To deal with removal of rubber mount-inserts on engine, I recommend getting set of FOG's solid motor-mounts. Then welding them to engine. This really simplifies mounting to frame without having to deal with wobbly factory rubber inserts that throws off measurements. Solid mounting also maintains stock 250 quick-handling and maneuverability since engine is used as stressed-member.
Stock EX500 uses rubber-mounting with thin perimeter-frame... wet-noddle. Many people converting over to solid-mounts report much-improved handling.
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