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1965 Honda CP77 — Ulsan Metro City, Rep. Korea
Restored with original parts — Owner: J. Doe

cb77 Piston stress cracks

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lhz55
honda305.com Member
Posts: 29
Joined: Thu May 22, 2008 9:58 am
Location: Myrtle Beach, SC

cb77 Piston stress cracks

Post by lhz55 » Thu Jun 26, 2008 10:06 pm

Do I have to replace the piston? I have discovered hairline stress cracks in the piston where the pin slides in. Only the inside of the channel closest to the hollow center of the piston, shows the cracks. The pin feels fine when slipped in. The cracks are barely visible. This is a disapointment as all my parts have come in and I'm ready to start reassembly.
Thanks, Lee
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LOUD MOUSE
honda305.com Member
Posts: 7818
Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Re: cb77 Piston stress cracks

Post by LOUD MOUSE » Fri Jun 27, 2008 8:32 am

Hello Lee. Are you sure you aren't actually looking at casting webs?. ...............lm

lhz55 wrote:Do I have to replace the piston? I have discovered hairline stress cracks in the piston where the pin slides in. Only the inside of the channel closest to the hollow center of the piston, shows the cracks. The pin feels fine when slipped in. The cracks are barely visible. This is a disapointment as all my parts have come in and I'm ready to start reassembly.
Thanks, Lee
RIDE IT DON'T HIDE IT!
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lhz55
honda305.com Member
Posts: 29
Joined: Thu May 22, 2008 9:58 am
Location: Myrtle Beach, SC

Post by lhz55 » Sat Jun 28, 2008 8:01 pm

Thanks for the responce. No, I'm sure they are hairline cracks. Also they are located at the TDC of the pin channel. They extend about 1/3 of the way into the channel from hollow center. I assume
it would be foolish to try and run it the way it is.
Thanks, Lee
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