Mac Afric MGENER-220 Operator's Manual page 21

Occasionally you may hear lighi "spark knock" or "pinging", (metallic rapping noise) while operating under heavy loads. This is no cause !or
concern.
If spark knock or pinging occurs at a steady engine speed, under normal load, change brands of gasoline. If spark knock or pinging persists, see
an authorized MP generator dealer.
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NOTICE
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Running the engine with persisient spark knocl< or pinging can cause engine damage.
Runing the engine with persisient spark lmock or pinging is misuse, and the Disiributor's Limited Warranty does not cover parts damaged by
misuse.
Oxygenated Fuels
Some gasolines are being blended with alcohol or an ether compound to increase the octane. These gasolines are collectively referred to as
oxygenated fuels. Some areas of the United States use oxygenated fuels to help meet clean air standards.
If you use an oxygenated fuel, be sure its pump octane rating is 86 or higher.
Ethanol (ethyl or grain alcohol)
Gasoline containing more than 10% ethanol by volume may cause siarting and/or performance problems. Gasoline containing ethanol may be
marketed under the name "Gasohol".
Methanol (meUiyi or wood alcohol)
Gasoline containing methanol must contain cosolvents and corrosion inhibitors to protect the fuel system. Gasoline containing more than 5%
methanol by volume may cause starting and/or performance problems and may damage metal, rubber and plastic parts of your fuel system.
MTBE (methyl tertiary butyl ether)
Your may use gasoline contining up to 15% MTBE by volume.
Before using an oxygenated fuel, try to confirm the fuel's contents. Some states require this information to be posted on the pump. If you notice
any undesirable operating symptoms, switch to a conventional unleaded gaso-line. Fuel system damage or performance problems resulting
from the use of an oxygenated fuel are not the responsibility of factory and are not covered under warranty.
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NOTICE
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Oxygenated fuels can deimage paint mul plasiic. Se carelul not to spill fuel when filling your fuel lank. Damage caused
by spilled fuel is not covered under warranty.
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