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02 YZf 250 yamaha

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  #1  
Old 03-31-2015
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Default 02 YZf 250 yamaha

picked up a blown 2002 yamaha 250 YZf last night

I need a cylinder and piston.

gives me something to wrench on this summer. Hopefully it doesnt take whole summer to have it rideable.

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  #2  
Old 03-31-2015
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The blown up thumpers that old are usually money pits. That being said, you can always flip them and get parts cheaply if you have a little patience. Shouldn't be a problem for you 'tall! Take pics of the carnage and rebuild!!!
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  #3  
Old 04-01-2015
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i aquired the top end i needed for $150 and gasket kit for $60

also spent $18 on a manual cause i prefer to know Im doing things correct.

so now itll just be my time re assembling this beast... but yeah if need be a can get my money back easily for what i paid
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Old 04-01-2015
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will take a lot of hours but ill get it assembled at some point this summer



Original engine



valves arent too bad, mostly just covered in carbon... but ill probably get it inspected/decked



used bottom end that i hope to use Crank feels super smooth n tight. current piston was seized so ill have to make sure it wasnt due to oil pump failure.



Used cylinder/piston i just orderded for $150 from a guy that upgraded his to the 290 kit.

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Old 04-02-2015
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Something looks funky on the top of that piston. Don't quote me though. I haven't rebuilt a 4-stroke yet. But that shiny ring around the top makes me question the condition of the machine that it came from?
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Old 04-03-2015
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thats how the 4 strokes looks for valve clearance n function
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