The best spark plug for the IH engine (304 345 392)

[Daniel Back]

champions are useless.....long story..........ac r45's "ARE THE BEST" i run ac's in EVERY thing............its amaving how a plug can make a world of difference isnt it..............auto lites are good to..

[JWaters]

I think it would be really interesting to start another poll indicating your SECOND choice of spark plug if the 1st choice could not be located.

[rebelscout]

Originally Posted by JWaters

I think it would be really interesting to start another poll indicating your SECOND choice of spark plug if the 1st choice could not be located.

Whats your first choice, and why cant they be located If you have a NAPA near by you can pretty much find any plug you need..

[70binderPA]

i like to run NGK in carbureted.. they don't seem to carbon as fast as others, i have autolites in my IH with about 15 gallons worth of gas on them, and they already feel weaker than new

[canaminal]

I need to run the coldest plug avail. Used to use a bosch platinum but the pts dealer I have acount with dropped them. Ive got 11 months and 38000 on champ J4C's -industial app. cold heat range for long hard runs. Virtually nobody out torques me on hills+ no detonation at 10 btdc 18mech adv 10.5-1 comp. ratio on propane. 303's were terible for detonation as they are "HOT" plugs."85"s were a little better. I have platinum "cold" NGK's coming can't remember the new pt # but they are the same heat range as the KTM 2 stroke I race. If you baby it you want HOT plugs(gas mileage little better) if you DRIVE it you want cold!!!

If you ping just a little bit but like the responce try 1-2 heat ranges colder and leave the timing alone.