big bore kit - Motorcycle-Journal Forums

philman · 01-05-2008, 11:07 PM

am interested in putting big bore kit on my 01 yz 250. anyone tried it is it worth the money.

the_privateer · 01-08-2008, 03:14 AM

You will need porting to at least restore port timing and head mods to get the most out of the big bore, but if done right they are worth it.

KD57 · 01-10-2008, 09:01 AM

The YZ ( even an '01 ) puts out more power than most riders can use. Unless you are an upper Int. or expert rider, on the rev limiter all the time and still needing more, I would leave it stock. Put your money into suspension mods, or use it to just keep the motor fresh. A fresh stock YZ will beat a modded one that has seen some time on it.

01-05-2008, 11:07 PM	#1 (permalink)
philman Newbie Joined: Jan 2008 Posts: 1	big bore kit am interested in putting big bore kit on my 01 yz 250. anyone tried it is it worth the money.

01-10-2008, 09:01 AM	#3 (permalink)
KD57 In The Zone Joined: Oct 2007 Bike: 2008 ZZR600 Location: Under a rock in Texas Posts: 2,578	The YZ ( even an '01 ) puts out more power than most riders can use. Unless you are an upper Int. or expert rider, on the rev limiter all the time and still needing more, I would leave it stock. Put your money into suspension mods, or use it to just keep the motor fresh. A fresh stock YZ will beat a modded one that has seen some time on it. __________________ The "other" ZZR rider.

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01-08-2008, 03:14 AM	#2 (permalink)
the_privateer Clunked into first gear Joined: Jul 2006 Bike: 2000 yz125 race prepped Location: bentonville, arkansas, us Posts: 230	You will need porting to at least restore port timing and head mods to get the most out of the big bore, but if done right they are worth it.

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