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Chapter 2
Operating the Engine
2.1 General Guidelines
It is absolutely necessary to follow the instructions in this chapter in order to achieve long-
term, economical, and satisfactory service from the engine.
-
USE ONLY THE PRESCRIBED TYPE OF TWO STROKE OIL AND THE PROPER
GRADE OF GASOLINE.
-
INSURE THAT FUEL IS MIXED IN THE CORRECT GAS/OIL RATIO .
-
REMOVE THE FUEL FROM THE CARBURETOR BOWLS AND GAS TANK
WHENEVER THE ENGINE IS NOT GOING TO BE USED FOR AN EXTENDED
PERIOD. AFTER A LONG STANDDOWN, REMOVE ANY LEFTOVER FUEL IN
CARBURETOR BOWLS AND GAS 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.
-
BE SURE THAT HEATED AIR IS NOT SUCKED INTO THE CARBURETORS.
-
USE ONLY RESISTOR TYPE SPARK PLUGS AND RESISTOR PLUG CAPS.
-
EVERY TIME A WARM UP PHASE BEFORE RUNNING THE ENGINE UNDER
LOAD
2.2 Break In Procedures
Hirth engines have no explicit break in procedures, since the Nikasil coating of the cylinders
and the Aluminium pistons do not have to adjust to each other. The engines are sealed from
the time of their assembly in accordance with the maximum temperatures prescribed in
Chapter 1 for cylinder heads and exhaust gas.
After the first 10 – 15 hours in service or after a major inspection, the following tasks should
be accomplished for safety reasons:
-
tighten engine mount bolts
-
tighten cylinder head bolts
-
tighten spark plugs
-
check for leaks, loose nuts and bolts
15
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