Join Date: Mar 2011
Location: Pure Bred Minnestrohtan
Time to narrow down where it is the loudest. Valve noise could be like that, as could a cam chain guide being worn out or broken. Check compression to check the valves. Both problems can cause loss of power. Might get lucky and just have a bad tensioner as well....could pull that out and check for damage while you're digging around. Be sure to lock it and replace it properly to avoid engine damage. Not sure what the tensioner is on a 250, but most are simple. Unlock, compress, lock, install, unlock. Not doing it right could mess up your chain guides and other things...
"In a world full of hate.....There is nothing left to divide."
T. J. Maiden ca. 1994
What's wrong with you people? The sky is MANY colors throughout the day....not JUST BLUE!