MTFCA Forum

I’m currently using Autolite 65 spark plugs in my Rajo head. I’m not that satisfied with my performance and plug life. They seem to foul easily, and wondered if someone had a plug that they liked? If anyone else used the Autolite 65 plug and liked their performance? Thanks Pat

I rather expected on of the folks running RAJO heads would have replied but . . .

I had issues with my Fronty finding a good spark plug. Eventually settled on using a spark plug adapter for a Model A (18 mm) that lets me run modern 14 mm plugs. I've tried various plugs but am happiest with NGK BKR5EGP. Naturally carburetion and ignition changes make a lot of difference.

If your Rajo has the pipe thread spark plug holes like a Model T, you can get the T-5201-ADP adapters from Snyder's. If the head has the straight thread 18 mm like a Model A, get the A-12405-ADP adapters, likewise from Snyder's.

Good Luck, at least the 14 mm plugs are relatively cheap and come in various heat ranges.

Walt

Pat - I run Champion A25 plugs in my Rajo Model 30 head. Gapped at 0.035" I've had good success.