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1968 Bolens 850 governor spring tension setup


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#1 mgschwendtner OFFLINE  

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Posted May 14, 2015 - 06:37 PM

I have looked at lots of pictures online of how people have setup their governor linkage and mine is drooping quite a bit on the points cover. I will attach pictures of my setup, throttle is set at idle. I am not satisifed in how it currently operates. It has a habit of surging way over 3600 when i go full throttle and then settles back down. I play around with it and it doesn't behave how i expect that it should operate. This engine was rebuilt completely .10 over.

 

For all of those who noticed, why yes that is a brand new zenith carb purchased directly from Zenith. I spoke with a parts guy when I inquired about a new carb, he said the S8D's were no longer avalable, but I could order one for a S7D and change out the main jet with the correct one for a S8D.

 

Do you go for 3600 RPM for full throttle and what do you use for idle?

 

Thanks!

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#2 chieffan ONLINE  

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Posted May 14, 2015 - 06:55 PM

Looks to me like you need to slide your throttle cable further forward till the arm rests against the stop pin and your throttle lever is in the full idle position..  Then you need to shorten the rod between the arm and spring till it is just snug and not pulling on the spring.  I think that will solve your problems.  Good luck.



#3 mgschwendtner OFFLINE  

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Posted May 14, 2015 - 07:56 PM

Chieffan,

 

I followed your advice and moved my throttle cable up and took adjusted the rod. It runs much better now, except the throttle knob now has more travel when I apply full throttle to the point where the friction turn stop no longer engages. The engine will also go above 4000 if I pull it out too far. I am wondering if i need to replace my throttle cable. Should I feel a hard stop when I pull out the throttle to max?



#4 Bolens 1000 ONLINE  

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Posted May 14, 2015 - 08:00 PM

:ditto:

 

Move your cable until the arm just about rests on the pin.

 

What is the serial number of that engine? There were 2 different springs for the governor rod on these early models.

 

Also have you reset your governor lever correctly after the engine rebuild?



#5 chieffan ONLINE  

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Posted May 14, 2015 - 08:03 PM

I have three of the pull twist to lock throttle set ups and have never run into the over rev situation or the throttle coming out to far that it won't lock.  Sound like your turn to lock control is defective but wait for aomeone with more knowledge of those throttle controls than I have.  The ones I replace were stuck solid.

 

Also that third tab on the arm where your throttle wire attaches should contact the stop pin when at full throttle.  Is that tab missing off the arm?  Possibly the wrong spring on the govenor link?



#6 Bolens 1000 ONLINE  

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Posted May 14, 2015 - 08:04 PM

You may need to move your spring up a few holes to lower those RPM's , these should never really be run at or over 3600 without a load



#7 mgschwendtner OFFLINE  

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Posted May 14, 2015 - 08:04 PM

serial is 4435944



#8 mgschwendtner OFFLINE  

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Posted May 14, 2015 - 08:18 PM

There is no way that I can hit the stop pin on the 3rd tab unless i really pull the throttle out and the rpms shoot really high. I have a 47 coil spring and a 5 inch adjusting screw. Manual shows that I should have 5 1/4 long one. Eventhough it is 1/4 inch short I dont think it will make a difference, its not like I am backed all the way to the end and really need that 1/4 inch of legnth. How accurate are those holes on the governor level?



#9 Bolens 1000 ONLINE  

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Posted May 14, 2015 - 08:18 PM

serial is 4435944

 

Should have spring PM200A then with 47 coils



#10 Bolens 1000 ONLINE  

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Posted May 14, 2015 - 08:22 PM

I would say check your governor lever adjustment

Procedures are in the service manual



#11 mgschwendtner OFFLINE  

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Posted May 14, 2015 - 09:03 PM

I readjusted the governor lever. it almost seems like the govenor is sticking when the engine is running but moves freely when it is turned off. I will go from idle to full throttle, the rpms will increase a bit then not change as i keep pulling back on the throttle.  I get to a point where the govenor lever slips and it speeds up consideribly. The govenor will react and slow the rpm down. I keep going and the rpm stays constant and then it will slip again, speed up and the govenor slows it down again and then I end up at full throttle. I dont want to blow the engine up.



#12 mgschwendtner OFFLINE  

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Posted May 15, 2015 - 07:44 PM

I opened up the engine today and from what I can tell the internal governor gear assembly looks OK. I looked up and for around 35 dollars I can replace the governor gear, new gasket, new shaft and vane that is inside the engine. That wil replace all the internal moving parts and if I still have problems it is external to the engine. I really dont want to tear it off the tractor and open it up again. The couner weights and center pin work and dont bind up. The teeth look good and mate to the cam shaft.



#13 Bolens 1000 ONLINE  

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Posted May 16, 2015 - 06:56 AM

I would say its something external , are you sure the governor lever is not sliding loose on the shaft?



#14 chieffan ONLINE  

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Posted May 17, 2015 - 08:08 AM

You might try changing the clamp bolt on the Governor arm. If the threads get damaged that bolt will stop turning into the nut and not have the clamp tight yet.

#15 mgschwendtner OFFLINE  

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Posted May 17, 2015 - 06:53 PM

I am pretty sure the govenor clamp was tight and wasn't moving. When I put it all back together I will double check. The bolt threads are in good shape.


Edited by mgschwendtner, May 17, 2015 - 06:53 PM.





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