1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 95Get this manual
CARBURETION (TILLOTSON) Full Throttle Operation
As the throttle valve opens progressively further from part throttle operation, the air velocity through the venturi increasesAt full throttle operation, fuel is metered up through the main adjustment screw orifice and main fuel discharge portNOTE: engineFuel demand is governed by the power load of the The action of the main diaphragm is the same as previously described, with suction required to operate the diaphragm being transmitted through the main fuel discharge portNOTE: The primary and secondary idle discharge ports deliver relatively little fuel at full throttle operationMost of the fuel deliverance is supplied from the main fuel discharge port