Rear Wheel locks up easy - MVAgusta.net
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post #1 of 18 (permalink) Old 09-05-2006, 09:58 AM Thread Starter
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Rear Wheel locks up easy

I've put 500 miles on my F4 since I got it on Thursday and I've locked up the rear wheel almost a half a dozen times already. Once by downshifting, the rest by jamming on the rear brake in hard braking situations. The bike has an almost new Pirelli Diablo 180 on the rear.

Usually I let off the brake and allow the rear wheel to grab again, and somehow I haven't even come close to a high side even though I'm breaking the rules by not coming to a complete stop.

Anyway, are these things just prone to rear wheel spin, especially since I think my suspension is set up too soft?

I used to be able to brake like a champ on my ZX-7R, but now I'm pretty nervous when braking hard because of the rear wheel spin and the front end diving from the soft setup (even after i set the suspension to "stiff" as per the manual).
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post #2 of 18 (permalink) Old 09-05-2006, 10:43 AM
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Please don't take this wrong, but what you describe is a sign of sloppy riding.

If I am too aggressive releasing the clutch on the track, the back wheel will begin to skid (this is also a legitimate technique used by some racers to "back it in" to a corner) around a bit. This can be remedied by being smoother with your clutch releases.

Using the rear brake during "hard braking" on a modern sportbike is like playing with a bag of rattlesnakes, eventually you are going to get bit. The front brakes are so strong, when coupled with the fairly radical geometry of a sportbike, hard braking with them will have the rear wheel skimming the ground, or actually in the air. Messing with the rear brake in this situation is not good.

Last edited by luvtolean; 09-05-2006 at 10:46 AM.
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post #3 of 18 (permalink) Old 09-05-2006, 10:55 AM Thread Starter
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Quote:
Originally Posted by luvtolean
Please don't take this wrong, but what you describe is a sign of sloppy riding.

If I am too aggressive releasing the clutch on the track, the back wheel will begin to skid (this is also a legitimate technique used by some racers to "back it in" to a corner) around a bit. This can be remedied by being smoother with your clutch releases.

Using the rear brake during "hard braking" on a modern sportbike is like playing with a bag of rattlesnakes, eventually you are going to get bit. The front brakes are so strong, when coupled with the fairly radical geometry of a sportbike, hard braking with them will have the rear wheel skimming the ground, or actually in the air. Messing with the rear brake in this situation is not good.
I agree with you about the sloppy riding, but the front end really dives when braking hard with the front brake, making me lose a lot of confidence when grabbing a handful on the front brake. All the other bikes I've rode dove much less. Maybe I just need to get the forks recharged.
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post #4 of 18 (permalink) Old 09-05-2006, 11:08 AM
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Quote:
Originally Posted by psperl
I agree with you about the sloppy riding, but the front end really dives when braking hard with the front brake, making me lose a lot of confidence when grabbing a handful on the front brake. All the other bikes I've rode dove much less. Maybe I just need to get the forks recharged.
Luvtolean said it all already. Just be smooth.

As for front diving issue, check your sag and forks set up and if that doesn't do it tell the mechanic to change the fork oil.
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post #5 of 18 (permalink) Old 09-05-2006, 11:24 AM Thread Starter
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Luvtolean said it all already. Just be smooth.

As for front diving issue, check your sag and forks set up and if that doesn't do it tell the mechanic to change the fork oil.
The front forks were set up horribly when I bought the bike. The preload was all messed up. I followed the manual to set the forks to "normal", which didn't do much, so I then set them to "stiff", which didn't do much, so I think he forks are just low on oil, which is weird since the seals look 100%.
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post #6 of 18 (permalink) Old 09-05-2006, 11:26 AM
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What is your sag set at?
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post #7 of 18 (permalink) Old 09-05-2006, 12:22 PM
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Quote:
Originally Posted by psperl
I agree with you about the sloppy riding, but the front end really dives when braking hard with the front brake, making me lose a lot of confidence when grabbing a handful on the front brake. All the other bikes I've rode dove much less. Maybe I just need to get the forks recharged.
others have helped you already
but..... suffice it to say that.... the more your front end DIVES during extreme DEceleration, the more your rear is up in the air, rendering the rear brakes 110% USELESS.....
they skid because they are no longer contacting the ground... and just spinning freely in the air (almost)



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post #8 of 18 (permalink) Old 09-05-2006, 12:36 PM Thread Starter
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Originally Posted by luvtolean
What is your sag set at?
I don't know what that means. I just set the preload , compression and rebound on the front forks to factory "stiff" and left the rear alone.
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post #9 of 18 (permalink) Old 09-05-2006, 12:41 PM
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my early 750 F4 was the same, the front was miles too soft and the rear had far too much sag in it (30 mm WITHOUT me on it!) take it to a suspension expert and get him to sort it for you
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post #10 of 18 (permalink) Old 09-05-2006, 12:43 PM
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Quote:
Originally Posted by psperl
I don't know what that means. I just set the preload , compression and rebound on the front forks to factory "stiff" and left the rear alone.
Check out this file.
I think it's a good quick guide that makes it easier to understand.
Attached Files
File Type: doc Motorcycle Suspension Setup1.doc (121.0 KB, 99 views)
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