Hi guys, I would like to have your thought on my problem. I bough a cr 125 2005 2 weeks ago in running condition to have a fun bike and a spare in case I get trouble with my crf 2012. I immediately changed the piston, all gasket and bearing for new oem parts. Also installed a vforce 3 and a R304 shorty while I was there. Saw somewhere the powervalve 7mm stopper pin mod and decided to give it a try. Once everything back in one piece, I went to the track to get some fun. The bike had absolutely no low end power and poor mid, even for a 125! then I read more on the powervalve mod and figured out it's not helping on 125 after 2002, is that right? My gearing was also way off, it doesn't help either. I rode 45 minutes without issue. Next day, bring back the bike again on the track, still with the stopper pin... 45 minutes later I saw blue smoke coming out of the radiator overflow tube. Shut down the motor as soon as I saw it... There is now fuel in my rad fluid. I checked the spark plug and the tip is brown and the rest black, I don't think I was running lean. The headgasket is shot, could it be related to the powervalve being stuck wide open because of the pin? Would something like this happens if the head bolt were not properly torqued? Is it safe if I get the head milled, new headgasket and remove the damned pin?. Thanks!