Search:

Thanks

I did change the tuner to the M50D tuner. This was originally a 2004 M40D2 motor. There are 3 tuners for this motor. M40D is the smallest, (M40D2 & M50D2 are the same), and M50D has the...

I found out later that the 60 carbs have about the same bore as the stock Tohatsu 50 carbs. The 70 Yamaha carbs have a good bit larger bore.

71214

Update: My motor runs really good. It’s the best idling motor I’ve ever owned. I’m seeing speeds close to 50mph on my Edge 553 duck boat.

68163

68161

6812368124

Finally got the powerhead on!!

Getting the Yamaha carbs to work right is yet to be accomplished

Yes.

I'm porting the reed block cages. I'm not sure this will prove to be a good idea. What do you think?

63232

Got my reeds in today. Boyesen Power Reeds. They don’t look like what I expected. They were my second choice after Chris Carson reeds. Chris would never return my call or text after the first time...

This was done with a rotary file and a die grinder. I sanded and polished the surfaces after these were taken.

63087

63088

I did not do the port work. Pete Nydahl in Wisconsin did most of the work on the block. I highly recommend his work. The ports were widened a good bit.

I think you are right. From my research I found that the Yamaha 60 and 70 intake manifold and gasket is the same part number. That would seem to indicate that the carburetor throats are the same...

6197861980

Here's one of my yamaha 60 carbs with the chokes removed. They are a good bit larger in diameter than the stock 40 intake. I wanted to use 70 yamaha round bowls, but couldn't find any...

61975

Installed some socket caps on the exhaust cover

61970

Painted last night

61726

I finally got back on this project. I dropped in the crankshaft and bolted it up last night. Afterwards, I realized I had not checked the Wiesco piston rings to see if they were of different types...

Thanks Jerry that's some good info. I see u are in WI. Pete Nydahl, from WI, rebuilt the crank on this motor and did the block work.

My first rebuild a M40d2. Already done the following:

-Bored .30 over
-wiescos in hand
-Ported and polished
-crank rebuilt and welded
-flywheel lightened
-head cut

I think I'm ready to...