Does anyone know how to decode the "VIN" on the engine itself? I need to know what year it is. I know my frame is an 1986 but i think the engine may be newer (87-89). The "VIN" on the engine is not 17 characters like a normal VIN, its only approx 10. I am thinking it may be newer than a 1986 because i have an old LT250R manual that i sometimes double check things with when im working on the engine and it says that the pre-1987 models do not have the window to view the exhaust valve adjuster. I need to know for sure what year engine it is to order parts