johnson v4?

[vic]

I have a johnso v4 85 hp and while it runs great, it isn't near enough motor of my 21' sunbird oddessy. The boat is 2400 lb dry. I was checking for some hop up parts since I can't afford a larger motor but I have had to boat mechanics tell me the block pistons and heads are the same from the 85-140 hp all that is different is jets and lower end gearing. How can this be and am I still better looking for a trade then re-jetting? I'm confused! <br />

 

[DJ]

Re: johnson v4?

The 90-115 had the same bore and stroke, plus alot of other things.<br /><br />The 85 was a slightly smaller bore. <br /><br />You'll be better off looking for something else.

 

[jwhite]

Re: johnson v4?

You'd be better off just finding a bigger motor. It costs a lot more to up the horsepower on a motor then to just find one already at the horsepower you want. I always tell my customers that want to go faster that it's about a thousand dollars per mile an hour.

 

[vic]

Re: johnson v4?

Guess that only makes sense, I would like to get it too about 38-40 mph and it does about 31 now. Guess I need to sell my little 85 and find something bigger. Thanks guys for the help.

 

[DJ]

Re: johnson v4?

Vic,<br /><br />I think something of newer vintage in the 115 to 140 range would get you there. Your 85 was rated at the crankshaft, newer engines are rated at the prop.<br /><br />There are some interesting deals on this web page.