Savage_Rob
Serious Thumper Alliance Member
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Mechanically Inclined Amateur
Posts: 6972
Texas (Dallas area)
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If you are still using the stock muffler, I'd grab a 150 main jet. That shouldn't affect the backfiring but could give a bit more top end power. If it's too rich, go back to the 147.5. If you go to the K7N filter, you'll definitely want the larger main jet (maybe even a 152.5 but I think the 150 will do it). Remember to start the tuning from scratch when you change the air filter type.
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