2009 All Other Makes All Other Models backfiring

2009 ALL OTHER MAKES ALL OTHER MODELS
22 MILES • 0.6L • 4 CYL • RWD • MANUAL
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CHRGD
  • MEMBER
  • 1 POST
Hi, i am using a 2009 yamaha fz-6r engine with a custom made intake manifold and i am repeated getting sparks/ back fires in my runners..
In accordance to the lean burn mixture i checked the spark plugs, and found it to contain black deposits....!!
any insight on how the two things can happen simultaneously???
Nov 28, 2014 at 9:33 AM
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MHPAUTOS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 31,937 POSTS
Are the plug gaps correct, not running rich, may just be tune related, check through these first.
Nov 29, 2014 at 6:30 PM