Hi,
Thee differances between 3AJ-1988 and 3AJ-1989 are;
The oil cooler; bigger size by one third on 1989
Geearbox demultiplication of engine torque; the gearbox inner wheels etc are the same on 1988 & 1989 they are all improved compared to the 1VJ model, though on 1989 the clutch wheel has another demultiplication and sends less torque on the wheels in gearbox...then to compensate this the drive chain gives more torque to the back wheel.
If you have a 1988; you can buy a drive chain kit for 89 and the clutch wheel if you manage to find it, I think you can buy the 660 one cause it is the same as last 3AJ, but I'm not sure 100%.
Last big differance is just esthetic; engine is painted in grey on last 3AJ and black on first.
Suspension is the same 255/235 and solid kayaba as fork.
Now I'm heading for the garage to work on my sweetheart,
Cheers
Matt
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