Vibration Affecting Prop Slip

[JohnsonM50]

The automotive driveshaft is likely hollow & has a significant DIA compared to the solid outboard d-shaft & would be more sensitive to balance. The outboard shaft needs to be straight & spin true. The motor, mid & gearcase mount surfaces have to be parallel & aligned as well, there's little tolerance for error there since of course if you weren't looking to run faster you wouldn't do it.

[Fastjeff57]

Too true! And that wasn't the case with the adapter I used. The next one will be far more conventional and should work fine.

Thanks!

Jeff

[pdt]

I do like to read about these types of things, it shows great ingenuity and good old fashioned determination.
plus the end results are nearly always pretty good and turn normal old stock motors into great little engines that go so much better all round compared to just race motors out the box.

keep up the good work guys.