Spark plug gap

JGvtec

New Member
Im sure for a fact that they come pre gapped. Don't quote me on that though.

Quoted from NGK

Do I need to set the "gap" when installing a new set of plugs?

A: Maybe. A spark plug part number might fit hundreds of different engines from many different manufacturers. Although the NGK factory will set the gap to a pre-selected setting, this may not be the right gap for your particular engine. The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy, and accelerated plug wear. It is always best to check the gap against the manufacturer's specifications. If adjusting the gap on fine wire or precious metal plugs such as platinum or iridium be very careful not to apply any pressure or prying force to the fine wire center electrode or insulator as they can be damaged. The gap should be adjusted by only moving the ground electrode.
 
Last edited:

atomic_peach

New Member
According to Helm's manual:

NGK non platinum - 1.0-1.1 mm (0.039-0.043 in)
NGK platinum - 1.2-1.3 mm (0.047-0.051 in)
 


Top