Merryman, the 87-88 models had 428 pitch chain with a 12/26 sprocket combo.
The 89 and up models are 520 with 10/22 sprockets.
It will be slack. Uncofortably slack by any mechanics standards.
Suzuki went from the 428 to the 520 because of this.
The 520 is slightly tighter and suprisingly doesn't have much issues.
Prolly should have got the rear sprocket too.