301 High Speed adjustment

[Mr Magoo 226]

I am trying to dial in the speed adjustments on my K301. I have a tach and have got the low idle right where it should be around 1200 rpms. The pictures in the downloaded copy of the engine manual are so poor I can't make out any details of the parts. I am trying to understand what part it is that I need to adjust the high speed. There is a graphic of the parts, but what I have on my C-120 does not look exactly that. Mine does not have the speed adjusting nut and rod that is shown. 

 

The manual says to 1.Loosen the lock nut on the high speed adjusting screw. 2. Turn the adjusting screw in or out until desired speed is reached. Tighten the lock nut.  

 

On this one I have would you have to adjust the high speed with the throttle cable? 

 

 

[Mr Magoo 226]

This is the drawing from the manual. 

 

[Stormin 9,985]

  Looking at your first photo the high revs mixture screw is on top. The diagram shows governor adjustment. If the rod from carb to governor arm is missing, you need to get one. Otherwise you could over rev the engine.

[ebinmaine 72,728]

Your engine differs from the manual and is normal for a Wheelhorse.

 

Looking at the screenshot of your engine I made...

BLUE dot on the NUT you'll be ADJUSTING.

 

Red arrow pointing toward the "arm/tab" that moves.

WHITE arrow showing direction to move arm to SLOW engine.

 

Check engine RPM.

Determine which way to go with the tab.

Loosen nut.

Move tab.

While tightening the nut the tab will want to move back so watch it carefully.

Small adjustment can mean alot.

Repeat as necessary....

 

[Mr Magoo 226]

4 hours ago, Stormin said:

  Looking at your first photo the high revs mixture screw is on top. The diagram shows governor adjustment. If the rod from carb to governor arm is missing, you need to get one. Otherwise you could over rev the engine.

Sorry but that is just not correct. If you are referring to the main fuel needle screw, that is not where to make rev adjustments. That screw adjusts the mixture. You should never adjust the mixture to change the rpm speed. 

 

Changing the RPM speed has to be a mechanical adjustment in the linkages. 

[Achto 29,405]

5 minutes ago, Mr Magoo said:

Changing the RPM speed has to be a mechanical adjustment in the linkages. 

 

@ebinmaine's explanation is spot on. The tab that he points out with the red arrow is a stop to adjust how far the governor spring can be pulled. This will adjust the speed of the engine.

 

7 hours ago, Mr Magoo said:

 

This drawing is showing how to make adjustments on a single speed engine, like for a generator for example.

[Mr Magoo 226]

3 hours ago, ebinmaine said:

Your engine differs from the manual and is normal for a Wheelhorse.

 

Looking at the screenshot of your engine I made...

BLUE dot on the NUT you'll be ADJUSTING.

 

Red arrow pointing toward the "arm/tab" that moves.

WHITE arrow showing direction to move arm to SLOW engine.

 

Check engine RPM.

Determine which way to go with the tab.

Loosen nut.

Move tab.

While tightening the nut the tab will want to move back so watch it carefully.

Small adjustment can mean alot.

Repeat as necessary....

 

Eric that piece is not fixed. It has to be able to rotate back and forth with the throttle cable. The holes in both of the plates that the spring is attached to are for adjusting the governor sensitivity according to Kohler. They would not give you enough fine adjustment to set the RPM's.

 

I did some more thinking on this this morning after staring at the picture. The way this is put together, I think the adjustment either has to be at the attachment point of the throttle cable or possibly in the screw that has the ball attachment on the end of the throttle shaft. If there is enough travel in and out in that screw.  I can pop off the ball, loosen the lock nut and adjust the screw in and out. 

[Mr Magoo 226]

2 minutes ago, Achto said:

 

@ebinmaine's explanation is spot on. The tab that he points out with the red arrow is a stop to adjust how far the governor spring can be pulled. This will adjust the speed of the engine.

 

 

This drawing is showing how to make adjustments on a single speed engine, like for a generator for example.

Okay, you posted just as I hit post on my last.

 

So, the tab can move. I could not see that. under the dirt! I will definitely check that out. Makes perfect sense. Thank you guys!

[Mr Magoo 226]

3 hours ago, ebinmaine said:

Your engine differs from the manual and is normal for a Wheelhorse.

 

Looking at the screenshot of your engine I made...

BLUE dot on the NUT you'll be ADJUSTING.

 

Red arrow pointing toward the "arm/tab" that moves.

WHITE arrow showing direction to move arm to SLOW engine.

 

Check engine RPM.

Determine which way to go with the tab.

Loosen nut.

Move tab.

While tightening the nut the tab will want to move back so watch it carefully.

Small adjustment can mean alot.

Repeat as necessary....

 

Thanks Eric! I did not get what you meant about the tab moving. Incidentally, all this crud was cleaned off after I took the picture, so I should be able to see what is going on now. 

 

I got my new on yesterday with new bearings and it is rolling great. Also changed out all of the ground wires, batter cables, and wire going from the solenoid to the starter. It is really purring now.  

 

The little tachometer I got for $10.00 really worked great. 

 

[The Tuul Crib 7,339]

Where did you find that tachometer? 
Looks like a handy little tool!

[gwest_ca-(File Mod) 11,492]

I struggled the first time I set the max rpm but went to a method that works quickly.

Use the dash throttle control to set the rpm you want.

Loosen the bolt and pivot the L-bracket so it is up against the linkage. Snug the bolt up.

Lower the rpm and bring it back up to max rpm.

Check the rpm. Make further adjustment by tapping the L-bracket back and forth with a hammer and punch or lever to pry it.

Keep checking max rpm. When you get it zero'd in tighten the bolt a bit more to hold it.

 

Garry

[ebinmaine 72,728]

@gwest_ca

Garry do you have a diagram or an explanation of what is supposed to be on that bolt, exactly?

 

I don't know if you saw it in one of my other threads but I've tried to set the idle on the Cinnamon Horse three times now.

I struggle while I am doing it to keep that tab in place because it rotates in the direction of increasing idle while the bolt is being tightened.

 

I'm wondering if I am missing a spacer or washer or something like that? Something that would make that L bracket not want to move so easily with the bolt.

 

 

 

@Mr Magoo I have that same tachometer. Works well.

[Achto 29,405]

1 hour ago, The Tool Crib said:

Where did you find that tachometer?

 

Here is one source Crib.

https://www.amazon.com/Digital-Photo-Laser-Tachometer-Contact/dp/B001N4QY66

[Mr Magoo 226]

1 hour ago, The Tool Crib said:

Where did you find that tachometer? 
Looks like a handy little tool!

I bought it on eBay. There are lots of them on there from different sellers. The seller I bought it from only has it listed as coming out of the UK now which is strange. I paid $9.99 + tax for mine. Shipping was free. 

[Mr Magoo 226]

1 hour ago, gwest_ca said:

I struggled the first time I set the max rpm but went to a method that works quickly.

Use the dash throttle control to set the rpm you want.

Loosen the bolt and pivot the L-bracket so it is up against the linkage. Snug the bolt up.

Lower the rpm and bring it back up to max rpm.

Check the rpm. Make further adjustment by tapping the L-bracket back and forth with a hammer and punch or lever to pry it.

Keep checking max rpm. When you get it zero'd in tighten the bolt a bit more to hold it.

 

Garry

I actually read somewhere in a Kohler publication or a Wheel Horse manual where it talked about bending the tab to adjust the speed. I did not know what tab they were talking about at the time. 

[ebinmaine 72,728]

3 minutes ago, Mr Magoo said:

bending the tab

That tab won't be bent without heavy equipment.

 

 

You'll have to loosen that bolt.

 

You may be able to leave it fairly snug & tap the tab up with something. But it won't bend. You'll have to move it.

 

 

[Mr Magoo 226]

I'm thinking I could fabricate a bracket with an adjusting screw that would attach to the shroud. It can push against another angle bracket attached to the flat piece that the throttle cable attaches to. I may make completely remake that piece also. The arrangement just needs a better means of an adjustable mechanical stop.

[ebinmaine 72,728]

Just now, Mr Magoo said:

. The arrangement just needs a better means of an adjustable mechanical stop.

 

 

I  think once you get in there and fiddle around with it a bit you'll figure out that the little tab works okay.

 

[gwest_ca-(File Mod) 11,492]

I looked up an engine I thought I was familiar with but the parts are not circled so don't apply to this spec number. The items around #13 are what I would expect to see. The spacer is stepped so the moving lever fits over the small end of the spacer and pivots on it. 

https://www.partstree.com/models/k301-47421-kohler-k-series-engine-made-for-norcar-12hp-9kw/governor-tp-2097-25/

The L-shaped bracket shows holes in both ends. The exposed one could accept a screw driver so it could be twisted to achieve the desired position to get max rpm limit. I don't recall seeing holes in mine.

.

A second page for remote throttle shows the parts also but I did not compare part numbers. Circles apply to the listed spec number - 1977 C-120

https://www.partstree.com/models/k301-47421-kohler-k-series-engine-made-for-norcar-12hp-9kw/remote-throttle-24-10-10-tp-2097-7/

 

Garry

[Stormin 9,985]

5 hours ago, Mr Magoo said:

Sorry but that is just not correct. If you are referring to the main fuel needle screw, that is not where to make rev adjustments. That screw adjusts the mixture. You should never adjust the mixture to change the rpm speed. 

 

Changing the RPM speed has to be a mechanical adjustment in the linkages. 

 

I stand corrected and somewhat  embarrassed.  I miss read/understood your post. Senior moment. I was thinking mixture somehow and not revs.

Edited January 30, 2020 by Stormin