govenor stop pin ???

only1stegall · #1 09-24-2011, 12:26 PM

can some one explain the stop pin to me? whats the point of it? Ive trying to figure out what the governor doesn't work on my 149..

_DX3_ · #2 09-24-2011, 12:49 PM

The stop pin is what keeps the governor gear on the stub shaft. Once the gear is in place, the stop pin (nothing more than a screw with a long skinny end) is screwed into the threaded hole beside the governor shaft bushing and the protruding end crosses in front of the gear and keeps it from coming off the stub shaft.

If you are able to slide your gear back and forth significantly then it is possible your stop pin is broken. You may need to remove it and look at the end and see if it has broken off.

only1stegall · #3 09-24-2011, 01:16 PM

alright...

maybe you can help me understand one last thing before I tear this entire engine apart...

i understand the procedure for setting the governor arm and xshaft..

i understand the basic function of the governor gear and how it works..

what I do not understand, is how I set the maximum engine speed.

Does the governor just automatically know to limit at 3600? because mine isnt...

im just a little lost with this entire thing.

_DX3_ · #4 09-24-2011, 01:24 PM

You need to buy a tachometer for a single cylinder engine to set your RPM's correctly.
To set the high rpm governor speed, place one end of the governor spring in the middle to lower hole in the "L" shaped governor lever, and place the other end of the spring in either the top or second hole from the top in the short lever that's located under the carburetor or on the flywheel shroud. (Follow the Kohler Service manual for this step.) It's best to use a small engine tachometer to determine the exact rpm to prevent over-revving of the engine, which could cause the connecting rod to break. The high speed governor limit for a stock engine is set at 3,600 rpm

I am going to purchase one of these when I get my 128 finished and am ready to start the motor.

http://www.tinytach.com/tinytach/index.php

_DX3_ · #5 09-24-2011, 01:29 PM

Here is another good Governor adjustment link:
http://cubfaq.com/govadjust.html

darkminion_17 · #6 09-24-2011, 03:33 PM

Everyone likes pictures.Here are more helpful ones.

only1stegall · #7 09-24-2011, 04:37 PM

So what sets the actual engine RPM ? the high speed bracket? or the govener?

If it is the bracket that is simply limiting the amount of travel, then whats the point of the governor.

Some one please educate me.. my tractor doesn't have that high speed bracket... perhaps im chasing my tail ???

_DX3_ · #8 09-24-2011, 04:41 PM

With your air cleaner removed, get us a picture of your carb and Governor arm setup and the springs. Pictures can say so much.

_DX3_ · #9 09-24-2011, 04:52 PM

How governor's work:
http://www.small-engines.com/govtheory.html

only1stegall · #10 09-24-2011, 04:54 PM

It is all taken apart right now because i've been messing with it...

I have read and studied the procedure for making the initial setting of the governor.

I just don't understand exactly what all is happening, and what is actually limiting the rpm on the engine.

See the attached picture :

As seen in the RED box, my linkage and spring looks exactly like this when together. I set it like this per the FSM description

As seen in the BLUE box, this " high speed stop" bracket is gone form my tractor. Is THIS the limiting factor?

As seen in the GREEN box, this is no present, as I have a throttle control cable coming from the dash board instead.

Maybe this clears it up a little...

If the bracket is was ultimately controls the RPMs then that's my entire problem, but I dont think so.

The way I understand it, the weights on the governor gear directly action the pin in the end of the gear to physically close the throttle when the red line RPM is reached? Right? This doesn't happen, and the tractor will run out way past 3600. I saw 4400 flash the other day just trying to see if I wasn't allowing it to get up to speed enough or some thing...