How can I make a replacement throttle linkage ?
#1
05-31-19, 08:04 PM
How can I make a replacement throttle linkage ?
I have an old Tecumseh MH80 mounted on a Roto-Hoe 990-5 tiller from the late 70s. I lost the linkage that runs from the throttle control bracket on the blower cover to the governor on the opposite side of the engine (crank cover?). There is another linkage that runs from the governor to the throttle on the carburetor. Anyway, the first one (throttle control to governor) needs to be replaced. How do I know what length to make the linkage?
#2
06-01-19, 04:02 AM
Group Moderator
Take a look at the end points you need to connect and measure. Make sure you move the levers to the correct position before measuring.
#3
06-01-19, 06:21 AM
Don't know if that one was this way or not, and you could make it like this anyway to give yourself some leeway, but some of those linkages are bent with a "U" someplace in them so that you can shorten or lengthen the rod to fine tune it a bit by opening or closing the "U". And or course one end often has a squared off "S" bent in one end, so that it stays in the hole and you only have to secure the other end of the rod.
#4
06-02-19, 08:12 PM
The reason for my concern is that I have read thar if the linkage is incorrect it can lead to over-revving and engine failure. That being said... how do I know the positions of the governor and throttle in order to measure the distance? The governor move left and right and the throttle control bracket is spring loaded and thus able to move left and right. What positions should they be in? The throttle control bracket is show on the following website... https://www.amazon.com/Tecumseh-3467.../dp/B00DHHIRC6 Maybe I should just make a linkage and put it on and see if the revving sounds ok? Am I risking anything?
#5
06-03-19, 12:39 AM
Forum Topic Moderator
Leave the governor arm where it is and open the carb to full throttle. Then the distance between the holes in each is what the length of the linkage needs to be. You'll probably never get it 100% exact, so then you'll reset the governor to be in the correct position to work with the new linkage.
