It would be a Formula SS with a 462cc L/Ctnt_fa said:I was at the local swap meet and a guy has an older skidoo for sale. He thought it was a t'nt which is is NOT. I thought it was a formula sp but it doesn't have the MX style shocks on it. The model number is 3613 and it is liquid cooled single carb. I think it is a 462cc but he says it is a 585cc *%@ mate LOL
I have a 1985 with the same model number.