Re: 1969 Johnson 4hp and 1973 Johnson 25 hp
If it were my 4hp, I'd run it a tad richer, perhaps at 40:1, as it has bronze/aluminum connecting rods and I've seen a lot of them let go at 50:1 mixes, usually taking the block and crankshaft with it.<br /><br />The J4J plug is no longer available, so use the J4C for both motors...<br />- Scott
