If your referring to Suzuki GS550L. According to a NGK master catalog I have a 198e Gs550, Standard plug is a NGK D8ES, Gold tip NGKD8EV and Platinum NGKD8EVX
All gapped ar .028
.028 to .035 according to spark plug brand.
The spark plug gap for a 1983 Ford Ranger 2.8L is .044"
If the car has the 2.5L 4 cylinder engine the spark plug gap is 0.060". If the car has the 2.8L V6 the spark plug gap is 0.045"
.35
.028
At least one spark plug manufacturer (NGK) recommends a gap of .028" for a 1983 Suzuki GS550 (this is for the D9EA spark plug). Interesting to note, a 1982 Suzuki GS550 uses a different plug (B8ES), and the gap for that one is .032". So if you have a 1983 model, that gap should be .028".
it is 0.80mm
A diesel engine doesn't have spark plugs or spark plug wires.
The required spark plug air gap for the 83 model, 15 hp Johnson is .030 in.
Dr8es-l
.045"
.035 gap