When my bike ('09 SG) has been run for a while, I can shift from Neutral into 1st gear and no clunk or other noise is heard. When it's cold, the famous clunk is present. I'm running Amsoil 75/90 gear oil. Normal???

 

yes, your trans is working great. i did the change over to synthetic in the trans with royal purple 75-140 and couldn't be happier. shifts as well as a jap bike, and that's saying a lot. it does clunk when cold, and i think that has more to do with the clutch releasing fully due to the primary lube not being warm enough to release the clutch totally. this new synthetic stuff rocks.

 

synthetic is the way to go also great in the motor and primary-ride safe

 

I used Amsoil for a year and then switched to Redline. The Redline is much "stickier" for lack of a better term. Cold shifting is much quieter. Yes, the Amsoil is good but the Redline is superior IMO.

 

you can also change your primary tensioner helps with the clunk-ride safe