Linhai HY740STL 2018 Service Manual page 122

CHAPTER 3 ENGINE
3.18.6.3 Technical Parameters
A/F ratio rich threshold: ＞750 mVDC
A/F ratio lean threshold:＜120 mVDC
Heater power: 7.0W
(These parameters as above are measured basing on 450°C (engine dyno),
typically on 70% duty at 10Hz and under 13.5V)
Heater part resistance: 9.6±1.5Ω
(This parameter is measured basing on 21°C)
Operating temperature range: 260-850 °C
3.18.6.4 Fuel Quality Requirements
Pb≤0.005g/L
P≤0.0002g/L
S≤0.04% (weight proportion)x
MMT≤0.0085g/L
Si≤4ppm
Ignition Coil
3.18.7
3.18.7.1Description and Working Principle
This coil provides energy to the spark plug in the combustion chamber. The coil
itself doesn't have a driver. The high voltage tower of the coil is connected to the
spark plug using a high voltage cable assembly. This is a non-serviceable
component.
3.18.7.2 Appearance
The appearance of the Ignition coil is shown as below.
M750L SERVICE MANUAL 18.0
CHAPTER 3 ENGINE PAGE 3- 91