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http://www.ultralightnews.ca/ Page 22 of 31
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6.3Replacement of Parts
The parts listed in Table 3.3-1 should be replaced after the specified number of operating hours.
Consideration should be given to componets which may show signs of premature failure and replaced
accordingly.
Table 7-3-1
The abbreviation ?Single? means single ignition and ?Dual? represents dual ignition.
Number Designation Order number Operating Hours
2
Sparkplug Single 023.29 50
4
Sparkplug Dual 023.28 50
2
Sparkplug cap 024.22 100
4
Sparkplug cap 024.22 100
2
Piston set 014.72 1000
1
Crankshaft 271 AA1U 1000
2
Cylinder Head Single F302 A1 1000
2
Cylinder head Dual 272 X1 1000
2
Cylinder 272 K1 1000
2
Carburettor VM 34-389-1 1000
2
Air filter 066.16 100
7Maintenance instructions
7.1Carburettor
The Mikuni carburettor jets are designed to guarantee thermally safe engine running. Adjustment to the jet
systems of the carburettors should be avoided as this can lead to overheating and damage to the motor. Only
original replacement parts should be used. Data concerning the carburettor assembly may be obtained you?re
your Hirth distributor and the carburettor identification number should be quoted.
7.2Inspecting the air filters
To remove the air filters, loosen the clamp on the air filter with a screwdriver, and slide the air filter off from
the carburettor flange.
Wash out the air filter with fuel and then dry. To do this, blow out the filter with compressed air from inside
to out. Check the filter for damage and replace any defective filters and clamps.
To install the air filter, insert over the carburettor flange and fasten the clamp with a screwdriver again.
7.3Inspecting the fuel lines
Check the fuel lines between fuel ? diaphragm pump, carburettors and fuel tank for leakages and/or other
damage. Replace leaking and/or damaged fuel lines.
7.4Inspecting pulsation lines
Check the pulsation line between the vacuum nipple on the crankcase and the pulse connection of the fuel ?
diaphragm pump for leakage and/or other damage. Replace the leaking and/or damaged pulsation line.
7.5Spark plugs and sparkplug leads
It is recommended that the spark plugs be checked one after the other to avoid mixing up the sparkplug leads
and their connecting positions.
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