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Yamaha MX & Off-Road Dirt Bikes
FMF Quiet Core effectiveness
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[QUOTE="NCFRC, post: 1213562, member: 79003"] [b]FMF Power core[/b] I put a FMF power core on a 04 crf250x and it was just loud , low end grunt but wouldn't rev out like my modified stock pipe . Put the quiet core insert in ,,,which basically reduces the pipe size from 1.50 i.d. to aprox. 1.30 i.d. It made it a little quieter but no better power , I had lost my screaming top end ! Ok , lets take it back apart again , out came the quiet core and the hoaky spark arrester. I found a piece of pipe , about 3-4 " long that fit real snug into the quiet core insert and had an i.d. of aprox. 1.100 . You gotta try ,,,,,,,,,,,,,,,, Well that helped it considerable , The bike has decent bottom end , good midrange pull and ok top end . Overall an Ok package for trail riding and sounds 100% better than the stock pipe " which has no packing on the walls. The modified stock pipe with a 6" 3/4 id preforated i.d . insert would make it come on like a 2 stroke on top ,, but it would make you wonder when the Ka- boom , it would pull and pull under you let off , what a blast to ride ! but bottom end grunt just wasn't there. A long story for what its worth , I 've never bought an aftermarket pipe or muffler yet that I didn't have to tune to the bike. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
FMF Quiet Core effectiveness
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