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Magnum 20 governor spring
Can some of you guys please tell me about the different types of spring on the Magnum 20 Governor? What are the different part number or colors for the rpm? My Magnum is running at 2800 now, and I would like to get the 3600 out of it. Thanks in advance..
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As far as I know, there is only one available spring. (For a GT application. A gen set might use a different spring.) The high idle no load speed is adjustable. The procedure is in the service manual.
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Jonathan maybe you can give me a few tips on how to get more rpm. When I try to increase it the governor will hold the throttle wide open and it runs like crap. If I just touch the governor arm with very little pressure it returns to the 3600 rpm I set it at, that’s why I’m thinking there are different springs for different applications,
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What you say doesn't make a lot of sense, so lets knock that out first. You say that when you increase throttle the governor will hold the throttle open and it's runs like crap. If the governor is trying to hold the throttle WOT, then it would appear it is doing it's job. If the engine doesn't run well, that has nothing to do with the governor. The governors only job is to regulate RPM. It's only control or function is engine speed. It's can't make it run good or bad, it can only regulate speed or it can't. You go on to say that if you just touch the governor arm with very little pressure it returns to 3600 RPM where you set it. By my total understanding of a governor, you are trying to slow it down, by pushing against the spring. This indicates you have two issues: 1.) You do not have the governor set correctly and 2.) You have some kind of running issue. Likely something either not set right on the carb, or an issue of some kind with it. Now.... back to the governor spring. I refuse to look through the likely 100 different spec numbers to see if more than one spring is available for the M20. There likely is.... but what I know for certain, is that there is only one spring for the spec number of your engine in the particular CC tractor it is in. I doubt the spring is the issue. If you suspect it is the spring, and it eases your mind, order a new one. It's likely about $15. Here's a crash course in governors. All they are is a balance beam. Picture in your mind a teeter todder (balance scale) on a playground. On one end is a spring connected to the ground. On the other end, you put a weight on the seat until the scale is balanced. The more pressure you put on the spring (dash throttle lever) the more weight (governor flyweight) it takes to balance the scale. The different holes in the governor arm to attach the spring is like moving the spring toward the center of the scale, or close to the seat. Most everyone understands physics enough to know that the close to the center of the scale the spring is, the less weight it takes to balance the scale. The close the spring to the seat, the more weight it takes. Even if the spring on the engine isn't the correct one, you should be able to get it to work. There wouldn't physically be that much difference between say a gen set spring and one for a GT. (Lets not get too deep here.) So.... read the book again, and tune the carb, set the high idle no load speed using the throttle stop on the arm that the dash cable is attached to and see what you get. If you think you need a new or different spring, then order one..... but it likely isn't going to fix the issue unless someone put a hardware store spring on it, or the one on it is completely wore out. As in, if you take if off it has gaps in the spring coils because it's lost it's "spring". |
Thanks I will mess with it tomorrow and keep you updated. Also how can I post a video of it for you to see
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Ok where can I get Kohler part number 52 091 04s
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Cub cadet, ebay, Kohler..... anywhere you want.
I still don't think you need a spring. |
I tried Kohler they said it was nla, and i think you are correct about the hardware store spring, the one end was crimped really bad. It looks like they shortened it compared to pictures i see. Please let me know if you find one
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I should clarify that the Kohler is not in a Cub Cadet sorry guys i see the Cubs are different
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Looks like this place has them available. https://www.cubcadetpartsnmore.com/m...continued.html
But please contact the sponsors above first. |
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The one I have the linkage is bolted to the carb on the 2072 it’s bolted to the intake manifold and is a different spring
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Listen, I can't help you if you don't cough up some info.
I need: 1.) The engine application, or model spec numbers. I'd rather have both. 2.) A picture of your set up I'm still going to say that the spring won't affect how it runs, only how it regulates speed. Where's the video you said you would post? |
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Number 8 is the spring I need
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Model number m20qs ....... serial number 1908213506.......... spec number 49514 thanks for your help guys
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The engine is in my power king 1620
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So... I see what you have now. That helps. That throttle set up is the oddball one, which is likely why the discontinued the spring. That, and lets be honest, it's a 30+ year old motor.
Lets go back to the hardware store spring comment..... when I said that, I meant like a completely off the wall spring. Like too big, too short, too stiff. But in this case, a hardware store spring is likely what I would do... but I understand how the governor needs to work, so I can find a spring close enough to do the job. Just because the end of your spring looks "crimped" doesn't mean that it isn't an original spring. The end may have just worn off of it and they spun up another coil and bent the hook on it. Doing so wouldn't affect anything, as long as they rechecked the high idle no load. SO...... back to the REAL issue. Why do you think the spring needs replaced? How about a picture of the spring on your engine, in the tractor. This is the last time I'm saying this..... I really don't think it sounds like the spring is the issue. I'm pretty sure at this point you are going on a wild goose chase after a discontinued part that isn't going to do anything to fix the issue you have. |
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Here are some pictures. When I tried to increase the rpm from 2500 to 3400 when the engine is under a load the throttle will go wide open and floods the engine but if I put it back to 2500 it runs great 👍 again thanks for the help
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That spring is fine. Nothing wrong with it at all. BUT.... it is in the wrong hole on the governor arm. You need to move it in to the third hole at least. Attachment 95995 Honestly, the throttle cable is in the wrong hole too. It's supposed to be in the top hole. |
I see green fuel line. Doesn't look like the right size hose. I also see the fuel pump isn't hooked up. How does this engine get fuel? No way the tank is high enough to gravity feed...... Looks like you have lots of issues you need to fix. :bash2:
Throttle may go wide open, but it's starving for fuel, not flooding it. Looks like you have a fixed jet Walbro on this thing. See how much posting a picture helps??? That why we asked for it. |
I have a electric fuel pump. Low pressure and yes it is the fixed main jet. The engine runs great but when I tried to increase the rpm is when I have the issue, it seems like to much tension on the spring and the governor can’t really correct it, I even tried the different holes on both linkages.
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I just wanted some more blade speed for the high lift blades
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The spring looks stock to me. Dash lever controls the tension. If the engine won't rev past 2400 without choking to death, you have an engine issue. Plain and simple. If the throttle plate is all the way open and the engine isn't trying to run away, the governor is working.
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I found a nos spring seems to help a little, it runs great at 2900 rpm any higher and it bogs out
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One hole what way? Towards the governor shaft or away?
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