1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 45Get this manual
ENGINE SERVICING (TVVIN CYLINDER) Engine Installation
1Position the engine on the front end assembly and secure in place with the right front locknut and the outside two (2) locknuts at the left front side of the engineAlso, replace the two (2) flat washers and locknuts that retain the rear of the engineSlide locking collar to the base of the steering post and secure in position with an Allen wrenchConnect the inlet fuel line and the vapor return line at the carburetorOn electric start models, perform the following: A) Connect the positive+battery cable (red) and the solenoid wires to the starterConnect the regulator rectifierConnect the negative) battery cable (black) to the negative) battery terminal