i was having some problems with the sled last year, but never had time to fix it. now that im on winter break from college i got some time to fix this thing. well anyways, the first thing i did was put in some new plugs and ran it around. it was running great then after a few min it started to bog when taking off, it was running total half ass, something was wrong. when i took the plugs out and examined them, one had little metal bb like fragments jammed in there. so im guessing the reason why its been running on 1 cylinder is because the other piston is melted. lol. im a total newbie to workin on these things, but an avid learner. later today i plan on taking the little head off and checking the cylinder to see if its damaged. hopefully all i have to do is get a new piston and the cylinder isnt damaged. in order for the piston to melt it must have went lean or its not getting oil. what are my next steps in fixing this thing?