So after firing up my rider after winter, Ive noticed it puffs a little smoke here and there. Well it qiut the other day and after pulling the plug I noticed it was fouled. It consumes oil and has 60 psi of compression. I checked the valve leash and the top one had 0 and the bottom like .005". Does it need new rings or the valvesd adjusted? Its on a 15hp vanuard model 28q777.