tohatsu 50 - yamaha 70 carbs?

**sabine river killer** · 03-17-2014

Originally Posted by Fastjeff57

You're saying that these built up cranks need to be tack welded so they don't shift?

Jeff

yes the yamaha cranks as well any multi piece crank done in many engines not just outboards

**proprider01us** · 03-17-2014

That is correct. Had mine done like this.

Originally Posted by Fastjeff57

You're saying that these built up cranks need to be tack welded so they don't shift?

Jeff

**nhpoplin** · 03-19-2014

Originally Posted by sabine river killer

yes the yamaha cranks as well any multi piece crank done in many engines not just outboards

Yea they definitely need to be welded. Twisted my crank in my yamaha 50 over this past weekend.

**Roflhat** · 03-20-2014

Originally Posted by nhpoplin

Yea they definitely need to be welded. Twisted my crank in my yamaha 50 over this past weekend.

Wow, i was under the impression the yamaha ones were much stronger

**Rabbitdundied** · 03-21-2014

Educate me on this. When you say weld a crank are we talking spot weld or running a substantial bead? Also does anyone actually lighten their cranks to get more performance?

Sent from my iPhone using Tapatalk

**proprider01us** · 03-22-2014

Look at post #22, it shows where Tim Kurtz did the spot welds on my Yamaha crank. The cranks are a press fit and could reposition under extreme loads. Spot weld makes sure that does not happen. Don't know anything about lightening cranks, but you certainly can lighten the flywheel to help the crank loads and offer a bit more acceleration. Post #22 is the only picture I took of the crank welding. Hope that helps.

Originally Posted by Rabbitdundied

Educate me on this. When you say weld a crank are we talking spot weld or running a substantial bead? Also does anyone actually lighten their cranks to get more performance?

Sent from my iPhone using Tapatalk

**sabine river killer** · 03-24-2014

4 wheelers too Name: IMG_8155.PNG
Views: 1347
Size: 416.1 KB

**Roflhat** · 06-14-2014

Having problems with the carbs and the throttle setup from the tohatsu not wanting to work together. The way the linkage on the yam carbs is means they're at almost wide open throttle when the tohatsu tiller is at idle.
Took off the carbs to compare, not quite sure how to sort this?

The roller on the top LHS of the carb is the problem.
I've tried taking the assembly from the 50 carb over to the 70 but it's much shorter and won't work. Can't see an obvious solution other than welding the 50 setup onto the 70 one?