I’ve broken one 661 cover but to be honest I should have changed my chip deflector long before I broke the cover.
What I find weird is all the guys talk about how often they derail the chain on the 500i, an excessive amount resulting in smashing these covers. At first I assumed operator error, not maintaining equipment, etc…. You know the usual *s-word that guys have a habit of not doing. But then my falling partner who I’ve cut with for years used his new 500i for 16 days before smashing the back out of the cover and complained the whole time about the chain derailing. He then got angry and went back to his trusty 461 and haven’t had an issue since, same bar and chain.