2003 Polaris MSX 140 Personal Watercraft Service Manual, Page 26Get this manual
Maintenance Engine Engine Mounts
Check tightness of all engine mounts including bolts that secure mounting plate to engineInspect rubber mounts for cracksTighten or replace if necessary
Compression Test
A compression test is good indicator of engine conditionFor accurate readings, use high quality gauge and make sure the battery is in good condition and fully charged
Compression Gauge PN 2870852