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		Triumph Forum: Triumph Rat Motorcycle Forums > Twin Talk > Twins Technical Talk
Raising Compression

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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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03-25-2007, 08:07 PM	#1 (permalink)
Teen Guest Posts: n/a	Has anyone tried increasing the compression ratio by machining the face of the head on a 865 Bonnie or Scrambler??

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03-25-2007, 10:25 PM	#2 (permalink)
sweatmachine Senior Member Site Supporter Legend Favourite Bike: 904cc Bonnie w/magwheels Join Date: Mar 2006 Location: Austin, Texas Posts: 11,815 Other Motorcycle: 2005 Yamaha FZ1	It is possible, but the stock pistons are cast and weak. It is about the same amount of work to install a Wiseco 904cc kit, and you get increased compression and forged pistons. __________________ "If you will it Dude, it is no dream" 904cc Custom Bonnie Cafe Fighter!

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