Join Date: Mar 2008
Location: Kapuskasing Ontario Canada
Mentioned: 6 Post(s)
Yeah your chain is shot... 2" of slack variation is absolutely excessive. Mine did the same from the start, and I had to replace it at 2600 miles.
Replace both sprockets and chain ASAP.
From the service manual:
(Last part doesn't make sense. You can't install an endless chain without cutting the swingarm, in which the chain is looped. New chain needs to be installed with riveted main link.)
-Drive Chain Wear Inspection
•Remove the chain cover (see Swingarm Removal in the Suspension chapter).
•Rotate the rear wheel to inspect the drive chain for damaged rollers, and loose pins and links. If there is any irregularity, replace the drive chain. Lubricate the drive chain if it appears dry.
•Stretch the chain taut by hanging a 98 N (10 kg, 20 lb) weight on the chain.
•Measure the length of 20 links on the straight part of the chain from the pin center of the 1st pin to the pin center of the 21st pin. Since the chain may wear unevenly, take measurements at several places. If any measurements exceed the service limit, replace the chain. Also, replace the front and rear sprockets when the drive chain is replaced.
Drive Chain 20-link Length
Standard: 317.5 ∼ 318.2 mm (12.50 ∼ 12.53 in.)
Service Limit: 323 mm (12.7 in.)
If the drive chain wear exceeds the service limit, replace the chain or an unsafe riding condition may result. A chain that breaks or jumps off the sprockets could snag on the engine sprocket or lock the rear wheel, severely damaging the motorcycle and causing it to go out of control. For safely, use only the standard chain. It is an endless type and should not be cut for installation.