How to tame a 9N?

TVZ

Member
My 9N would not run much above idle speed. After much experimenting, I decided maybe a new governor would be my ticket. I guess I was right?now it wants to rev like crazy! I have bent the linkage running down to the governor from the throttle to effectively shorten it, as prescribed, so if I force the throttle all the way up, it will slow down to a reasonable idle. However, when I stop applying the force, the governor forces it back and again revs the engine. Any ideas?
 
TVZ, your 9N should have a bracket or stand at the front end of your throttle rod bolted under two of the head bolts. Look at the end of the throttle rod and there should be two pins sticking out with ball ends. A spring goes on each of these pins.Is the spring still there?
 
Yes, Den, the spring is there.

Even if I completely disconnect the throttle linkage and just move the governor arms by hand, I can't get below about 750 rpms. If I disconnect the governor from the carb, I can get it to go as slow as I want. I have the max. speed stop screw all the way in. Can you think of anything else for me to try? Thnx...
 
Sounds like too much preload on the main spring. Should not be any preload or slack on that spring.
 
It's not visibly loose (see photo), but when I touch it, there is no looseness. So would I just remove it and use a vice and pliars to lengthen one of the attachment hook-ends? Any tips for a not-so-mechanical person?
<image src="http://forums.yesterdaystractors.com/photos/mvphoto2207.jpg"/>
 
Ok, I managed to lengthen the spring a bit so there definitely is no preload on it; however, it didn't make much difference.

I shortened the throttle linkage so if I force the throttle handle all the way up, the engine slows down to a reasonable idle. However, when I release it, the governor forces the linkage to bring the handle down, making the engine return to about 800 rpms. Would it make sense to bend the throttle linkage in a way that creates more friction between the handle and the quadrant plate notches? Or would that be harmful in some way? Would I be forcing something to do something that's bad for it?
 

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