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http://www.ultralightnews.ca/hirth-engines.htm Page 17 of 31
The Ultralight News
5Operation of the Engine
5.1General
It is important to observe the instructions provided in this chapter in order to maintain a safe and economical
operation of the engine.
USE ONLY THE PRESCRIBED TYPE OF TWO STROKE OIL AND THE PROPER GRADE
OF FUEL.
INSURE THAT FUEL IS MIXED IN THE CORRECT GAS/OIL RATIO. REMOVE THE FUEL
FROM THE CARBURETOR BOWLS AND FUEL TANK WHENEVER THE ENGINE IS NOT
GOING TO BE USED FOR AN EXTENDED PERIOD. AFTER A LENGTHY STANDDOWN,
REMOVE ANY LEFTOVER FUEL IN CARBURETOR BOWLS AND FUEL TANK BEFORE
OPERATING THE ENGINE.
TAKE CARE THAT THE AIR CIRCULATION IS SUFFICIENT TO COOL THE ENGINE AND
SUPPLY THE CARBURETORS.
INSURE THAT THERE IS NO OBSTRUCTION THAT CAN IMPEDE THE EXIT OF HOT
AIR.
ENSURE THAT HEATED EXHAUST AIR FROM THE COOLING SYSTEM IS NOT SUCKED
INTO THE CARBURETORS.
USE ONLY RESISTOR TYPE SPARK PLUGS AND RESISTOR PLUG CAPS.
ALWAYS ALLOW THE ENGINE A WARMUP AND COOL DOWN PHASE:
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