Johnson to Yamaha

[crw1957]

Thinking about re-powering my 23 foot cuddy fro 225 Johnson to 225 Yamaha. Any thoughts.

 

[chris.olson]

Re: Johnson to Yamaha

Thinking about re-powering my 23 foot cuddy fro 225 Johnson to 225 Yamaha. Any thoughts.

I'd bolt on a Merc 225 OptiMax. The OptiMax is almost 100 lbs lighter than a F225 (or 50 lbs lighter than a Vmax), has a 60 amp alternator, and the simplicity of the two-stroke is hard to beat. And the direct-injected OptiMax don't give up anything in fuel economy to the four-strokes either.​

It's a personal preference, but I also believe in the idea that when I buy something my money goes to support an American company instead of the profits from my purchase ultimately ending up overseas.
--
Chris​

 

[tashasdaddy]

Re: Johnson to Yamaha

you did not tell us much. 2 or 4 cycle.

 

[crw1957]

Re: Johnson to Yamaha

I currently have a two stroke. Trying to digest all of the pros and cons of the four stroke.

 

[56 rude]

Re: Johnson to Yamaha

I'd bolt on a Merc 225 OptiMax. The OptiMax is almost 100 lbs lighter than a F225 (or 50 lbs lighter than a Vmax), has a 60 amp alternator, and the simplicity of the two-stroke is hard to beat. And the direct-injected OptiMax don't give up anything in fuel economy to the four-strokes either.​

It's a personal preference, but I also believe in the idea that when I buy something my money goes to support an American company instead of the profits from my purchase ultimately ending up overseas.
--
Chris​

before you open up that can of worms you,d better check where they manufacture mercs, example of some of the places ,mexico,japan,china,belgium,usa,britan.ultimately some of the money may come back to the usa but merc is a global company just like the rest.though i suspect brp is only canada and usa with maybe austria thrown in for good measure.

 

[idrownworms]

Re: Johnson to Yamaha

What is wrong with the Johnson?

 

[chris.olson]

Re: Johnson to Yamaha

before you open up that can of worms you,d better check where they manufacture mercs, quote]

The OptiMax is built in Fon Du Lac, WI. The non-Verado four-strokes are built by Mercury Marine's joint venture with Tohatsu in Japan. The OptiMax uses some imported components, however, it's still an Amercan-based corporation (Brunswick) as opposed to foreign, aka YamaHondaZuki. The taxes and profits stay in the USA to insure the future of our economy for my kids instead of ultimately going to Japan.

Like I said, it's a personal preference and is the same reason I drive a Dodge instead of a Toyota.

 

[chris.olson]

Re: Johnson to Yamaha

I currently have a two stroke. Trying to digest all of the pros and cons of the four stroke.

The two-stroke, as a general rule of thumb, is simpler with fewer moving parts (no valve train), has higher power density and experiences less stress on internal components because it operates at a lower mean pressure (you have double the number of power strokes per crankshaft revolution in a two-stroke that you have in a four-stroke). The two-stroke has the advantage of less maintenance due to no oil changes required.

The cons of the two-stroke used to be that they were less fuel efficient due to part of the air/fuel charge being used for cylinder scavenging. That changed with the advent of direct fuel injection. Modern direct-injected two-strokes are just as fuel efficient as four-strokes. However, HC emissions are higher on a two-stroke because it ultimate burns its lubricating oil. Two strokes used to idle rougher than a four-stroke due to incomplete cylinder scavenging and low air/fuel charge density at idle. This is no longer the case with modern direct-injected two-strokes.

The four-stroke, as a general rule of thumb, has higher volumetric efficiency since part of the power stroke is not used for cylinder scavenging. This is a tradeoff for higher pumping losses, as opposed to a two-stroke, due to four piston cycles required per power stroke instead of two. The four-stroke (used) to idle smoother, however, see above.

The cons of the four-stroke are complexity and the higher associated weight that goes with adding things like camshaft(s) and cam drives, valves and consirably more complex cylinder heads. The four-stroke also requires periodic oil changes.

That's "in a nutshell". There's many other aspects but it all boils down to performance - a two stroke of the same piston displacement as a comparable four-stroke will outperform the four-stroke hands down, providing the four-stroke doesn't use supercharging or other performance enhancements that further increase its compexity.
--
Chris​

 

[kenmyfam]

Re: Johnson to Yamaha

Keep the Johnson !!!!

 

[swordfish25]

Re: Johnson to Yamaha

I would check out the evenrude 2 stroke E tec Lighter and better on fuel