look at this blaster

Does not look stock.. I am not good with engines too well only certain ones like the ATC's and the CRs and stuff..
maybe a YZ engine? looks big.. does not look like a stock bottom end..
 
ya looks like a yz490

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That kid did such a hack job, if you pause the video you can see he bashed in the pipe as well as the silencer. The bike sounds like sh*t. I would love to do a 490 swap the right way, those motors are sooooooo ball-z