I´ve owned this 90 750 for 3 yrs. and did some reading on it. It says in 90 they went back to 749cc´s, the sticker under the seat on mine says 748cc´s. the title says 1990 but the vin. Plate says mfd. in 12/89. Could it be an 89 engine with 90 body work. I´m confussed. Can anyone please explain this