Hi, I've recently bought my first sled, a summit 700 from 2000, really fun snowmobile but it's taken a lot to get it running right. It's almost perfect now but i've got a problem with it bogging down when i go really fast, I can pin the throttle and it accelerates fine, but when I get to around 7k rpm it's like I hit the kill switch and I loose speed and then it comes back, if i just let off the throttle a little it picks up again. I suspect it might be the belt overheating and slipping but I don't really know what that feels like. I did have problems with my old belt slipping because it was worn out and it felt kinda the same but at lower rpm. The belt i've got right now is a 417 300 127 but the specs says it should be a 417 300 128. I've got a clutch kit on as well if that makes a difference. Any help is appreciated.