mun,
You have right there
(THE expert of 1986 model (68rwhp)
1986-88.One big "no move"main exhaustport with two big "moves"subexhaustport.
1989- One smaller "moves" main exhaustport with four smaller "moves" subexhaustport
Also another inlet style 1986-88 ,but same reedcage.
(mun,you know I buy your bike anytime)
//doordie