8N8 is the year/model designation. The rest are serial # for that model/year starting with (usually) 000101.
An 8N8 is a 1982. The track is a 116X 2.52.
That track was used on 76-81 Exciter's, 78-80 SRX's, Phazer I's (first gen Phazer) and a couple of others. Hard to find in good used condition.
SS440 was a great sled. Quick, nimble, light and handled very well on smooth trails. Top speed, 80, 85ish in good conditions. It was the same chassis as an SRV with leaf springs in front, less suspension in the rear and a smaller CC version of the same engine.
They are tons of fun in a "low, get it to go" way. Normal for their day but lacking in the "cush" department for todays candy assed/backed riders.
Never owned one but rode and liked them.
Great sled!!
opsled