1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 226Get this manual
ENGINES 1988 Engine Specifications
Machine Model T.B.2x4 T.B.4x4 T.BRES Engine Model CylDlspCC's MM Bore Inches Stroke MM Inches Piston Ring 21.5mm Keystone 21.5mm Keystone Ring End Gap InPiston Clearance Total In.0014 to .0028 new .0014 to .0028 new Engine Operating RPM 6000 6600
EC25PF-03 EC25PF-04
2.835 2.83
2.362 2.362
.008 to .016 .008 to .016
1988 Carburetor Specifications
Engine Model EC25PF-03 EC25PF-04 Carburetor Type VM30SSZinc VM38SS Aluminium Matn Jet Size Pilot Jet Size 35 45 Air Screw Adjust 1.5 Jet Needle NumberClip Position 5DP7-3 6DH4-3 Needle Jet 0-4 (169) 0-2 (247) Throttle Valve Cutaway 2.0 (Chrome) 3.0 (Chrome) Engine Idle RPM 800 800
1989 Engine Specifications
Machine Model Trail Boss T.B.2x4 T.B.4x4 T.B.4x6 Engine Model EC25PF-05 CylDlspCC's 244 Single MM 72 Bore Inches 2.835 Stroke MM Inches 60 2.362 Piston Ring 21.5mm Keystone Ring End Gap In.008 to .016 Piston Clearance Total In.0014 to .0028 new Engine Operating RPM 6000 +1- 200
1989 Carburetor Specifications