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Hi Folks, just need some help please.Today I had the following fitted to my M109, scorpion tips exhaust, r+d free flow air intake and a tfi {electrinic jet kit} My bike now backfires a lot while gearing down and sometimes when changing gears, otherwise the bike drives perfectly in mid and top range. Is this normal or does it need more fuel or more air. The tfi has settings where you can make your own adjustments. Thanks Guys.:dontknow:
 
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