Kitty Cat Snowmobiles

Simple question, but just bought my Son a 87 Kitty cat, not sure if it is the Suzuki or the Kawa engine. Never had a premix before and want to confim if the mix is 50/1? Also, is using injector oil from my other sleds aceptable or should I be buying premix oil?

Thank you,

An 87 would be a Suzuki (Spirit) motor. 50:1 will work, I would go 40:1. Any old 2 stroke oil is fine, including your injector oil.

Thanks so much, with a 4 yr old and 9 month old, hope to have this for years to come