Pipe Plugs????? are you trying to make a flame thrower?
Stock Harley plugs works as good as any.
There are two spark plugs on a harley motor. Typically on the left hand side, 1 per cylinder.
All 2002 Harley Big Twins left the factory with H-D brand 6R12 spark plugs. These can be replaced with Accel Y2418P, Autolite 4164, Bosch YR6LDE, Champion RA8HC or NGK DCPR7E.
I prefer Autolite plugs. Dyno shows them to add about 2 HP.
go to the back of the truck and find the exhaust pipe, point a flash light into the pipe. they are at the end of the pipe
Gap the plugs .038" to .043" and torque the plugs to 22 ft/lbs.
It is illegal to remove the converter.
The suggested spark plug gap for a 1973 Harley Davidson is 0.040. It is the suggested gap for most of the spark plugs of that era.
5/16ths fine thread
harley 883 fuel tanl vent pipe
Depends on what size ci. Originally they took a Champion #3 or #4, from Harley, and sometimes they used a #5, which is a "cooler" plug.
ALL Twin Cam engine plugs are a .040 gap