Chainsaw Repair

In the model airplane world we change over the BPMR7A gasketed spark plugs for the tapered seat version BPMR7F because the tapered seat spark plug is much smaller on the outside. It makes for a more compact engine. There are no modifications required except to just change the spark plug.

I bought a new '87 Cavalier and a couple years later, AC no longer made the gasketed spark plugs and I was forced to use '88 Cavalier tapered seat spark plugs for the rest of the life of the automobile. This never caused any problem in the aluminum head.