The bike is great on grippy stuff but spins up too easy on anything slippery.  Any advice on adding base gaskets or preferably retarding ignition.  Bike is as standard.

Any help appreciated.

 

Head spacer or flywheel weight.

I had the same problem when I first ride my ST, I was looking at the same solution ( timing and gasket ) but I end up gettind a 2t smaller rear sprocket since then, I never had any problem. Don't throw rock at me, I know it sound like I aggravated the problem but it worked for me.

Guy

Now you can throw rock at me: I ended up replacing the 42t  by a 44t witch made the bike fun to ride.