gear i still can't see pass 80mph. So i'm guessing it's time for a new clutch. The stealership is quoting me at 400.00. Does this sound accurate? i have never had to replace clutch on any bike.
Thats a mad price for a set of plates even if it includes labor.
Get the clutch plates off ebay and fit them yourself if you can. You'll save more then 200 quid on it then.
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post #9 of 10 Old 09-09-2010, 1:03 AM
 
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Re: RPM's shoot up, bike doesn't gain speed

If you do the job yourself (and it is really easy honestly). You'll need to measure your spring length after you take the clutch pack apart to check their spec too. Also, depending on the model, you'll need 2 or 3 different sets of plates. The outer plates were a special grip friction material. Use the many websites out there 'ayers' and others, for their online parts diagrams...

good luck.
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post #10 of 10 Old 09-09-2010, 10:07 AM
 
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Re: RPM's shoot up, bike doesn't gain speed

What oil, exactly, did you use?
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