I have a 2013, 250r. Alright so I just re shimmed my valves at 245 hours. The exhausts were .013 spec is .011 the intakes I couldn't get a .0005 in. So I assumed they are down at 0. Never been shimmed ever. I have done 2 top ends on it, besides that nothing else. I shimmed the intakes to .006. I rode it for 2h, then I had a 2h hare scramble that I raced in. Came back checked the valves and they are out. The intakes exhausts are perfect. The right is down to .003 and the left is .0025. What should I do? Re shim again. Or rebuild the head. If I rebuild the head should I put oem valves and springs in or should I get the kibble whites valves and springs? Is it really worth the money for the kibble whites? And when I do the head should I do the top end too? Thanks for the help.