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2011 CRF450R Stalling with Pro Moto Pro Billet Spark Arrestor Cap

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Bike was running great with stock muffler and I sold it to my brother in law. He rides alot of off road and dessert, so he needed a spark arrestor and he installed the Pro Moto Billet Spark Arrestor Cap on the original muffler. Type SA #4PMB. The cap on the original muffler gets replaced with this - like that you can have a spark arrestor on the original muffler. After he installed it, he started having problems with the bike idle and stalling at times. I kind of knew this would happen, but I guess he had to do what he had to do. Do any of you guys use the same product and if so, what did you do? Did you have it remapped and if so, where? Or what else would you recommend?

Thanks.

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