Ferris 400S Series RPM

M

MParr

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Skippydiesel said:
Hi MParr,

That was the video I saw before attempting to get a little more no load rpm.
Thought I had done it with an increase from 3000 - 3300 rpm.
Dont know what happened after that - was messing with the springs. Anyhow I noticed that the governor shaft had rotated 1 flat (It's got a hex end like a bolt) anticlockwise and would not turn clockwise (to the right). From then on had no governor action at all.
I am going to have to remove the engine from the mower. Open the shaft end crankcase and see what has happened internally.
Click to expand...
You had better find a repair manual before cracking the crankcase on that new engine.
 
M

MParr

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Skippydiesel said:
Hi MParr,

That was the video I saw before attempting to get a little more no load rpm.
Thought I had done it with an increase from 3000 - 3300 rpm.
Dont know what happened after that - was messing with the springs. Anyhow I noticed that the governor shaft had rotated 1 flat (It's got a hex end like a bolt) anticlockwise and would not turn clockwise (to the right). From then on had no governor action at all.
I am going to have to remove the engine from the mower. Open the shaft end crankcase and see what has happened internally.
Click to expand...
I don't think that you're doing your friend any favor with his new
engine.
 
Last edited:
Craftsman Garage

Craftsman Garage

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@MParr where is the high idle adjustment? My briggs is only at 3k with the throttle pushed all the way up.
 
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Auto Doc's

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There is a tab for the larger governor spring that has to be bent out slightly to increase or decrease the tension on the spring. The tab is hidden by the lower throttle linkage plate that bolts to the engine near each head.
 
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Skippydiesel

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Update!
Opened the B&S - governor mechanism in bottom of engine - evidence of overspeed.
Cleaned all the debris using a magnet.
Could not find any other damage.
Replaced governor mechanism using parts from another dead engine (same series).
Reassembled - hope to start tomorrow - wish me luck.
 
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hlw49

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When you set the static gov adjustment be sure you are torquing the gov arm clamp bolt to 130 inch lbs. That sounds like what happend in th first place. If the rpms are still too slow you then bend the tab where the large gov spring hooks that is part of the speed control bracket. Sounds like a lesson bought.
 
M

MParr

Lawn Addict
Joined
Jul 2, 2021
Threads
7
Messages
1,679
Skippydiesel said:
Update!
Opened the B&S - governor mechanism in bottom of engine - evidence of overspeed.
Cleaned all the debris using a magnet.
Could not find any other damage.
Replaced governor mechanism using parts from another dead engine (same series).
Reassembled - hope to start tomorrow - wish me luck.
Click to expand...
🤦‍♂️
 
S

Skippydiesel

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Nov 29, 2020
Threads
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Messages
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hlw49 said:
When you set the static gov adjustment be sure you are torquing the gov arm clamp bolt to 130 inch lbs. That sounds like what happend in th first place. If the rpms are still too slow you then bend the tab where the large gov spring hooks that is part of the speed control bracket. Sounds like a lesson bought.
Click to expand...
Thanks for that advice/observation - been torquing to "wrist click" will now get the torque wrench out.

Advice on idle spring static setting would be much appreciated.

Thanks
 
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