1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 225Get this manual
ENGINES 1985 Engine Specifications
Machine Model Scrambler Trail Boss Engine Model Cyl.DispCC's MM Bore Inches Stroke MM Inches Piston Ring 21.5mm Keystone Ring End Gap InPiston Clearance Total In.0014 to .002S new Engine Operating RPM 6000
EC25PF-01
.OOS to .016
1985 Carburetor Specifications
Engine Model EC25PF-01 Carburetor Type VM30SSZinc Main Jet Size Pilot Jet Size 30 Air Screw Adjust 12 Jet Needle NumberClip Position 5DP7-3 Needle Jet 0-6 (169) Throttle Valve Cutaway 2.5 Engine Idle RPM SOO
1986 Engine Specifications
Machine Model Scrambler Trail Boss Engine Model Cyl.DispCC's MM Bore Inches Stroke MM Inches Piston Ring 21.5mm Keystone Ring End Gap InPiston Clearance Total In.0014 to .002S new Engine Operating RPM 6000
EC25PF-01