![]() Of course, you should only remove and install spark plugs in a cool engine, because metal expands when hot and thread damage can happen. The spark plug holes must always be clean prior to installation otherwise, you may be twisting against dirt or debris and the spark plug will be under-torqued, even though your torque wrench indicates the proper torque. In short, over torquing can cause severe engine damage. The most dangerous result is pre-ignition when the heat dissipation is reduced due to metal shell stretching by over torquing. Stretching of the spark plug metal shell can break the inner gas seals or cause a fracture in the spark plug insulator. Over torque can cause the metal shell of the plug to stretch. Proper torque specs for both aluminum and cast-iron cylinder heads are listed below. As a result, the firing end of the spark plug can overheat and pre-ignition can occur. A spark plug that is under-torqued will not be fully seated in the cylinder head and heat dissipation will be slowed. Excessive changing of the spark plug gap. The spark plug gap adjustment should not be changed more than 3 times and should not exceed. For example, the NGK spark plug BKR6E-11 will have a gap of 1.1mm (.044). Torque directly affects the ability of the spark plug firing end to dissipate heat to the cylinder head. Spark Plug Gap Chart - Brisk USA > sparkpluggapsparkplug. This specifies the size of the gap that the plug requires. Torque is one of the most critical aspects of spark plug installation. Intro Table of Contents Yamaha Spark Plug Fitment Chart Manufacturer Model Standard Plug Iridium Plug Electrode Gap YAMAHA AEROX 100 (YQ100) NGK BR8HS NGK BR8HIX 0.6 MM YAMAHA AEROX R NGK BR8HS NGK BR8HIX 0.6 MM YAMAHA AEROX R NGK BR8HS NGK BR8HIX 0.6 MM YAMAHA AEROX R POWER NGK BR8HS NGK BR8HIX 0.6 MM YAMAHA AEROX R / NAKED (4-Stroke) YAMAHA AEROX R / NAKED 2-T NGK BR8HS NGK BR8HIX 0.6 MM.
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