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Chrisj CMA
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« on: February 22, 2020, 09:26:47 AM » |
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If rebuilding a Honda motorcycle engine and doing a simple honing and new OEM rings. Do you need to size them (end gap) or is that just for high performance after market rings?
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luftkoph
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« Reply #1 on: February 22, 2020, 02:03:29 PM » |
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If it’s a nikasil cylinder,honing is a no no
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Some day never comes
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Chrisj CMA
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« Reply #2 on: February 22, 2020, 02:05:21 PM » |
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If it’s a nikasil cylinder,honing is a no no
Ok but the question is about sizing OEM rings? |
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da prez
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« Reply #3 on: February 22, 2020, 03:40:01 PM » |
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Will not hurt to check. You know there are never any manufacturing mistakes. Also , no hone.
da prez
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Chrisj CMA
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« Reply #4 on: February 22, 2020, 05:20:14 PM » |
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Will not hurt to check. You know there are never any manufacturing mistakes. Also , no hone.
da prez
My neighbor is working on a 80’s era Honda 650. I suggested he gap the new rings before installing. He says he never does when using OEM parts. He’s already had the cylinders honed so if he shouldn’t have it’s too late |
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« Last Edit: February 22, 2020, 05:22:03 PM by Chrisj CMA »
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h13man
Member
Posts: 1746
To everything there is an exception.
Indiana NW Central Flatlands
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« Reply #5 on: February 27, 2020, 07:15:14 AM » |
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Gap/check them. I used new stock rings and they had to be gapped after hone on a 73' XL250.
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Chrisj CMA
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« Reply #6 on: February 27, 2020, 07:31:29 AM » |
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Gap/check them. I used new stock rings and they had to be gapped after hone on a 73' XL250.
Thank you. I didn’t think I was crazy |
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rug_burn
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« Reply #7 on: February 28, 2020, 03:23:45 PM » |
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Is there some rule of thumb as to how much to gap the rings? Like some percentage of the diameter or circumference?
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...insert hip saying here..
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h13man
Member
Posts: 1746
To everything there is an exception.
Indiana NW Central Flatlands
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« Reply #8 on: February 28, 2020, 05:57:03 PM » |
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That info is in the OEM manuals which is the only source I would use.
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Firefight100
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« Reply #9 on: February 28, 2020, 06:04:18 PM » |
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You should definitely check ring end gap. Don't assume the person packaging the rings cant make a mistake. And there is a formula but best to use mfg specs. Ring gaps specs vary depending on cylinder, piston and ring material. As well as intended use.
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gordonv
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Posts: 5760
VRCC # 31419
Richmond BC
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« Reply #10 on: March 01, 2020, 07:40:23 PM » |
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Will not hurt to check. You know there are never any manufacturing mistakes. Also , no hone.
da prez
My neighbor is working on a 80’s era Honda 650. I suggested he gap the new rings before installing. He says he never does when using OEM parts. He’s already had the cylinders honed so if he shouldn’t have it’s too late OEM or not, I'm sure they weren't made by the OEM, and they should always be checked. But do you need to get them to a specific gape, or just not the ends in contact when compressed? |
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1999 Black with custom paint IS   |
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Chrisj CMA
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« Reply #11 on: March 02, 2020, 06:56:44 AM » |
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Will not hurt to check. You know there are never any manufacturing mistakes. Also , no hone.
da prez
My neighbor is working on a 80’s era Honda 650. I suggested he gap the new rings before installing. He says he never does when using OEM parts. He’s already had the cylinders honed so if he shouldn’t have it’s too late OEM or not, I'm sure they weren't made by the OEM, and they should always be checked. But do you need to get them to a specific gape, or just not the ends in contact when compressed? It’s a specific gap. Too tight and the ring breaks when hot. Too large and you loose more compression. Definitely more critical on the tight end but it’s a fairly scientific process to do it right. |
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