Internal view of the Bass/Tohatsu M50D2 engine.

Jeffs' shout!

Internal view of the Bass/Tohatsu M50D2 engine.

The information contained here is for informational purposes only and is not necessarily endorsed by Bass Machines or Tohatsu America.

It is recommended to always follow manufacturer's instructions

when servicing or operating this equipment.

Back in '05, I disassembled and then re-assembled my Bass/Tohatsu M50D2 engine.

This is a partial photo journal of that procedure.

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I disassembled my engine to have the

crankshaft pins welded in place.

This procedure, although not required,

is recommended by Bass Machines

to increase the engine's durability

under race conditions.

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Below you can see the engine block.

First, the complete block.

Then, with the reed blocks removed.

Last, with the crankcase cover removed.

The crankshaft assembly had already been sent away for welding prior to these photos.

Above, you can see the Bass Machines

built throttle assembly in place.

Note: This engine had been broke in and dyno tested prior to this teardown.

Here is the backside of the crankcase cover with the reedblocks in place.

You'll notice one carburator butterfly has been removed. That item had been sent to Alan Brown of Brown Tool and Machine. Alan used the part I sent him as a template to make full butterflies for the Tohatsu engine. Brown Tool and Machine should now have new full carburator butterflies on the shelf ready for purchase.

Bass towerhousing and swivel pin

Bottom view to show water pump cavity, etc.

Bass Machines micro-adjustable mounting system.

A nice built-in kick out adjuster is out of view.

Notice the nice water intake hole.

Driveshaft, coupler and water pump impeller. Yes, it's a standard Sierra impeller, readily available

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Tohatsu for Competition

by

Bass Machines

(360) 373-3839

Click here to download Bass/Tohatsu information file.