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Any updates?

Did you ever get the motor complete and running?

How have you made out with the rebuild? Were you able to find new parts and gaskets for the motor? Were you able to confirm that the motor is 750 cc?

Here's is what WE know about the twin Yamahas.
- in the late 1970's to early 1980's Yamaha made the displacement larger
- the block was the 6F0 ....60C Yamaha....60E Mariner
- it was still 60 hp...

IF? Yours is an original 60de you already have the best model. Your motor has all the good parts. Please post pictures and port measurements. We have never seen the inside of an 6f1 powerhead. Thanks...

I did reply to your private messages. The two motors you have are different and I am surprised you got 6F0 parts and gaskets easily. Good for you. The exhausts are different. One is the single piece...

You replace the complete clamp bracket assembly. The 55 hp mid is almost exactly the same as the 90 Yamaha. So you can use 70, 90 or late model 55 Yamaha. The problem is taking the old parts off your...

You have some options:
- the old style twin ram Mercury fits
- as Fred mention.. the Pro 50 can be modified to fit You switch the lower yoke on the steering arm and make the two top bolt hole a...

Just to go off topic for a post. T750 class here is more of a drivers class and a weight class than it is a horsepower class. Racers can buy a used 750 motor here for under $1000. They can get a...

Based on Thundercat and APBA Formula 50 racing the Tohatsu 50D is superior to the 50 hp Yamaha. We have not had a 50 Yamaha race in T750 here. The Tohatsu has the speed record in T750 at near 66 mph...

I can answer that question. Based on our race experience here in T750. The 2 cylinder OMC motors outperform the 3 cylinder Tohatsu. APBA does not allow the 2 cylinder OMC to race in D class against...

I was not trying to get the 2 cylinder to outperform the 70CES. Initially I was looking for information on the mod 2 cylinder motors they raced in Japan. I could not find any. During the search I...

This project is an on going challenge and I still are NOT where I would like to be.
In brief here is an up-date.
- the motor I wanted to end up with is the original race version..model 6F1..it was...

Mark YES that is part of it for sure. But, props are much better now than they were back then so the advantage has to be with us prop wise. Second in the case of the Japan tunnels. Those tunnels were...

Time to refresh this old thread. We should be able to get more first hand information with the resent replies on the T850 thread. Since 2012 this is what we have found out. Again this thread is all...

Is anyone got on to building one?
Here is a very nice stock one. Great platform for the mod!
...

That did not last long!

http://www.ebay.co.uk/itm/YAMAHA-MARINER-OUTBOARD-DRIVE-SHAFT-HOUSING-55-60H-P-2-STROKE-STD-SHAFT-/380394636025?pt=UK_CarsParts_Vehicles_BoatEquipment_Accessories_SM&hash=item58914982f9

DRIVE...

WOW!! 88 workcar....Take him up on that offer if you have 2 blocks. I would if I had two blocks!

I have a powerhead, it is up north in snow country, I can't get to it to take pictures to show.
I suggest you post the pictures of your motor and see what suggestions are made. I think the key is...

I can help you out a bit
2 cylinders. 46.4 displacement. The bore width is 3.23" and the stroke length is 2.83".
They will turn 8000
Solid steel crank
used complete motor $500.00
You can...

The 2 cylinder motor is the same bore and stroke as the 90 Yamaha. We know that with a little porting, reeds and head mods to get in the 170 psi range. That motor is getting 20 to 25% more power...

http://www.boats.net/parts/search/Yamaha/Outboard/1994/C55ELRS/UPPER%20CASING/parts.html

NOTE: YAMAHA DID NOT MAKE THE 15 inch model to my knowledge.

It's a big chamber not a pipe

http://www.boats.net/parts/search/Merc2/Mariner/60%20%282%20CYL.%29/675-001171%20AND%20UP/DRIVESHAFT%20HOUSING/parts.html

Because of the 70 CES Yamaha Thread several people are interested in building one of this power heads.

The Motor

In the states it was the Mariner 48, 55 and 60 hp, 2 cylinder, 15 inch, 1.84 or...