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there are dyno sheets that show that the z-ring loses power (uses power) however , it will last longer ....
We buy the plain non - oring for the race bike , and simple o-ring on the practice bike
I do not like to "lose" any power!
I prefer to put it all to the ground .
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My son is a proven ATV MX champion rider
2009 Can-AM DS 450 XMX, Fox evol 2 fronts and fox rear, Custom motor by Williams ATV performance, motoworks exhaust , BCS intake..
2008 DS 450 Frame: removed all Rivets, modified front frame pieces,BCS frame support kit, replaced all bolts with metric fasteners,ENGINE: Custom Engine build by Williams ATV Performance, BCS intake,SR4G2,x factor nerfs and heels, PEP custom front and rear,Holz A-arms BRP race pkg
more every week
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