Does my cylinder need to be plated?

Braaaphole
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8/21/2016
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Spring, TX US
Braaaphole
03 CR250, I recently bought the bike. Compression was a little low so I bought it with the intention of doing the top end. It had a good bit of blow by on the piston. Cranking it over slowly, I could hear it leaking past when I pulled the reeds out. Just pulled the jug off and found this. There's little to no cross hatching left, but this mark by the exhaust port concerns me.

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Paw Paw
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12/24/2011
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Benton, LA US
Paw Paw 9/6/2016 7:08pm
9/6/2016 7:08pm
Yes, I think the cylinder needs some work. The marks at the exhaust port is caused by the exhaust port bridge needing to be chamfered and relieved. The need for this is shown by the piston depositing material on that part of the cylinder.

Paw Paw
racinstation
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Driggs, ID US
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racinstation 9/7/2016 12:24pm
9/7/2016 12:24pm
Most definitely needs replated. US Chrome, or Millenium Technologies.
Millennium Technologies 9/7/2016 12:46pm
9/7/2016 12:46pm
Yep. That cylinder needs some love.

Give us a call 1-888-779-6885 or shoot Jeff Meyer an email. We will get you sorted!

PS - This would be a great time for a Big Bore Kit!

Big Bore Kit (Part Number HM250-MT-BBK10) Retail Price: $638.25,Our Price $574.95

Big Bore Kit Specs:

Std. Bore Overbore New Displacement Compression Piston Gasket Kit
66.4mm 68.5mm (+2.1mm) 265cc Wiseco W6157

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