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Dirt Bike Brands - Other
Yz490
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[QUOTE="jmics19067, post: 655512, member: 27963"] I have no experience riding either one yet but I have bought a crap load of junk parts to build a big bore yamaha for a project. If you want the 490's displacement all you have to do is just put the 490's jug and piston on the 465 to get a bigger engine 5 speed. the only apparent difference between the two is the cylinder liner< 2 mm difference in bore size> and the four speed transmision. From what I understand<read in old magazine product tests> the 465 is a good engine while the 490 suffers from vibration<slap a bigger heavier piston in> and pinging/jetting problems< it looks like yamaha only cut the head bigger to match the head gasket without reshaping the squish angle for the bigger displacement/different pipe configuration>. Then add a boost bottle to try and clean up any sloppy compromises in design. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Yz490
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