DeWalt GX390 Owner's Manual download pdf (Page 25)

SERVICING YOUR ENGINE

FUEL RECOMMENDATIONS

Use LPG with a propane content of 95% or higher.

This engine is certified to operate on LPG 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, change brands of LPG. If spark knock or pinging persists,

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 misuse,

and the

Distributor’s Limited Warranty

does not cover parts damaged

by misuse.

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DeWalt GX390 Owner's Manual Page 25