Billy Shafer....

ray hofstetter · May 24, 2014

What sparkplugs do you recommend for the Onan B48M twin 18hp? I'm rebuilding the carb and might as well do it all....I've gotten different opinions but value yours.

Billy Shafer · May 25, 2014

I would stay away from Champion. I prefer NGK or Autolite. Champion has a high failure rate. From what I have seen

Billy Shafer · May 25, 2014

Had to grab my files.

NGK 3112
Bosch 7919
Autolite 4316. If I read my notes correctly.

I had four out of eight Champions fail in one week. Stopped using them.

ray hofstetter · May 25, 2014

Thank you sir, rebuilt the carb today and while the intake manifold is off, might as well adjust the valves. I got Autoliite plugs, they looked at me like i was nuts at the auto parts store when i told them no Champions. I've seen the video of how they're made - no thanks.

Billy Shafer....

ray hofstetter

Well-known Member

Billy Shafer

Well-known Member

Billy Shafer

Well-known Member

ray hofstetter

Well-known Member

Similar threads