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09-17-2011, 11:28 PM
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Senior Member
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Join Date: Aug 2010
Location: JAMESTOWN ND
Posts: 114
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Thinking about a new high compression piston
I was thinking a new piston and was wondering if the motor has to come out, or can it be left in quad? or maybe it dont matter. please reply if you have done this!!! thanks!
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09-17-2011, 11:33 PM
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Super Moderator
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Join Date: Feb 2009
Location: so cal
Posts: 4,545
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It can stay in....just remove tank, frame rails and the head
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09-18-2011, 09:01 PM
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Join Date: Dec 2009
Location: Tampa FL
Posts: 749
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TAKE THE MOTOR OUT ! GREASE THE PIVOT AND MOUNT BOLTS ! EVERY TIME !
ours comes out every 15-20 hours !
Avoid the case issues at t the swing arm , a little Anti-Sieze goes a long way !
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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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09-18-2011, 11:30 PM
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Join Date: Aug 2010
Location: JAMESTOWN ND
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pivot bolts on swing arm and motor mount bolts on engine? about how long to remove motor? thanks!
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09-19-2011, 12:40 PM
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Join Date: Jul 2009
Location: york pa
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if your good 2hrs if not all night lol
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11-07-2011, 12:37 PM
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Member
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Join Date: Jan 2011
Location: NW Indiana
Posts: 32
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If you go with a new higher compression piston shouldnt you have the cylinder re honed? And also can you just stick with the pink wire mod?
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11-07-2011, 01:06 PM
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Quote: Originally Posted by packerfan
If you go with a new higher compression piston shouldnt you have the cylinder re honed? And also can you just stick with the pink wire mod?
no...hi comp piston needs a fmi
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11-07-2011, 06:26 PM
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Join Date: Jul 2009
Location: york pa
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You really should have the cylinder replated for a better seal
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11-07-2011, 06:33 PM
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Join Date: Apr 2010
Location: Elko, Nevada
Posts: 811
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Quote: Originally Posted by hcomras
no...hi comp piston needs a fmi
i have a hi comp piston and i don't have a fmi. rossier told me i don't need one. so its optional
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11-07-2011, 07:59 PM
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Join Date: Feb 2009
Location: so cal
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Whaaaat? You don't have a pc3/5? Eeek id be afraid to see the afr and how lean u were...
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