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Everything Dirt Bike
Make / Model Specific
Yamaha
f-up top end install
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<blockquote data-quote="ossagp" data-source="post: 208678" data-attributes="member: 1650"><p>I would take the rings off and see if the piston goes through on its own. if it does I would put the ring in the top of the cylinder and square it up. then I would measure the end gap and work it down the bore, observing as you go to see if the ring ends ever meet.</p><p></p><p>For me the right lube is no lube in most cases for the cylinder. Oil the bearings, but my pistons go in dry, especially if it is an old bore. (If i do use oil, it is either atf or the oil I am going to mix.) I clean the cylinder in hot water and soap regardless of how I am going assemble it. If I decide to oil it, I apply just enough to wet it down and then use a piece of those rolled paper shop towels to remove everything the towel will remove.It works to aid the ring seating. Lots of us are convinced that your cylinder does not need 20-200 times the amount of oil it is ever going to see again just to start up. over oiling contributes to glazing. </p><p></p><p>Anyway, I would check it myself to see if there was something else going on before I took the cylinder back.</p></blockquote><p></p>
[QUOTE="ossagp, post: 208678, member: 1650"] I would take the rings off and see if the piston goes through on its own. if it does I would put the ring in the top of the cylinder and square it up. then I would measure the end gap and work it down the bore, observing as you go to see if the ring ends ever meet. For me the right lube is no lube in most cases for the cylinder. Oil the bearings, but my pistons go in dry, especially if it is an old bore. (If i do use oil, it is either atf or the oil I am going to mix.) I clean the cylinder in hot water and soap regardless of how I am going assemble it. If I decide to oil it, I apply just enough to wet it down and then use a piece of those rolled paper shop towels to remove everything the towel will remove.It works to aid the ring seating. Lots of us are convinced that your cylinder does not need 20-200 times the amount of oil it is ever going to see again just to start up. over oiling contributes to glazing. Anyway, I would check it myself to see if there was something else going on before I took the cylinder back. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
f-up top end install
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