mercury 650ss 1967 4 cyl

[antman]

starter motors ......just fired it up  well it didnt .  broke the shaft on the starter holding the small gear
..used it twice over the last two years ... had diaphram trouble in the fuel pump  .. replaced it and never got back out
pulled it out for spring and whammo
also bought a internal wiring loom cdi  for it
was starter no 50 37274 have spare  but part number 50 58788
doesnt have tapped thread for the starter solinoid  in the casing but (
can i use it  ?or is the gear on top not suitable for the flywheel
thanks ant

[MERCMAN]

I've not head of the pinion gear breaking off!!
Pull the spark plugs out and make sure you can rotate the flywheel easily by hand, before proceeding with anything else.

Mercury were very clever at using the same components on quite a number of models, thus saving huge tooling costs. I'm not familiar with the Part Numbers you have quoted. However, small enhancements to existing components did always necessitate a new Part Number.

In the 60's and early 70's there wasn't a different Flywheel for every Horsepower in a given year of manufacture.

Without seeing the two components side by side, I'd say give it a go.

MERCMAN.

[MERCMAN]

Ant,
You may like to watch these Duelling 650's

https://www.youtube.com/watch?v=gzLf8pGNfNU&t=3s

MERCMAN.

[antman]

Thanks Mercman
video was cool they pretty quick
the starter shaft broke under the pinion gear just wehre a littke hole is to take the end of a spring that sits under the pinion gear
maybe a little corosion and time
 put the spare on . had a weight under pinion gear and no spring slightly different but same main body and mounting holes .
google said it would fit multibale motors of that era   .
starts well and didnt smash anything ( did spin motor by hand first )
up and running again .after new fuel diaphram internal loom and startermotor
another test .

[MERCMAN]

I admire your persistence Ant.

MERCMAN.