Re: jw 3hp powerhead swaps
The 4hp is quite a lot different motor. 1967 was the last year of the integrated tank model. 1968 was the last year of the 3hp, but they also made it an entirely different design too. The same with the 4hp. They changed the shrouding and beefed up the midsection. The integrated tank was discontinued after 1967. The 1967 model was pretty much unchanged from 1952. As a matter of fact, the basic desin in the ojder JW's was derived from the earlier HD model. There's a lot of similarities with the appearance of the HD and JW, eventhough everything under the shroud is completely different. So, your 1967 JW is a design that's pretty much the same appearance that has been in production since 1941. LOL 1968 and newer, was a different animal.
