The -1 swinger is for some and not for others. To say that its for guys racing blasters and 250s is just ignorant! I just switched from a -1 to a +6 and I hate it. It feels like I'm driving a dam bus around. It helps keep the front end down, but that is on the only positive thing about it. Trail riding sucks, turning sucks, jumping sucks and overall handling sucks. If you plan on trail riding at all, I personally wouldn't go with anything longer than a +4. With the motor your building, I wouldn't hesitate at all to try a -1. Once you get the hang of riding a -1, you'll never go back. I was forced into a longer swinger due to a crazy ass new motor.