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Author Topic: New piston, old cylinder needs bore?  (Read 1243 times)

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Offline xedge4lifex

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New piston, old cylinder needs bore?
« on: October 11, 2012, 09:11:51 AM »
Finally ordered parts for my 1970 ct70 and i got a new piston and rings, old one was fried.
now ive heard that a piston and chamber wear together, and if you are putting in a new piston you NEED to get the cylinder bored, not just honed.
i honed the cylinder and it looks good to me no abnormal wear. is there something im missing? can i just throw the new one in?
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Bonesaw

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Re: New piston, old cylinder needs bore?
« Reply #1 on: October 11, 2012, 10:48:53 AM »
I've never heard that. I know you need to hone and use new rings, though.
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Offline Killer Canary

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Re: New piston, old cylinder needs bore?
« Reply #2 on: October 11, 2012, 12:27:33 PM »
Just measure the bore and ensure that it's within spec. I just rebuilt neighbour's z50; I got gaskets, piston, rings, pins, clips and new cylinder, honed already, for $107 to my door on ebay.
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Offline simon#42

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Re: New piston, old cylinder needs bore?
« Reply #3 on: October 11, 2012, 01:18:52 PM »
as long as the cylinder is within spec there is no reason why you cant just fit a piston , make sure you measure it accurately if its ok just fit a piston .
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Offline xedge4lifex

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Re: New piston, old cylinder needs bore?
« Reply #4 on: October 12, 2012, 05:51:23 AM »
its within spec, the bike has like 400 miles on it... so yeah im just going to make sure the hone looks good and put the piston in. thanks for the feedback
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