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To bore or not to bore (Read 83 times)

verslagen1

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To bore or not to bore
10/20/21 at 16:58:34

That is the question.

I'm rebuilding an engine (not mine) because the piston overheated probably due to lack of oil. It also has cam and rocker damage.

Piston has transferred some material onto the cylinder.
I've honed the hell out of it to clean it up.
The cylinder is now over 84mm by 0.002 to 0.003" (2 in spots/3 in others)
Wear limit is 0.0031"

What would you do?

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TheSneeze Serious Thumper Offline Posts: 1201 Northern Nevada Gender:	Re: To bore or not to bore Reply #1 - 10/20/21 at 17:49:13 Next available size piston and rings. Bore and hone accordingly. My thoughts are it will have blow by sooner than it should being so close to the service limit. My $0.02
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DragBikeMike

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Re: To bore or not to bore
Reply #2 - 10/20/21 at 23:01:14

What kind of hone did you use and were torque plates installed?

I assume "84mm" is a typo and you meant 94mm. Can you provide the actual measurements, right/left, fore/aft (top, mid, bottom). Total of six readings. That way we can see what the taper and out-of-round are.

It might work OK with a forged piston. They need a bit more room.

It really needs to be measured with torque plates installed and properly stressed up.

Knowledge is power.

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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28752 L.A. California Gender:	Re: To bore or not to bore Reply #3 - 10/21/21 at 10:07:10 Yes, 94mm No torque plates el cheapo hone Measured it again, and perhaps the honing process heated it up? At least hotter than the bore gauge. Top to bottom Thrust Transverse .002 .001 .002 .001 .002 .001 Not as bad as yesterday.
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Ruttly Serious Thumper Offline Thumpers Rule Posts: 4997 Manteca , CA Gender:	Re: To bore or not to bore Reply #4 - 10/21/21 at 11:26:50 Run it , change oil around 500 to 600 miles Bore it till you can’t bore no more ! Used cylinders are cheap.
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DragBikeMike

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Re: To bore or not to bore
Reply #5 - 10/22/21 at 01:25:09

So are you saying that your bore is 3.702" to 3.703", no taper, only .001" out-of-round? If yes, then I would run it. It's under the wear limit (3.7039"), straight, and only .001" out of round.

Are you using a dial bore gage? Is that why you aren't providing the actual size?

Have you checked piston clearance yet? Does it exceed .0047"?

If the owner just wants it running again, and is not looking for an overhaul, then it should be good-to-go as long as it doesn't exceed wear limits.

Knowledge is power.

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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28752 L.A. California Gender:	Re: To bore or not to bore Reply #6 - 10/22/21 at 05:52:11 Yup, no taper, .001 out-of-round. Yup, dial bore gage. buying a new piston, old one wrecked. will check.
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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28362 Tucson Az Gender:	Re: To bore or not to bore Reply #7 - 10/23/21 at 08:39:31 Versy is never boring...
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goofin YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 23 harrisburg pa Gender:	Re: To bore or not to bore Reply #8 - 10/23/21 at 13:14:41 sleeve it and forget about it
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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 17784 Camp Springs, Kentucky Gender:	Re: To bore or not to bore Reply #9 - 10/23/21 at 18:37:23 goofin wrote on 10/23/21 at 13:14:41: sleeve it and forget about it ??????????
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