Front end pulling!! - TwoWheelForum: Motorcycle and Sportbike forums
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post #1 of 36 (permalink) Old 06-25-2006, 01:46 AM Thread Starter
 
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Front end pulling!!

OK im thinking this may be suspension related but Im not for sure. My buddy just got an 03 600RR. Only time down was a slight tip over into the house (minor crack in the front fairing). So that shouldn't be a big deal.

However, i took it for a quick ride and noticed when in turns the front end wants to turn to follow the line rather than stay relatively stationary (essentially its countering the countersteer). Almost felt like it wanted me to pull instead of push the handle bars. (kind of like the feeling of a low front tire but times 10) He hasnt noticed but its his first time out on it and since i have the exact same bike it was very noticeable to me. Anybody have an idea of what could do this? (bent forks, misplacement of the handle bars, warped tires, etc. yea im digging for answers lol)

air pressure good from and rear.
Back tire is in alignment.
Bike will follow a straight line if the riding no handed.
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post #2 of 36 (permalink) Old 06-25-2006, 01:51 AM
 
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If it were my guess I'd say a possible bent fork(s). It really doesn't take much to bend one. It can be unnoticable to the naked eye, but if he were to get it checked out I bet it's off by a few mm.
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post #3 of 36 (permalink) Old 06-25-2006, 02:19 AM Thread Starter
 
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Thats what I was thinking but Im hoping not since he just bought it.
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post #4 of 36 (permalink) Old 06-25-2006, 08:35 AM
 
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an 03 so the bike is used? tire in good condition (uneven wear)? forks level in the triple tree?
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post #5 of 36 (permalink) Old 06-25-2006, 09:39 AM
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I'm thinking that maybe the tire is worn unevenly also. The pressure could be good now but if it was ridden low for a while then it would wear really bad. Also check for pop knots.

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post #6 of 36 (permalink) Old 06-25-2006, 12:07 PM
 
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Most of these tests have to be done with the bike fastened to a centerstand. Wheel bearings worn, especially on one side. Steering head bearing adjustment too tight, or bearings worn. Steering stem bent (usually after impact). Swingarm bearings worn or too tight. Preload or other adjustments in the forks not even on both forks. Front forks twisted (have to loosen all the clamp bolts, wheel axle, and fender bolts, then realign, and tighten from the axle upwards).
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post #7 of 36 (permalink) Old 06-25-2006, 12:23 PM
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Yeah I would think it would be either un-level forks in the tripples or the forks twisted a bit in the tripples. Either way loosen them up and make sure they are right.. that will eliminate that as a possible problem.




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post #8 of 36 (permalink) Old 06-25-2006, 03:02 PM
 
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He's got matching tires?
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post #9 of 36 (permalink) Old 06-25-2006, 03:32 PM
 
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check for steering head bearing free play. when accelerating, let off on the throttle and feel for any looseness or free play on the steering head. Also, try coasting at low speed with clutch in and lightly pulsate the front brakes and feel for movement.

i would also put it up on a front stand, loosen up the tripple clamps holding the forks and then realign the forks. this will be a good time to raise the forks up the clamps about 1/4 inches. this will quicken the steering and reduce the tendency for the bike to stand up while leaning. unfortunately, this will also quicken low speed turning. most newbies will feel uncomfortable with this.

a bad front tire will also cause those symptoms.

if you find that the steering head is lose, I will explain in detail how to replace them (this is common for wheelie riders).

-a|ex
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post #10 of 36 (permalink) Old 06-25-2006, 10:03 PM
 
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A good point was made above! Tell dave to take the suspension all back to factory settings and that includes all of it, then have him adjust accordingly!
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post #11 of 36 (permalink) Old 06-25-2006, 10:34 PM Thread Starter
 
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Thanks for the input. I am gonna have him bring his bike over this week and start with the easy stuff and work my way up. You know same tires, suspension back to factory, etc.

BTW Back_Marker when u say steering head bearing play what exactly are you refering too? I wanna be sure Im looking and feeling for the right things.
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post #12 of 36 (permalink) Old 06-25-2006, 11:13 PM
 
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the big nut in the middle of the tripple clamp. underneath it lays the steering head bearings. those that land hard on wheelies continuously will wear those bearings out. Also, loose from the factory will get worst during time. unfortunately, you cannot test the freeplay if you have a steering damper installed.

don't ever buy OEM bearings. Just get the bearing numbers and call your local auto parts store or mail order bearing store.

but like i mentioned, bad tires will also cause those symptoms. it may not be externally visible. also, while the bike is on a front stand, spin the front wheel and check it's alignment. it should spin freely. take notice of the rotors and calipers for excessive drag.

-a|ex
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post #13 of 36 (permalink) Old 06-26-2006, 04:13 PM
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Uo1... check out this thread and do what they suggest for your suspension settings. It is the best place to start and will help the bike handle better than the stock settings!

Sport Rider Suspension Setting




-Chris
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post #14 of 36 (permalink) Old 06-26-2006, 11:38 PM
 
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If it has dual fron brakes be sure one side isnt trying to stick it will cause drag in turn putting a slight twist to the forks. And also try to stand the bike up in a turn. Make sure both calipers are releasing.
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post #15 of 36 (permalink) Old 06-26-2006, 11:55 PM
 
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Quote:
Originally Posted by Earlzach
If it has dual fron brakes be sure one side isnt trying to stick it will cause drag in turn putting a slight twist to the forks. And also try to stand the bike up in a turn. Make sure both calipers are releasing.
I went over that with him on the phone the other night...he said it wasn't that.
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post #16 of 36 (permalink) Old 06-27-2006, 11:19 PM Thread Starter
 
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Last night we discovered that one of the forks is lowered slightly more than the other fork. Tryin to describe it the threads that come out of the top: the left fork is at about 3.5 threads down and the right is at 4.1ish. Anybody with a RR knows the spacing Im assuming its about a 1/8 to 1/10 difference. He didnt come to my house to fix that but Im guessing that could be causing some of the issues. Hopefully if it doesnt rain tomorrow I can work that out and then start the other stuff.

Ill def check out the suspension page Gas Man. Ill even try to help mine out a bit more.
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post #17 of 36 (permalink) Old 06-27-2006, 11:47 PM
 
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Quote:
Originally Posted by 600RR Uo1
Last night we discovered that one of the forks is lowered slightly more than the other fork. Tryin to describe it the threads that come out of the top: the left fork is at about 3.5 threads down and the right is at 4.1ish. Anybody with a RR knows the spacing Im assuming its about a 1/8 to 1/10 difference. He didnt come to my house to fix that but Im guessing that could be causing some of the issues. Hopefully if it doesnt rain tomorrow I can work that out and then start the other stuff.

Ill def check out the suspension page Gas Man. Ill even try to help mine out a bit more.
Since I know you have a manual for your bike, and I'm not sure if Dave does or not....read the suspension section! This will tell you what your FACTORY SETTING ARE!!!! Adjust the whole front suspension back to factory settings!!! You will be supprised how well the bike actually rides at that point. Also you can fine tune from there....you will also be supprised your fine tune will be very CLOSE to the factory settings!

I played with mine when I first got the bike, and messed with it, and thought I had it set...nope, I went back to oem settings, then made little tweeks....its only a few clicks from oem....and the bike rides perfect! well...you know...you've seen how the bike handles on the dragon and skyway.
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post #18 of 36 (permalink) Old 06-28-2006, 04:38 AM
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Uo1..just as we said from the begining... it don't take much to effect the bike. There is a reason why they measure that stuff in mm.




-Chris
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post #19 of 36 (permalink) Old 06-28-2006, 06:19 AM
 
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Quote:
Originally Posted by Gas Man
Uo1..just as we said from the begining... it don't take much to effect the bike. There is a reason why they measure that stuff in mm.




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post #20 of 36 (permalink) Old 06-28-2006, 12:34 PM
 
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I'll be there this weekend to make sure they adjusted accordingly.
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