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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Seized 2002 YZ125
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[QUOTE="rmc_olderthandirt, post: 1158820, member: 68872"] A lot will also depend on the type of cylinder it has and how many times it has been bored out before. The standard remedy for a seizure is to rebuild the top end. Prior to a seizure a top end rebuild is a new ring(s) and some gaskets, probably no more than $50. After a seizure the cylinder usually has to be bored out oversize, which means you need to buy an oversize piston. Bore job can be $50 to $100, piston around $90. Some engines have a plated cylinder, so in addition to boring (or sometimes in place of) you have to have it re-plated. I haven't done this myself so I can't speak from experience, but a quick look tells me it is around $200. The past history of the bike is important because you can only bore the cylinder out a few times before there isn't any more room to bore. At this point you can have a new sleeve inserted (couple hundred $$) or buy another cylinder from someone's part bike. So if the seller tells you that it has never been bored before then it is probably good. If he tells you that it is already at the fourth overbore, the cylinder is toast. As long as the bottom end is okay, and you don't drop any parts down into the crankcase, rebuilding the top end is pretty easy. Take off the tank to get room to work. Remove the radiator hoses, carburetor, top engine mount. 5 nuts hold the cylinder head on. Four nuts hold the cylinder down to the crankcase, remove them and the cylinder should just slide off the top. If the piston is still stuck spray some WD-40 into the cylinder and let it soak for a day or two to get the piston to break loose. Take your cylinder and piston down to the bike shop and ask them: How much? They will either refer you to another bike shop or send the cylinder out to a machine shop to have it bored out. You can bypass the bike shop and go directly to the machine shop if you know of one. It will probably take you a couple of hours to tear the bike down, a week to get the cylinder bored and the parts you need, and then a few hours to put it back together. Oh, before you put it back together, be sure that you check the end gap on the ring(s)! If the gap is too tight you will seize the engine again right away! Rod [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Seized 2002 YZ125
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