I have a 1992 Yamaha Exciter 570. I was wondering if this sled should have the decompression cable? I thought I remember these sleds having this when they came out in the late 80's? I tried doing a compression test but I've read that you should have the throttle wide open is this correct because I'm only getting 90 psi on each cylinder but this sled had sat for 4 years and pulls over hard so I'm debating on rebuilding the motor. Any help would be greatly appreciated.