1956 30 hp

[R. Bushie]

I am starting to rebuld a newly obtained 1956 30 hp Johnson model RD-18. This motor is a manual start and I want to turn it into electric start. In doing so I will have to change the flywheel etc, will a 1955 25 (RDE-17) hp fly wheel with ring gear fit the 1956 model? I guess while I'm at it what other parts will interchange properly? I am aware that the power heads are different in respect to compression, pistons etc.Also will a 20 hp lower unit fit this 30 hp properly? Any help in this matter would be appreciated.

 

[Chinewalker]

Re: 1956 30 hp

Hi R.Bushie,<br /> Okay, yes the flywheel will interchange. The starter will also interchange IF you swap out the bracket with it. The '55 25hp used a 6V system and the starter bracket was different to accomodate the larger starter motor. Personally, I would find a 12V starter and the proper bracket to mount it. You can only use brackets from '56, '57, and '58 (base model only) as they incorporate the cowling bushing, too.<br /> The lower unit from a 20hp will NOT fit the 30hp. The unit from a '55 25hp will. Many other parts from the '55 will interchange, too.<br />- Scott