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Yamaha MX & Off-Road Dirt Bikes
Made the WR-250 Timing Change and. . . .
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[QUOTE="BCooper, post: 81798, member: 19466"] Humai, Why can't you just count the timing chain links between the "I" mark on the rear cam sprocket (intake) and the "E" mark on the front cam sprocket (exhaust). If it YZ timed there will be 12 links, and 13 links if it is WR timed. I would bet that Euro models are WR timed because they come with a very restrictive exhaust system that cannot be easily uncorked like the US models. According to Rich, this restrictive exhaust was the reason Yamaha had to change the WRs from the YZ timing. If you want me to post a picture of what it looks like, let me know. Coop [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Made the WR-250 Timing Change and. . . .
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