The cover is not magnetically bonded to the engine.you have to remember that the cover is magnetically bonded to the bike... i don't know what all of this abrasion and coating would do to that relationship. 90 and 140??? What kind of bike are we talking about here? My 2008 Blade has Woodcraft I bought new for 70 (Stator). OEM I can get for around the same price. You may find one on ebay or craigslist for less. Just have to do a little hunting.