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Old January 3rd, 2013, 08:49 PM   #1
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Where to find oversized piston rings?

I remember seeing a thread with a website that listed oversized piston rings but can't seem to find it. Can anyone help?
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Old January 3rd, 2013, 09:50 PM   #2
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This one?

http://www.ninjette.org/forums/showt...light=oversize

Send a PM to Racer_x, he will know.
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Old January 3rd, 2013, 09:54 PM   #3
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hmm, i couldn't find anything with the google search or the traditional searches.
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Old January 3rd, 2013, 10:04 PM   #4
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Are you planning to bore it .020 over?
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Old January 3rd, 2013, 10:33 PM   #5
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Quote:
Originally Posted by Motofool View Post
This one?

http://www.ninjette.org/forums/showt...light=oversize

Send a PM to Racer_x, he will know.
Maybe I mistook seeing oversized rings for big bore pistons. Either way, I'll shoot Eric a PM.
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Old January 4th, 2013, 06:17 AM   #6
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NM, all the overbore kits are 2mm, which is a lot more than an just a rebuild.
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Old January 4th, 2013, 06:33 AM   #7
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First how do you know it's the rings? If the cylinder is just glazed you can hone the cylinder and install new rings. You can get a larger ring and cut your own ring gap if it is that far gone. But the pistons might need to be knerled to stop them from rocking. At that point I would just over bore.
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Old January 4th, 2013, 07:13 AM   #8
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Quote:
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First how do you know it's the rings? If the cylinder is just glazed you can hone the cylinder and install new rings. You can get a larger ring and cut your own ring gap if it is that far gone. But the pistons might need to be knerled to stop them from rocking. At that point I would just over bore.
I did a wet compression test and it brought compression up to 180 from 70-90 psi. Can't tell if cylinders are just glazed or rings stuck without pulling the head.
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Old January 4th, 2013, 08:16 AM   #9
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What happen? I am going to guess valves. But pulling the head is a must at 80 psi anyhow. Get the head off. Pull the cams and check the valves for leakage with liquid poured into the chambers. Or pull the cams ad do a leak down test with the cams out carbs and exhaust off.
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Old January 4th, 2013, 08:45 AM   #10
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What happen? I am going to guess valves. But pulling the head is a must at 80 psi anyhow. Get the head off. Pull the cams and check the valves for leakage with liquid poured into the chambers. Or pull the cams ad do a leak down test with the cams out carbs and exhaust off.
Bike had a hard time starting after each session during a track day. It would take longer and longer each time until finally it wouldn't start.

More here: http://www.ninjette.org/forums/showthread.php?t=120502
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Old January 4th, 2013, 09:49 AM   #11
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did you get your oil analyzed again?


what were the results?
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Old January 4th, 2013, 11:13 AM   #12
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Quote:
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did you get your oil analyzed again?
what were the results?
I have 3 samples I need to send off. I was waiting for them to send me more containers, but I think I'll pick up some stuff here at my lab and use in lieu of theirs.

After the initial analysis, I changed my oil at 2k, and about the interval thereafter.
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Old January 5th, 2013, 12:44 AM   #13
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http://www.jepistons.com/Products/292754.aspx

Looks doable. I'll have to get a quote from my machinist on how much it'll be for a bore and balance. Might as well do a PnP while I'm at it.
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Old January 5th, 2013, 05:43 AM   #14
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Balance is not nessacary. I am spinning the 265 set up to 14000 rpm on nitrous with no problems.
My machenest charged me 100 dollars to do two blocks. He said he should have charged me three hundred but he likes me.
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Old January 5th, 2013, 02:29 PM   #15
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are they the same weight as stock?
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Old January 7th, 2013, 09:16 AM   #16
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Quote:
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are they the same weight as stock?
According to this post: http://www.ninjette.org/forums/showp...84&postcount=5

and JE Piston's : http://www.jepistons.com/Catalogs/Po...inja_250r.aspx

12.5:1 64mm is 148 grams vs 12:1 62mm 140 grams stock.
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Old January 8th, 2013, 08:30 PM   #17
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@Racer x, do you have any experience or knowledge with wiseco pistons? I was searching on ebay and found a seller that sells them for $100 per piston kit. Saves me an extra 100 vs going with JE Pistons.

http://www.ebay.com/itm/Wiseco-Pisto...d48216&vxp=mtr
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Old January 8th, 2013, 08:45 PM   #18
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They have been making pistons for a long time, but I have not used them.
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Old January 8th, 2013, 09:04 PM   #19
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Have not used wiseco on a bike before, but have used them on my eclipse.
In that case, they held up great.
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Old January 9th, 2013, 08:27 AM   #20
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Have not used wiseco on a bike before, but have used them on my eclipse.
In that case, they held up great.
I'll most likely order it if I can rule out stuck piston rings.
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