1977 Powerhead fit 1983 25 hp?

[wbeaton]

I posted this before, but got no bites. I'll try it one more time.

I have a 1983 Johnson 25 hp with a bad powerhead. Anyone know if I can replace it with any 25 hp powerhead back to 1977?

 

[tashasdaddy]

Re: 1977 Powerhead fit 1983 25 hp?

Wayne, i did this the hard way, but looking just as the cylinder & crankcase numbers looks like 1981 to 1988 all the numbers supercede to 435942. i have no idea what other difference there are.

 

[wbeaton]

Re: 1977 Powerhead fit 1983 25 hp?

Thanks, TD. I did the same and found what you did. However, I know this series started in 1977 and I wondered if the differences were only minor before 1982. It sure would be more convenient to just drop on a complete running powerhead then to rebuild the motor. Price would be about the same, but much less time and hassel.

 

[tashasdaddy]

Re: 1977 Powerhead fit 1983 25 hp?

the case # before 81 would not crossreference to anything newer. came up NLA.

 

[wbeaton]

Re: 1977 Powerhead fit 1983 25 hp?

Looks like I found a good 1981 25 hp powerhead that will work. Thanks again.

 

[tashasdaddy]

Re: 1977 Powerhead fit 1983 25 hp?

super.