This machine has been trouble free for 19 years. Now when I hit the starter, I hear something spinning but engine is not turning over. I don't know if the problem is the starter bendix or the flywheel. I guess I'm going to tackle this problem but was looking for help before I start. Any thing I should try before I take off the flywheel cover? Does the exhaust have to come off first? Can the cover and flywheel be removed in the machine? Thanks for any tips.