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
It is illegal to remove the converter.
Gap the plugs .038" to .043" and torque the plugs to 22 ft/lbs.
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