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Crf450x - 490 athena kit

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I dropped my bike into the local dealer last week and supplied them with a new oem 450x piston and some pro x stainless valves. They got the valves done and also replaced the starter motor guts ( eBay - 221245136486 ) which works great!! And a far cheaper alternative to a genuine replacement.

They came to change the piston and long story short it didn't fit because it was too small. I had no idea when I bought it so was a bit shocked.

Is there anyone else out there with experience with one of these? I think it's made the bike more mellow but if anyone has a dyno chart of the comparisons for torque I'd be interested to see it.

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