Auto Choke Unit Check - Yamaha CE50T Service Manual

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AUTO CHOKE UNIT CHECK
_"_*_ 1. Remove:
®Auto choke unit
2. Measure:
!_i • Starter plunger height (_)
Plunger height will not change with the
temperature change-_ Replace.
Plunger height measurement steps:
oFreeze auto choke unit to -5°C (23.5°F) in
freezer.
oMeasure plunger height at -5°C (23.5°F).
_Take auto choke unit out of freezer and after
about 30 minutes, again measure plunger
height at room temperature.
*If both measurements are the same, auto
choke unit is defective. Replace it. For
reference, below is a table of plunger heights
at respective temperature.
Temperature Plunger height
-5°C (23.5°F) 16.1+0.3 mm (0.63+0.01 in)
10°C (50.5°F) 17.8±0.3 mm (0.70+0.01 in)
20°C (68.5°F) 18.8+0.3 mm (0.74±0.01 in)
30°C (86.5°F) 19.7+0.3 mm (0.78±0,01 in)
40°C (104.5°F) 20.1±0.3 mm (0.79±0.01 in)
NOTE:
In the above table, auto choke was first freez-
ed to -5°C (23.5°F) and then the
measurements were made at while the
temperature was raised gradualy.
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