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Author Topic: cylinder scoring  (Read 2663 times)

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Offline utahriding

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cylinder scoring
« on: October 18, 2009, 02:02:44 PM »
hello everyone  I'm new to this site and i am hoping someone can help.

i have recently finished rebuilding my bike,  upon first start up(ran for about 10min. max) coolant was leaking from head. i pulled the cylinder and noticed some light scoring.  is this normal?


(new rod, piston, rings, cylinder replated)
« Last Edit: October 18, 2009, 05:56:33 PM by utahriding »
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Offline Johnniespeed

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Re: cylinder scoring
« Reply #1 on: October 18, 2009, 02:29:59 PM »
Mine doesnt look like that, so I would say NOT normal. Why did it leak coolant ? Why did it score the walls ?
 John
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Offline utahriding

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Re: cylinder scoring
« Reply #2 on: October 18, 2009, 04:26:22 PM »
cylinder needs resurfacing. thought it was ok since place that plated it didnt say anything or do it, but i guess they only replate.

as for the scoring i dont know what caused it was hoping to get answers here.
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Offline hughes

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Re: cylinder scoring
« Reply #3 on: October 19, 2009, 07:37:21 AM »
I don't know if I would call that scoring. Looks to be very light stratches from dirt/debris. Give us more details about why the engine was rebuilt and what was rebuilt in the engine. I have seen that before and in some causes it's due to the cylinder not being cleaned before install. Once you get a fresh replate cylinder from a vendor always washer the cylinder in warm soapy water and use a brush to brush the cylinder to ensure you get all the grit out of the cross hatch.
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Offline utahriding

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Re: cylinder scoring
« Reply #4 on: October 19, 2009, 09:14:47 AM »
repairs started as oil leak, and grew to full rebuild(all new lower end bearings, crank rebuilt with new wiesco rod, cylinder replated , new wiesco piston. didn't wash cylinder, figured it was ready to go when i got it back.   should it be honed again before reinstalling? should i get new rings? do you think any debris got washed into the lower end , and should it be cleaned out?
« Last Edit: October 19, 2009, 01:36:05 PM by utahriding »
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Offline utahriding

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Re: cylinder scoring
« Reply #5 on: October 21, 2009, 02:41:42 PM »
problem solved. coolant leaking into cylinder washing walls causing dry condition.

cylinder , head resurfaced , cylinder honed , new rings , new gaskets. TIME TO RIDE.

thanks for the help guys.
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Offline kaw rider

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Re: cylinder scoring
« Reply #6 on: October 21, 2009, 02:50:14 PM »
aceton will get most of the dirt out of the replate.
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