Re: 9.9 Johnson Carb Question

[PugetSoundBoater]

quote rudderless:

The 74-75-76 head have issues if low speed is desirable. The later heads are lower compression, have a charge deflector to protect the plug from fuel spray. I just bought a 89 head for my 76 to improve low speed. Those heads do not have that cooling jacket around the plug like past years. I will have to mod the cowl to clear the thermostat though..

I just looked at a 1975 15 hp head i recently acquired . It doesn’t have the raised ridges(charge deflector) on the inside of the head dome,like my ’76 later upgraded head. It also has the early water cover with the straight center divider in the water passage/T stat cover . You say it is a higher compression head?
Have you thought about milling the later head to raise the compression to the level the early head had ? Would there be a benefit to that?
Thanks,Jim PSB

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