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Racer x · June 3rd, 2011, 07:10 AM

The pit in the piston causing a hot spot is slightly inacurate. The hot spot is the ground side of the plug. It heats up because it is sticking out .The glowing hot ground electrode will set off the fireing cycle before the spark plug sparks. This is called pre ignition.There will be more than a "PIT"in the piston.
The cure is serface gap plugs they are 48 dollars each .That is 480 dollars a case.

June 3rd, 2011, 07:10 AM	#140
Racer x ninjette.org certified postwhore Name: Eric Location: Iowa City Join Date: May 2009 Motorcycle(s): 2008 Kawmeracchi 350 2010 Project X Posts: A lot. Blog Entries: 54 MOTM - Sep '18, Feb '16	The pit in the piston causing a hot spot is slightly inacurate. The hot spot is the ground side of the plug. It heats up because it is sticking out .The glowing hot ground electrode will set off the fireing cycle before the spark plug sparks. This is called pre ignition.There will be more than a "PIT"in the piston. The cure is serface gap plugs they are 48 dollars each .That is 480 dollars a case.