1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 112Get this manual
AIR FILTER CLEANING Air filter element Air filter element cap
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Never operate the engine with the air filter element removedThis will allow unfiltered air to enter, causing rapid wear and possible engine damageAdditionally, operation without the filter element will affect carburetor tuning with subsequent poor performance and possible engine overheating3.1nspect: Air filter element Damaged -7 Replace