chain keeps coming loose

[Blueman]

Ok so first I have the stock chain. I was changing the front sprocket from a 15t to a 14t. My rear sprocket is the stock 39t. I loosened the castle nut, then tightened both adjusters equally. After it was tight enough I tightened the castle nut nice and tight. The bike was on the side stand. After I was done I put it on the center stand and washed it. Then put it back on the side stand.  thats when I noticed that the chain was completely sagging and lose. My chain only has 7500 miles on it so I dont think its worn out. I lube it regularly. I tightened it again and rode it. Sure enough 5 minutes of riding and the chain is pretty loose again. I feel like something is wrong with either my castle nut or one of the adjuster nuts. If I cant fix it myself I might have to go to the dealers to get it looked at. Anybody know what could be wrong?  Oh my tire is far back in the swingarm.

[Soloratov]

Always adjust the chain on the center stand. The wheel needs to be off the ground.

How did you tighten it? Just wrench it? GET A TORQUE WRENCH. You might be really surprised how much tighter it needs to be after seeing how much torque 60ft-lbs is. Also, check to be sure the adjuster nuts, they should be tight as well.

[Janx101]

Yeah +1 to torque wrench. .. 60lbs is a fair bit on standard length tools! , torque wrench is also longer which helps with applying pressure!

[gsJack]

I never torqued a rear axle nut for decades and never had a problem.  Then one day I found my wheel had slipped out of place and I tightened it again and it slipped again and when it still slipped once again I tightened it with torque wrench.  On the road locally the rear wheel all of a sudden was locking up with a bad wheel bearing.  I got it freed up and got home and took it off and discovered spacer #9 was missing.  It had been lost when the cush drive was removed for a tire change.  Take off your wheel and pull out spacer #10 and check.  You can see  spacer #9 inside the cush bearing if it's there, If not replace all wheel bearings and spacer #9.  When spacer #9 is missing tightening the axle nut puts a heavy side load on the left wheel and cush bearings.

http://www.shspowersports.com/fiche_image_popup.asp?fveh=2102&section=92708&year=2001&make=SUZUKI&category=Motorcycles&dc=3378&name=REAR+WHEEL

[ace50]

.

[Soloratov]

Good call Jack...my bike was missing one of the spacers when i got it as well...ended up blowing a bearing to pieces. Made the new spacer on the lathe and yeah...WAY better.

[Blueman]

Ill take it apart and look at it. Thanks for a link