Johnson 25hp Model Year ID Parts Compatability ?

[Demiandvm]

Well I think I found a lower unit for my 25hp. My present motor is Model # 25R74M (Ser # E4020482) and my donor motor is Model 25R73A (ser# E3885828). The donor appears to have few hours plus electric start. The owner said his son ran it without oil mixed fuel and ruined a cylinder. I'm tempted to check that out first. Anyway, can I swap the lower units on these motors? Thank You!<br /> Michael

 

[ezeke]

Re: Johnson 25hp Model Year ID Parts Compatability ?

You might want to look up the two models in the BRP Parts Catalogs and satisfy yourself on that:<br /><br /> BRP Parts Catalogs

 

[Chinewalker]

Re: Johnson 25hp Model Year ID Parts Compatability ?

The '73 should have a standard magneto ignition (coils under flywheel), while the '74 should have the low-tension magneto (coils on cylinder head). Outside of that, the motors are pretty close. Yes, the units will swap out.<br />- Scott

 

[perkdp]

Re: Johnson 25hp Model Year ID Parts Compatability ?

I recently restored a 73 model 18 hp .... and if I remember correctly, the bottom ends were the same on the 18 thru 28 hp E and J from 1968 thru 1975. <br /><br /> http://epc.brp.com/login.aspx?ReturnUrl=/default.aspx?brands=ej&lang=E&brands=ej&lang=E <br /><br />click parts catalog