It this an issue only with the 4 strokes, or are the 800 etec chaincase also vulnerable?The problem with the case is it can be cracked by the adjuster while in reverse. If you stop suddenly while in reverse or hit the brake hard it puts a lot of force on the adjuster. All that force on the chain is transmitted to what I think is a very fragile part of the case. Guys should be very careful when using reverse and do it slowly without any sudden jolts. I think this is a poor design by Doo.
All,you need to do is take the cover off the chain case and look at the chain and the adjuster. When going forward all the stress is on the chain as its fully stretched. When going in reverse all the stress is where the chain wraps around the adjuster and the adjuster will take the hit instead of the chain. I would bet if going in reverse fast and suddenly stopping hard when the track hits the snow flap you could crack the case.It this an issue only with the 4 strokes, or are the 800 etec chaincase also vulnerable?