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Old 06-05-2006, 09:45 AM   #1 (permalink)
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Default Back tire locking up!?

So my buddy just bought an 02 R1 a few weeks back. Apparently the guy he bought it off did an engine swap on the bike for a newer motor (04-05 style). But anyways, I've been noticing a loud screeching noise every now and then when he shifts during normal riding. I think it might be his back tire locking up for a split second or something. Does anyone have any ideas on what could possibly be wrong? It doesn't happen all the time, or even half the time for that matter. Only once in a while. I've tried telling him about it and he shrugs it off or says that its not his bike making that noise (eventhough I [u]know it is). So any ideas would be appreciated. I don't want his dumbass to go down because there is something wrong with his bike. Thanks......
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Old 06-05-2006, 02:24 PM   #2 (permalink)
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If it's during a downshift, he's dumping the clutch too fast and breaking the tire loose. He'll figure that one out the first time he does it in a turn and the back end tries to come around on him.
If it's during an upshift, all I could say is that something is way, way wrong and he'll figure it out when something breaks.
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Old 06-05-2006, 03:48 PM   #3 (permalink)
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Quote:
Originally posted by Stormdragon
If it's during a downshift, he's dumping the clutch too fast and breaking the tire loose. He'll figure that one out the first time he does it in a turn and the back end tries to come around on him.
If it's during an upshift, all I could say is that something is way, way wrong and he'll figure it out when something breaks.
Nice response...
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Old 06-05-2006, 05:28 PM   #4 (permalink)
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Quote:
Originally posted by Stormdragon
If it's during a downshift, he's dumping the clutch too fast and breaking the tire loose. He'll figure that one out the first time he does it in a turn and the back end tries to come around on him.
If it's during an upshift, all I could say is that something is way, way wrong and he'll figure it out when something breaks.
Not tryng to get at you but when you downshift and you dump the clutch to fast the tire will lock up not break loose. Usually when a tire breaks loose is when it's to cold and you get on the gas to hard and the tire spins or (breaks loose) same thing if ur trying to wheelie on a cold tire and you clutch it up. You dump the clutch with the RPM's up = tire breaks loose.
Just the way i understand "break loose" Mean no disrespect stormdragon
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Old 06-06-2006, 04:17 AM   #5 (permalink)
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Quote:
Originally posted by jaydub


Not tryng to get at you but when you downshift and you dump the clutch to fast the tire will lock up not break loose. Usually when a tire breaks loose is when it's to cold and you get on the gas to hard and the tire spins or (breaks loose) same thing if ur trying to wheelie on a cold tire and you clutch it up. You dump the clutch with the RPM's up = tire breaks loose.
Just the way i understand "break loose" Mean no disrespect stormdragon


Whats the difference, the tire now has minimal traction and is dangerous from a handling aspect if not known how to control it.. If the tire is locked up its NOT spinning at all, if it breaks loose the tire is still spinning just at a different speed than what the bike is travelling..
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Old 06-06-2006, 04:37 AM   #6 (permalink)
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My friends gsxr does the same thing. Even on a upshift, since the gear ratio is so close there is enough engine brake to lock up the wheel if the clutch is let out too fast. Tell your buddy to learn how to shift
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Old 06-06-2006, 07:20 AM   #7 (permalink)
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I have no clue about why it would do that on an upshift, but I can relate to not blipping the throttle while down shifting in a turn and having the tire start to swing out on me, thank god it only went about a foot sideways... it felt like a lot more though.

He should get that checked out just to be on the safER side
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Old 06-06-2006, 09:44 PM   #8 (permalink)
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Could be shitty tires, too. On a cold night when I had my god forsaken D208's and I just started the ride that night, if I even just let off the throttle too sharp in the high revs in first gear it'd hop and slide the rear wheel all over the place without any help from clutch torque. God, I hated those things.
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Old 06-07-2006, 12:49 AM   #9 (permalink)
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All interesting comments. Thanks guys. I've only noticed it happen while he was upshifting (not to say it hasn't during downshifts though). From what I can tell, he's not shifting weird at all. There is no over-revving or dropping of the clutch when he shifts. I've watched him shift while it has happened before and it all looked/sounded normal. He's a good rider and I have never heard anything like that while riding with him when he had his R6. So, I guess I just have to talk him into taking it in somewhere to get it checked out. Thanks again....
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Old 06-07-2006, 03:05 AM   #10 (permalink)
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Is it like a tire screech, or a metal screech? I can't imagine a bike should screech under normal operating conditions. Unless it's a Harley. Who knows with those things.
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