Post by arrow on May 27, 2013 20:09:07 GMT 1
Oil pump pulley screw. Best one I have seen so far, received this with a pump from one of the guy's on here recently. This is why Yamaha states that you need to check the oil pump stroke every 2000 miles. More often than not this flat is less than 1/3 of this width, from new there should be nothing.
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