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'75 406.121, '79 406.121 & '80 406.120 (Lake Placid)
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After reading Jack's quotes went back and re-read my parts manual. It does say 25.4 and 31, but next to the two it says parenthetically the 31 mm is 7/8 " and the 25.4 mm is 1". I'd say the 31 mm is another Case misprint and the 25.4 is the heavier spring!!!
 

· Registered
'75 406.121, '79 406.121 & '80 406.120 (Lake Placid)
Joined
·
459 Posts
Jeff - I would suggest you get/borrow a caliper and measure the diameter. Very hard, if not impossible to make an accurate determination as to size otherwise.
 
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