Most of us that own these bikes have heard at one point or another that you absolutely have to buy an aftermarket ecu to put any other performance part on it. So far I haven't seen a single person test that theory so I wanted to shed some light on the truth about it. Mine runs perfectly with the stock ecu and the FMF factory 4.1. Need proof? the spark plug shows all you need to know. Thanks for watching!

IG: @trashhousecycles

merchandise: daynajamescustoms.squarespace.com

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