Hi there. I am a new member here. Me and my 15 year old son have built a few go karts and mini bikes thru the last few years. Currently we have a mini bike with a Predator 212 that started to loose power and then shut off. After some investigation we found out that the intake rod is out. Was told to upgrade the valve springs to 22lbs after replacing them we have set the and reset the valve lash to .003 while following all the steps and engine at tdc. After we put her back together the engine will run but bogs out if we try to run it full throttle and same thing happens again. What am I missing here?