tired of guessing, i want to know.... 1964 18hp

[montff77]

Hi all. What is the difference (what can I change) in the 64 18hp and the 1966 20hp? I checked part numbers and all looked the same besides the reed stops????? Confirm? Deny? Is like to make the conversing bc I don't like leaving ponies on the table that 2hp gains is 11%!!!!!! Who wouldn't want it!!!!! Also, should I mill the head .060 and run 89octane, square the intake ports, blend the transfer area to flow better? I don't want to do iffy stuff to it. Any and all info is Greatly appreciate. Thank you. Great site!!!!!

 

[Daviet]

Re: tired of guessing, i want to know.... 1964 18hp

If you are going to do all that work for a possiable 2hp gain, why dont you just get a 20hp engine and forget all the work? You are not going to be able to feel any difference between the two when they are on your boat.

 

[kfa4303]

Re: tired of guessing, i want to know.... 1964 18hp

I agree with Daviet. The 2 hp is negligible, especially for all of that work.

 

[boobie]

Re: tired of guessing, i want to know.... 1964 18hp

If it's running good leave it alone. Not worth the $$$$ to mess with it.

 

[motoman]

Re: tired of guessing, i want to know.... 1964 18hp

The 60's model 18's are some the best motors made . I would worry about the 2 hp . Sweet running engines.

 

[montff77]

Re: tired of guessing, i want to know.... 1964 18hp

Thanks for the replies guys. It would be piece of mind knowing that itd be original

 

[Chinewalker]

Re: tired of guessing, i want to know.... 1964 18hp

Unless you're running it on a small hydroplane where small changes can make a noticeable difference, you really won't notice any bump between the 18 and 20. As you noted, they're virtually the same motor with the exception of the reed stops, which are opened up a tad more on the Johnson 20.

 

[montff77]

Re: tired of guessing, i want to know.... 1964 18hp

Thanks. I guess partly I just wanted to know if my assumption was correct. It's nice having that confirmed. I still say that if I see the stops on eBay that I will throw them in and call it a 20.... Some may say why?, but I get stuck on why not????? Better to gain two than loose two even if you couldn't tell.... Wait that'd be four!!!! Lol thanks again.