H40 HS50 Exhaust Screws

PatrickCraik

Well-Known Member
#1
Hello, Are the blocks threaded to 1/4-20? I checked the screws from my HS50 and they appear to be 1/4-20 but they're bent and new screws dont thread in very well. Not sure if the threads in block need to be cleaned up or Tecumseh used an oddball proprietary thread. Thanks
 

Biffmini

Well-Known Member
#3
Hello, Are the blocks threaded to 1/4-20? I checked the screws from my HS50 and they appear to be 1/4-20 but they're bent and new screws dont thread in very well. Not sure if the threads in block need to be cleaned up or Tecumseh used an oddball proprietary thread. Thanks
1/4-20 they are
 
#4
Get a 1/4-20 tap and clean up ("Chase the threads") in the block- use plenty of cutting oil. In a pinch, and if you are a cheapskate, (not saying you are) you can try using a Grade 8 1/4-20 bolt and do the same instead of the tap if they are not boogered too bad.
Michael
 
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