Hello Hoovey,
As you can see by reading the old and new threads, there has been some pretty sad problems with the Rockets engines. It is my opinion to stay away from '04 / '05 bikes. Some say late '06 to '08 "should" have better odds of getting a trouble free bike. So far I haven't had any trouble with mine. I bought a new '06 standard built in spring '06 with a black engine. Some think the black engines are better. I really don't know. I bought a 6 year extended warranty with mine just to have peace of mind.