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Normal Life
A worn spark plug not only wastes fuel but also strains the whole ignition system because the expanded gap
(due to erosion) requires higher voltages. Normal rates of gap growth are as follows:
Four Stroke Engines: 0.01~0.02 mm/1,000 km (0.00063~0.000126 inches/1,000 miles)
Two Stroke Engines: 0.02~0.04 mm/1,000 km (0.000126~0.00252 inches/1,000 miles)
Abnormal Erosion
Abnormal electrode erosion is caused by the effects of corrosion, oxidation and reaction with lead - all
resulting in abnormal gap growth.
Melting
Melting is caused by overheating. Mostly, the electrode surface is rather lustrous and uneven. The melting
point of nickel alloy is 1,200~1,300°C (2,200~2,400°F).
Summary of Contents for GY6
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Page 19: ...19 Torque Settings 150cc Scooter ...
Page 20: ...20 TORQUE SETTINGS 150CC ...
