1972 Chrysler 20hp Model 203HD

Trying different approaches to getting this motor running properly and was hoping someone could assist me setting the RPM's. I have read that there is a Bolt and Lock Washer on the side of the engine, but that is as far as I have gotten...

Familiar with most other parts of this engine, but not heard of a RPM adjustment capability...

Here are a few engine pics...Maybe you can see it here...

Thanks for any help you can offer

Picture #4 shows an idle stop adjustment on the right side of the picture.--------The full throttle ( high speed ) stop should not be adjusted.------If the motor has no power then you have to trouble shoot as to what is the problem.------This motor can and will run on one cylinder only and it would not have a lot of power.

Is this is the culprit...or the long bolt above it.
Normally, I adjust the long bolt to match up the carb roller arm with the throttle close mark and kill button on the stator plate.
Is this what you are saying is used to adjust the RPM's...?


Thanks, Gives me a starting point.

Yea, I have been trouble shooting for awhile.
Just had shipped new condensers.

Did a few other things:
Cleaned Carb Replaced Gaskets, Set Float
Adjusted Low Idle to best running position at 1 1/4
Compression at 113 psi per cylinder
New Fuel Diaphragm installed, Reeds sitting level
Fuel Hoses replaced with in-line paper filter installed
New gas non-ethanol marine
Replaced Cylinder Head with new Gasket installed. No scoring within cylinder.
Ignition coils Ohm checked at 700 primary and 684 secondary.
Ignition Laminated Coils/Magnito cleaned.
Have on order new condensers.
New coupling O-Ring
Points well cleaned/gaped to .020 and producing good spark.
New Plugs NGK BR6HS gaped to .030.
Rebuilt Impeller Housing / replaced seals.
All work done as per Chrysler Tech Manual.
Rebuilt lower gear housing / replaced all seals.

I have 3 of these with one running like a top.

The other 2 twins aren't as cooperative...LOL

Thanks