heres the problem upon first start up after winter storage cannot get the sled to stay running without using the primer to keep it going. though it might be dirty carbs so took them apart cleaned them and the same thing occured. also oil comming of exhaust. did not think it was bad gas because my mxz runs fine. I think it might be a fuel pump gone bad. need help and snow. p.s ran fine before it was put away thanks .