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Discussion Starter · #1 ·
I have not had much luck with the search, and have read a couple of opinions on the correct way to measure the secondary pretension.
1) Measure the force it takes to start the rotation of the sheave, and the force at which it begins to release, and take the average of the two (i.e. clutch starts to rotate at 20lbs pull, holds steady, and starts to release back at 14lbs. This would give you an average of 17 lbs)
2) Simply measure the force at which the sheave starts to rotate (i.e. clutch starts to rotate at 20lbs pull)

Now these methods give you a different reading of 3 lbs, that is fairly significant. What is the proper way, and any other suggestions.
 

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use pull & release readings divided by two. This will help prevent using a fatigued spring that you may have in a box. Be sure to document measurements when spring is new for this to be useful.
 
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