Spark Plugs

Hello,

I'm a new M38A1 owner. I need to get new spark plugs, and there seems to be two kinds available: Autolite 2243 and 2245. Which one should I get, and what's the difference?

Thanks!

IIRC 2245 is a hotter plug than the 2243, if you don't have any oil fouling I'd go with the colder plug.

Actually 2243 is the correct specified standard plug for the M38 which has a L134 engine. The 2245 would be an option for a hotter plug if fouling is an issue.

2245 is the specified standard plug for the M38A1 which has the F134 engine. The 2247 would be an option if fouling was an issue.