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Junior Member
Joined: Jun 2006
Posts: 5
?
any ideas would be helpful. i crash my bike against a curb was doing bout 20 when a car came around the corner at my apt. complex. i when to ride the bike the other day and the front end wopples up and down as if there was a flat spot on the tire or bend rim. but i cant see that the rim is bend. also i im low on fork fluid and not sure how low.( if that could cause the front end to do that) another ? is when i get into 3rd it kinda bogs and i cant go faster then 40mph. it just bog. any idea why the front wopples and motor would bog. thanks
Super Moderator
Joined: Jun 2005
Posts: 7,044
From: So Cal
RE: ?
Sorry about the wreck. May be forks are the wobbly problem; check the alignment between the front tire and the rear. Here is a crude but effective way to check. Sorry no picsâ€
You need a rear stand or some on to hold the bike up right Take a string and run it through the rear wheel and wrap it around the back of the rear tire.
Now bring both ends of the string along side of the rear tire and about 6’ past the front of the bike. Find a object that you can tie the both ends of the string too, I have used a chair before one with a rail or a horizontal brace that the string can be attached to.
You \need to keep the strings at the same level not one higher os lower than the other. It is helpful to be able to slide the strings left and right on what ever you use to tie them off. They should be pulled snug.
Now move the strings away from each other until the no longer are touching the front of the rear tire, this is where the bike needs to be up right and as straight as possible. Now move one string at a time closer to the other just until the string makes contact with the front of the rear tire, import thing here is just making contact and not putting to much pressure on it or it will through off the measurements. Now do the same to the other string,
Now you have two straight lines running up the sides of your bike of the rear wheel. With the front wheel turn straight measure the distance between the string and the front wheel in the 4 places where the strings pass by the wheel. Are they equal? They should be for a properly aligned bike.
If the strings are to close to the front tire to get a good measurement than find f our equally sized objects that can be placed, secured with tape, to the rear wheel and run the string over them to move the string further apart, now allowing for a better measurement.
Post back your findings and we can go form there.
You need a rear stand or some on to hold the bike up right Take a string and run it through the rear wheel and wrap it around the back of the rear tire.
Now bring both ends of the string along side of the rear tire and about 6’ past the front of the bike. Find a object that you can tie the both ends of the string too, I have used a chair before one with a rail or a horizontal brace that the string can be attached to.
You \need to keep the strings at the same level not one higher os lower than the other. It is helpful to be able to slide the strings left and right on what ever you use to tie them off. They should be pulled snug.
Now move the strings away from each other until the no longer are touching the front of the rear tire, this is where the bike needs to be up right and as straight as possible. Now move one string at a time closer to the other just until the string makes contact with the front of the rear tire, import thing here is just making contact and not putting to much pressure on it or it will through off the measurements. Now do the same to the other string,
Now you have two straight lines running up the sides of your bike of the rear wheel. With the front wheel turn straight measure the distance between the string and the front wheel in the 4 places where the strings pass by the wheel. Are they equal? They should be for a properly aligned bike.
If the strings are to close to the front tire to get a good measurement than find f our equally sized objects that can be placed, secured with tape, to the rear wheel and run the string over them to move the string further apart, now allowing for a better measurement.
Post back your findings and we can go form there.
Super Moderator
Joined: Jun 2005
Posts: 7,044
From: So Cal
RE: ?
ORIGINAL: tex636
An easier way to check alignment is to get ahold of some flourescent lights (like used in offices, the long ones) use some rubberbands to put tension on them on either side of the rear tire.
An easier way to check alignment is to get ahold of some flourescent lights (like used in offices, the long ones) use some rubberbands to put tension on them on either side of the rear tire.
Senior Member
1st Gear Member
Joined: Jun 2006
Posts: 5,762
From:
RE: ?
ORIGINAL: tex636
An easier way to check alignment is to get ahold of some flourescent lights (like used in offices, the long ones) use some rubberbands to put tension on them on either side of the rear tire.
An easier way to check alignment is to get ahold of some flourescent lights (like used in offices, the long ones) use some rubberbands to put tension on them on either side of the rear tire.
Senior Member
1st Gear Member
Joined: Mar 2006
Posts: 4,242
From: Keller (DFW), Texas
1st Gear Member
RE: ?
I used NS's method but with jackstands to tie the string to. The flourescent tubes are a good idea also but you gotta be careful. A couple of laser pointers or laser measuring device may work also. You can also loosen your top triple clamp bolts, Steering stem nut & front axle and re-align the forks. Do not loosen the lower triple clamp or the forks will slide up! Put in on a rear stand, Grab the front brakes and bounce the front end up and down several times while straddling the bike, then let it up easy, and tighten it all down. Unless the forks or triple clamps are bent, this should line everything back up. If you have a front stand, rotate the front wheel to check for a flat spot or bend. If none are found, have your wheel computer spin balanced.
