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Hey everyone,been dealing with quads since I was a kid,now I have a son who loves my raptor 700 and had gotten him an electric power wheel quad but it didn’t cut it for him.so for his birthday “xmas eve” I picked up a used 2002 quadmaster 50 for 500 bucks. It started and moved but needed work.. got it home drove it for a few feet and it started bogging down and would shut off. so I stripped quad down to the frame cleaned it up as best I could without removing motor from frame. replaced top end new head piston rings etc cheap kit off eBay along with carb that will be here today.the filter that was on carb was degraded and soaked with gas. Also new cylinder doesn’t have vacuum line so how do I block that off without getting new petcock valve? tightened chain. guy said quad doesn’t take oil as it’s a closed case right then I knew the guy knew nothing about the machine. So I changed oil,was black and thick and just nasty like sludge. suspension in rear seems good but the fronts are very stiff,any way to adjust these or should I get a new set? also upon stripping everything down I noticed the exhaust restrictor was gone so without that do I need to update jets in new carb,old carb has original jets?? and also I’m new to cvt tranny so how would I know if it’s bad etc? sorry for all the questions just want to make this thing safe for my 5 year old knucklehead. added some photos of my current progress didn’t take any inbetween cleaning everything though please any info will be appreciated. i haven’t rebuilt a quad since 1999 when I had my blaster and my buddies had other 2 strokes I was the mechanic with no knowledge but always seemed to get things right!! also if you notice the old head looked chipped and damaged and I’m wondering if those chips made it into motor how would I go about finding them?i would think by now they would be chewed up? I did not strain oil that I drained but might do that later when the kids are sleeping and I have time to check it without kiddo seeing!