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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZF267 v. YZF290
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[QUOTE="EricGorr, post: 199181, member: 19611"] New AMA rules regarding the YZ250F Starting in 2003 the maximum displacement of a 4-stroke racing in the 125 class 250cc. But for this year 2mm overbores are allowed for modified amateur classes. For those of you thinking about racing 4-strokes in the open or 250 classes. In 2003 the maximum displacement of a 4-stroke in the 250cc class is 450cc. The minimum displacement for a 4-stroke in the open class is 475cc. :scream: [/QUOTE]
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Forums
Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZF267 v. YZF290
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