- Joined
- Jun 23, 2011
- Messages
- 786
My 20 year old Bush Hog has been a problem since day one. The engine, an 8-horse B&S, while a reliable runner, has a disgrace of a throttle mechanism. It was designed cantilevered off the side of the engine. On a good day, it does nothing more than creep down in engine speed until the engine is merely idling. An a bad day, it just falls off from vibration. After replacing it and having the same problems happen again, I decided to do somehting about it...
Off came the engine...
Here's what I needed to replace:
![DSC00167.jpg DSC00167.jpg](https://www.hobby-machinist.com/data/attachments/19/19565-053b03c7f1bbd9c1192f6b26c7795a5a.jpg)
So, I drilled and tapped four holes in the engine block to hold on a THICK plate. I mounted a kill switch in the plate. Then, came a bolt, a small L-bracket, etc to make a throttle that won't change in speed unless I adjust it - at a single speed. Next came a choke knob with two detents - one for on the other for off. The detents were made by machining two grooves in the choke knob. A setscrew holds in a spring and a ball bearing.
![DSC00164.jpg DSC00164.jpg](https://www.hobby-machinist.com/data/attachments/19/19566-9ddd98fcb00d6dc541db2f2f5202438d.jpg)
![DSC00165.jpg DSC00165.jpg](https://www.hobby-machinist.com/data/attachments/19/19567-4561a155e67fa52f3e784706cc98f9d7.jpg)
All made from scraps and junkbox parts. I think this'll hold up... Is it pretty? Nope! Hehehe.
John
![DSC00165.jpg DSC00165.jpg](https://www.hobby-machinist.com/data/attachments/19/19567-4561a155e67fa52f3e784706cc98f9d7.jpg)
Off came the engine...
Here's what I needed to replace:
![DSC00167.jpg DSC00167.jpg](https://www.hobby-machinist.com/data/attachments/19/19565-053b03c7f1bbd9c1192f6b26c7795a5a.jpg)
So, I drilled and tapped four holes in the engine block to hold on a THICK plate. I mounted a kill switch in the plate. Then, came a bolt, a small L-bracket, etc to make a throttle that won't change in speed unless I adjust it - at a single speed. Next came a choke knob with two detents - one for on the other for off. The detents were made by machining two grooves in the choke knob. A setscrew holds in a spring and a ball bearing.
![DSC00164.jpg DSC00164.jpg](https://www.hobby-machinist.com/data/attachments/19/19566-9ddd98fcb00d6dc541db2f2f5202438d.jpg)
![DSC00165.jpg DSC00165.jpg](https://www.hobby-machinist.com/data/attachments/19/19567-4561a155e67fa52f3e784706cc98f9d7.jpg)
All made from scraps and junkbox parts. I think this'll hold up... Is it pretty? Nope! Hehehe.
John
![DSC00167.jpg DSC00167.jpg](https://www.hobby-machinist.com/data/attachments/19/19565-053b03c7f1bbd9c1192f6b26c7795a5a.jpg)
![DSC00164.jpg DSC00164.jpg](https://www.hobby-machinist.com/data/attachments/19/19566-9ddd98fcb00d6dc541db2f2f5202438d.jpg)
![DSC00165.jpg DSC00165.jpg](https://www.hobby-machinist.com/data/attachments/19/19567-4561a155e67fa52f3e784706cc98f9d7.jpg)