So with a 250hp turbo what maintenance items should be done more often.... I end up riding about 1000 to 1500 miles a season. I replace the belt every season.... Should the chain be replaced also every season...
It wouldn't hurt to replace the chain, if nothing else for the peace of mind. I would clean your clutches, and check the jackshaft berings. Other than that, lube the zerks on your suspension and you should be good to go.
Spark Plugs every two seasons(2000-3500 miles). Cheap and easy saves trouble shooting a problem later when a plug goes bad or having it rip all the threads out of the head when it seizes in.