Poulan Pro PR45Y22SB Throttle/Governor Issue

[lilychef]

Hi there! I am either missing a part on my mower, something is loose, broken, or detached, or something is out of adjustment. I've attached a picture of the throttle/governor linkage for you to see. I recently replaced the carburetor, and everything is hooked up exactly the way I found it. Nobody else has worked on this mower since we bought it. The engine will only either not start, or will start on full throttle, but the throttle control lever (the tortoise/hare lever) does absolutely nothing to control the engine speed. When it does start, it runs well, but only at full throttle. BTW - It ran before I changed the carb, too, but not as smoothly as now. That spring in the pic is VERY small and super-light, and doesn't seem to do anything. In all of the pics I've seen of similar B&S engines, there is another, much larger spring connecting the throttle lever to the throttle body. Could this be what I need? To makes things worse, B&S's own parts diagram doesn't completely match my engine, so they were no help on the phone and couldn't give me a part number for such a spring, if it exists. My engine model number is 10G902 0260 B1. Maybe I just don't understand how this all works, but it sure seems to me that the throttle lever should move the throttle plate, eh? Ha! Any advice would be greatly appreciated!

 

[Fish]

Looks pretty rough. It also looks like I can see the remains of the intake o-ring laying where the carb fits onto the tube, which would cause all kind of trouble.

He is a blowup, which shows parts from several setups.

 

[ILENGINE]

Everything looks like it is hooked up correctly. Is something binding the throttle someplace. the governor spring, even though small should open the throttle. the rod hooked to the throttle plate on the carb, should pull the engine out of thottle. So if the governor spring was too small the engine would only idle. I bet something is preventing the throttle from moving correctly, or the governor arm needs reset to the static governor position.

 

[lilychef]

Looks pretty rough. It also looks like I can see the remains of the intake o-ring laying where the carb fits onto the tube, which would cause all kind of trouble.

He is a blowup, which shows parts from several setups.

Thanks for the reply! The carb/o-ring, etc is all attached perfectly, and yes, that is the diagram I have been consulting; I was only doubting its accuracy because the governor arm shown is different than what's on the machine...

 

[lilychef]

Everything looks like it is hooked up correctly. Is something binding the throttle someplace. the governor spring, even though small should open the throttle. the rod hooked to the throttle plate on the carb, should pull the engine out of thottle. So if the governor spring was too small the engine would only idle. I bet something is preventing the throttle from moving correctly, or the governor arm needs reset to the static governor position.

The throttle lever and throttle plate itself move freely by hand, as does the governor arm, altho the governor arm does seem a bit hard to move. I'm not sure how to reset the governor arm, tho, that could be it. How is that done? Should I replace the governor spring in case it has lost tension? Thanks so much for the reply!

 

[lilychef]

Everything looks like it is hooked up correctly. Is something binding the throttle someplace. the governor spring, even though small should open the throttle. the rod hooked to the throttle plate on the carb, should pull the engine out of thottle. So if the governor spring was too small the engine would only idle. I bet something is preventing the throttle from moving correctly, or the governor arm needs reset to the static governor position.

Come to think of it, the governor arm was fairly difficult to move, and it even "popped" into a different position, as I remember. Do they need servicing as well as adjusting? Like lubrication? Or can they go "bad" and need replacing?

 

[ILENGINE]

May need to remove the blower housing to see if anything is binding the governor linkage. To reset the governor if it has moved, loosen the nut that holds the governor arm, move the throttle plate to the fast position which is toward the governor spring. watch what direction the governor shaft turns to move to the fast position, and while holding in the fast position, retighten the nut on the governor arm.

 

[lilychef]

May need to remove the blower housing to see if anything is binding the governor linkage. To reset the governor if it has moved, loosen the nut that holds the governor arm, move the throttle plate to the fast position which is toward the governor spring. watch what direction the governor shaft turns to move to the fast position, and while holding in the fast position, retighten the nut on the governor arm.

THANKS! I'm all over this... I'm also reading that some smaller mowers have an "air vane governor" than can get clogged up? Does this model engine have that type? I can't tell from the parts diagram... You have been very helpful.... I really appreciate it.

 

[ILENGINE]

You have the mechanical governor, not the air vane governor.

 

[lilychef]

You have the mechanical governor, not the air vane governor.

Excellent. Thanks once again! I'm sure I'll have this problem licked soon. The mower is at my girlfriend's rental house. so I'll report back once I'm able to get over there and work on it.