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2008 450 EXC-R exhaust pops after revving

3.9K views 6 replies 2 participants last post by  giuliano  
#1 ·
Good day everyone,

When I originally purchase my bike (brand new) I had to change the jettings on it to make it work properly.

Recently the bike pops after revving it or downshifting. What regulator/screw do I need to play with in the carburator to get rid of that problem?

Thank you
 
#2 ·
How does the spark plug color look?

Is the head pipe turning (more) blue?
 
#4 ·
You just want to verify you aren't running too lean.

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#6 ·
I usually drop the needle jet (reduce air).
You raise the clip to lower the needle.

Go one clip.

#24 on #23

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