Go Back   Two Wheel Fix > Riding > Street

Reply
 
Thread Tools Display Modes
Old 05-20-2009, 02:49 PM   #1
Rider
Moto GP Star
 
Join Date: Feb 2008
Posts: 12,156
Default DR650 turned into SM, now has a problem

One of my coworkers has a Suzuki DR650 that he turned into a SM. He took off the 21" front wheel and put a 17" front wheel on it. Now he is experiencing what he is calling a "tank slapper" like condition when he gets to about 70mph. He cant figure out why. I'm guessing that by going to the smaller wheel, he essentially lowered the front of the bike 2 inches and has fucked up the steering geometry. Anyone have any thoughts on what is wrong? Forks are bad? Wheel is bent? It doesn't have any problems below 70mph.
Rider is offline   Reply With Quote
Old 05-20-2009, 02:52 PM   #2
dReWpY
RIP REX
 
dReWpY's Avatar
 
Join Date: Feb 2008
Location: Murfreesboro, TN
Moto: 2008 1125R
Posts: 7,467
Default

sounds like wheel balance issues
__________________

Venom R1-016 Squadron
Quote:
Originally Posted by Trip View Post
Moral of this story is everyone is fucked up no matter atheist or religious.
dReWpY is offline   Reply With Quote
Old 05-20-2009, 02:57 PM   #3
Rider
Moto GP Star
 
Join Date: Feb 2008
Posts: 12,156
Default

Quote:
Originally Posted by drewpy View Post
sounds like wheel balance issues
A wheel out of balance would cause the tire to rotate out of round(up and down) but he is getting the handle bar to shake side to side. Would off balance tires cause a side to side shake?
Rider is offline   Reply With Quote
Old 05-20-2009, 02:58 PM   #4
dReWpY
RIP REX
 
dReWpY's Avatar
 
Join Date: Feb 2008
Location: Murfreesboro, TN
Moto: 2008 1125R
Posts: 7,467
Default

how tight are the spokes? they might need adjusted or maintained
__________________

Venom R1-016 Squadron
Quote:
Originally Posted by Trip View Post
Moral of this story is everyone is fucked up no matter atheist or religious.
dReWpY is offline   Reply With Quote
Old 05-20-2009, 03:00 PM   #5
Rider
Moto GP Star
 
Join Date: Feb 2008
Posts: 12,156
Default

Quote:
Originally Posted by drewpy View Post
how tight are the spokes? they might need adjusted or maintained
It was a brand new rim installed by a Suzuki dealer. Spokes should be tight.
Rider is offline   Reply With Quote
Old 05-20-2009, 03:03 PM   #6
dReWpY
RIP REX
 
dReWpY's Avatar
 
Join Date: Feb 2008
Location: Murfreesboro, TN
Moto: 2008 1125R
Posts: 7,467
Default

i would check the balance out first, if its off the affects would be magnified by the increased speed, or possibly the bearings in the steering stem could be bad
__________________

Venom R1-016 Squadron
Quote:
Originally Posted by Trip View Post
Moral of this story is everyone is fucked up no matter atheist or religious.
dReWpY is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 05:49 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.