95 Force 70hp Rebuild

[Prophammer]

I find it all very interesting , let me say , my first thought was Post #3, there's a nice looking Yamaha 70 on eBay right now

 

[jerryjerry05]

Old post.

 

[racerone]

Why would " premium " fuel cause broken pistons / rings ?

 

[atengnr]

Well, as an update, I found a used powerhead for sale on ebay in December. I rolled the dice and purchased for $450. I inspected cylinders, and pistons by way of exhaust cover and head removal and it looked great! I have since replaced gaskets,and just recently got it all back together. Waiting for better weather to roll the boat out see how (if) it runs. I will be running only full synthetic oil in this thing, and am curious to see if I can get some trouble free use out of it. If not, its been fun messing with force outboard for one year. I will let you know how it goes on start up.

Russ

 

[atengnr]

By the way, do you all just strip the foam out of the engine hood, given that they start to crumble at this age to prevent carburetor ingestion??

 

[Nordin]

Atengnr I love your intention to go on with this Force OB.
Force/Chrysler OB are no bad engines, just old school design and easy to work on.
I think you have learned a lot with this.
About the foam inside the cowl, just take it away and then you can glue foam for car noice reduction if you want.

 

[The Force power]

Totally agree :tea:

 

[jerryjerry05]

I took the foam out and never replaced.
Just way too many things to do.
Actually never noticed the difference.

 

[atengnr]

Thanks all. Does anyone know where Ican get a decent engine hood base rubber seal? Mine is functional but cracked.

Thanks

 

[atengnr]

Hello all. Closing update here....Finally got the motor out on the water with the swapped powerhead. It runs spectacularly, with great starting and idling. I thought you all might find this interesting though - The old powerhead, with cracked piston rings, and one cracked piston actually did not run appreciably differently. Perhaps this motor is 1 mph faster, but that is about it!!! How the heck is that possible? As for the original reason that I tore into the motor - poor fuel economy - that is also about the same.

Anyways, I am running full synthetic evinrude injection oil at 50:1 (plus an extra ounce or two/ 6 gallons mix), and I want to see if I can get some trouble-free running time out of this motor.