Honda FR600 Owner's Manual page 27

.
Problems That May Affect Emissions
If you are aware of any of the following symptoms, have your engine
inspected and repaired by your servicing dealer.
l
Hard starting or stalling after starting.
l
Rough idle.
l
Misfiring or backfiring under load.
l
Afterburning (backfiring).
l
Black exhaust smoke or high fuel consumption.
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