2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 229Get this manual

2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 229

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6.Inspect: Diaphragm (coasting enricher) Spring Cover Tears (diaphragm)damage Replace
7.Inspect: Jet needle Main jet Needle jet Pilot air jet Pilot jet Pilot screw Starter jet S