Fuel Recommendations - Honda GX620 Owner's Manual

FUEL RECOMMENDATIONS

LPG: Propane content of 95% or higher.
NATURAL GAS: Methane content of 90% or equivalent.
This engine is certified to operate on LPG or NATURAL GAS only.
Occasionally you may hear a light ''spark knock'' or ''pinging''
(metallic rapping noise) while operating under heavy loads. This is no
cause for concern.
If spark knock or pinging occurs at a steady engine speed, under
normal load, see an authorized Honda servicing dealer.
Running the engine with persistent spark knock or pinging can cause
engine damage.
Running the engine with persistent spark knock or pinging is
considered misuse, and the Distributor's Limited Warranty does not
cover parts damaged by misuse.
SERVICING YOUR ENGINE
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