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Cobra Fi2000R Fuel Controller

I bought your cobra pipes and installed then on my 2006 suzuki boulvard c50t and seem to run ok but after a week or so I took my finger and ran it on the inside of the pipes and really black my friend said it running really rich/lean and could cause it to foul the plugs if it hasn't already done so. it pops sometimes when I back off the throttle it seems to have pretty good power.

By Mike

the bike is getting less then 30 miles to the gallon and he said it should be 40 to 50 miles to the gallon. I seen in one of your answers it would decrease fuel mileage if added. will this part help or hurt the performance also do you think I should add 2 new sparks plugs if I get this part? this is a new bike to me and not sure how good it was on gas mileage before I bought it.