I have a 1994 Arctic Cat Cougar snowmobile. I got it from a friend who hasn't used it in 10 years. The engine runs fine, but the clutch won't engage. I took off the primary outer cover and then removed the spring, but the primary clutch only moves about a half an inch. I have tried spraying kroil penetrating oil on it but that doesn't seem to help. It has a fair amount of rust on the shaft too. Any thoughts? If possible, I want to avoid taking the clutch off. Thanks in advance.