Polaris 2001 High-Performance Snowmobile Service Manual (PN 9916690), Page 59Get this manual
ENGINE Choose well known performance companyExplain that you need reliable enduro engine, not sprint motorAn enduro engine should not exceed 9800 RPMSprint motors are too "peaky" and have short lifeRemember, the race is won at the finish line, and most high horsepower engines don't get thereIf the track or course requires running long distances in limited snow conditions, it is advisable to install temperature gauge to monitor coolant out temperatureSecure the fuel valve in the "on" position with cable tie strapThis will prevent the valve handle from moving when operating in rough conditions
Front Engine Mount
Accelerated wear of the rubber engine mounts may be caused by rough surface on the holes of the front engine mount plateBurrs in the holes of the engine mount plate will reduce the service life of the rubber mount, and increase the amount of engine movement under loadInspect the mounts for wear periodically and replace as necessaryThe holes in the plate and the area of the rubber mount should be deburred and polished if necessary