KX250 2T cylinder glazed, hone or scotch brite?

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8/25/2018 9:48 AM

Was about to put the top end back on my KX250 today but noticed the cylinder is pretty badly glazed. There are zero cross hatch marks.

Reading conflicting stories on whether to diamond hone (using a diamond hone specifically made for plated two stroke cylinders), OR to just use scotch brite. I don't see how scotch bright will put cross hairs in a very hard plated cylinder wall.

Some people say they don't touch a glazed cylinder at all (which seems like a bad idea too).

What's the scoop?

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Ride like a girl!!!
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

8/25/2018 10:00 AM

Usually just spray with WD40 or soapy water then wipe it down in a cross hatch pattern with a scotch brite (green).

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10' 200 XC-w
96' XR600r

8/25/2018 10:32 AM

Good vid from Jeff Slavens, thanks.


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Ride like a girl!!!
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

8/25/2018 11:05 AM

Sounds like it is time to measure the cylinder before you go any further.

Paw Paw

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8/25/2018 12:10 PM

queen of spodes wrote:

Good vid from Jeff Slavens, thanks.


Thats a good video. Thanks!

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8/25/2018 1:01 PM

Paw Paw 271 wrote:

Sounds like it is time to measure the cylinder before you go any further.

Paw Paw

Don't even need to put calipers on it. There is light chipping below the exhaust port and two tiny divits on another the other side of the cylinder.

Hate mailing parts off but it's either that or drop $600 for a new cylinder (and keep this one as a spare)

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Ride like a girl!!!
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

8/25/2018 7:25 PM

You may call millennium technologies, I think they have an exchange program where they send your a new reconditioned cylinder and you send them your shot one as a core.

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10' 200 XC-w
96' XR600r

8/26/2018 4:26 AM

Hi. I see that you have already decided to send it off for a replate. From your written description, I would say that is a good idea. I have a new in the OEM box 2005 KX250 engine. The cylinder walls have strong cross-hatching on them, as seen in the picture below.

This cylinder sounds worn down, but normally, I would try a pair of nitrile gloves, some green Scotch Brite and some light, clear oil. Follow that up with some warm, soapy water and an old toothbrush. Keep hitting it with the often mentioned white rag cleanliness test. After that, hit it with the hair dryer and a light coat of oil.

Photo

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