MAINTENANCE
2.18
COMPRESSION TEST
NOTE: 4-Stroke engines are equipped with an automatic decompressor. Compression readings will vary in pro-
portion to cranking speed during the test. Average compression (measured) is about 50-90 psi during a compres-
sion test.
Smooth idle generally indicates good compression. Low engine compression is rarely a factor in running condition
problems above idle speed. Abnormally high compression can be caused by a decompressor malfunction, or
worn or damaged exhaust cam lobes. Inspect camshaft and automatic decompression mechanism if compres-
sion is abnormally high.
A cylinder leakage test is the best indication of engine condition on models with automatic decompression. Follow
manufacturer’s instructions to perform a cylinder leakage test. (Never use high pressure leakage tester as crank-
shaft seals may dislodge and leak).
ENGINE MOUNTS
Inspect rubber engine mounts (A) for cracks or damage.
FASTENER TORQUE - ENGINE
Check engine fasteners and ensure they are tight.
Cylinder Compression
Standard
50-90 PSI
Cylinder Leakage
Service Limit
10 %
(Inspect for cause if leakage exceeds 10%)
A
A
A
Summary of Contents for Sportsman 400
Page 6: ...SPORTSMAN 400 A01CH42AC GENERAL INFORMATION 1 4 MODEL COLOR IDENTIFICATION ...
Page 21: ...Newton Meter to Pound Foot and Pound Inch GENERAL INFORMATION 1 19 TORQUE CONVERSIONS ...
Page 22: ...Newton Meter to Pound Foot and Pound Inch GENERAL INFORMATION 1 20 TORQUE CONVERSIONS ...
Page 152: ...Forward FUEL SYSTEM CARBURETION 4 2 FUEL TANK ASSEMBLY ...
Page 366: ...ELECTRONIC SPEEDOMETER WIRING DIAGRAM ELECTRICAL 10 32 ...
Page 372: ...ELECTRICAL 10 38 NOTES ...
Page 379: ...ELECTRICAL 10 39 WIRING DIAGRAM 2001 SPORTSMAN 400 ...
Page 380: ...ELECTRICAL 10 40 WIRING DIAGRAM 2001 SPORTSMAN 500 EARLY ...
Page 381: ...ELECTRICAL 10 41 WIRING DIAGRAM 2001 SPORTSMAN 500 LATE ...