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Message: [QUOTE="sunnyboy, post: 740838, member: 39801"] [b]sunnyboy[/b] STOP--and let me clear this up for you--your bike is a 2-stroke looking at the oil will only tell you what is going on with your trans,you have no valves to bang on your piston.you are right it sounds like you have to much play in the rod this means your crank bearing is bad.the manual will give you the acepttable clearance(side to side)the marks on your piston tell me that somthing has come lose in the bottom end traveled up through the transfer ports banged around on the piston and left through your exhaust port.you did sieze it but it is your crank not the piston.you need to split the cases and check out all the bearings,as this is a 100 i would replace all the bearings conrod piston and so on,these small bore bikes rev like crazy and are hard on bearings bringing the motor back to 0 time is in order. putting it back together and trying it the way it is is a waist of time and money(always use all new gaskets)and you can do more damage that can cost big bucks.also let me add while you have the cases split you want to get a seal kit and replace them all,i also always replace all the bearing crank and trans. thier is nothing like splitting cases and a few mounths later the one bearing you didnt replace goes out and you are back sliting cases again ive had it happen once.i learned.do it right and you will have a great bike that will last a long time :thumb: [/QUOTE]