I recently bought a 212cc predator engine and it ran great for a while. I replaced the valve springs with stronger ones and the engine never ran right, so I put the old ones back in an the engine still looses power. I think it's because the springs aren't adjusted right. I looked in the manuel and calibrated the spring to the suggested tension but I still moves super slow. My brother said the problem might be because of the worn out clutch, but I'm not sure. Does anybody know a somewhat cheap solution.