I am a new first time owner of a 1969 ct90. It runs great and I want to keep that way. Just found this forum and looking for a few answers. I read that my 90 has an oil screen. Does that need cleaning as part of each oil change? How is that done best done and how do I get at it? Assume i have to take the cover off and will that require a gasket replacement? Sorry if this answer is already posted, tried the forum search and did sot see it. Many thanks