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Cranck case cover by Motowheels
Posted: Fri Apr 06, 2007 7:13 pm by wim1000
View: 700
 
  Users Personal Galleries - Personal Gallery of Growl
 
with 3/8" bit
620 muffler mod-after enlarging

620 muffler mod- the hole
Using the aluminum angle stock as a drill giide.

I drilled 1 hole in left (clutch lever side) exhaust outlet, increasing bit size from 3/16" at first to 3/8" finally.  This penetrates into the chamber that the gases first enter from header pipe.  The metal is soft... drilling took 10 minutes, if even.
620 muffler mod-drilling
Long 3/16" drill bit (followed by 1/4" bit then 3/16" bit)
Aluminum angle stock to guide drill bit so it does't flex and dance around (and to keep visible part of exhaust pipe from being scratched).
620 muffler mod-tools
 Posted: Tue Dec 25, 2018 10:30 pm 
View: 20
 Posted: Tue Dec 25, 2018 10:29 pm 
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 Posted: Tue Dec 25, 2018 10:28 pm 
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 Posted: Tue Dec 25, 2018 10:20 pm 
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