So after spending an hr+ last night eventually getting what my state considers vintage snowmobiles running. Spent over an hr on a old skidoo 500 with a shady tree backwoods 136" track conversion. Anyways couldn't get that thing running, checked spark, good to go, so fuel problem, ended up changing out primer, replacing spark plugs anyway, half the fuel lines with new tygon ones,
, about to remove carbs and do a compression test when I finally realized I shut off the fuel valve last year turned it on, and voila runs like a 29 yr old snowmobile should.

Figure that's definitely a stupid thread worthy revival.