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Re: 2006 xt225 cylinder [Re: Dancastxt225] #146838 01/10/20 02:41 PM
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Az4x4 Offline
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Judging by the photos replacing the cylinder together with a new piston and rings seems the best course - depending on what the rest of the engine looks like.


The voyage of discovery that truly matters is not in seeking new lands but in seeing with new eyes.
Re: 2006 xt225 cylinder [Re: Dancastxt225] #146844 01/10/20 07:55 PM
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peejman Offline
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That's pretty ugly. I'd see what sort of oversized pistons are available and if they are big enough to clean up the damage.


This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.
Re: 2006 xt225 cylinder [Re: Dancastxt225] #146853 01/11/20 05:19 PM
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Paul49 Offline
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That looks a bugga don't it. Looks like somebody has (badly) honed the barrel with all those scratches in it. Has a circlip caused those gouges or a broken ring?

You said:
"The gouge was about half a cm deep maybe 1 cm I didn’t measure,"

half cm is like 3/16". Did you mean 0.5mm? Like (20thou) 0.020"

Best get it measured properly to see if an overbore will clean it up.

This looks dodgy:
Piston kits for £25 on ebay, I guess they are Chinese, has anybody tried them? I paid that for a set of oem rings.


1958 Ariel 650 FH, 2014 Tiger Sport1050, 1995 XT225 Serow, Tiger 800 XRx.
Re: 2006 xt225 cylinder [Re: Paul49] #146855 01/11/20 06:18 PM
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Az4x4 Offline
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Originally Posted By: Paul49
.....This looks dodgy:
Piston kits for £25 on ebay, I guess they are Chinese, has anybody tried them? I paid that for a set of oem rings..

Trying to clean up that damaged cylinder bore and fit an oversize piston to it would be expensive to say the least, even if it could be done and he uses Chinese parts. It'll be interesting following this project as he decides on his course of action.

My best guess at this point is a replacement cylinder with a new piston and rings. Chinese manufacturers are making engines and transmissions for major bike producers like Yamaha and Honda. So cost wise it seems smart to go with Chinese engine parts from a top line manufacturer.

We'll see soon enough what he decides..


The voyage of discovery that truly matters is not in seeking new lands but in seeing with new eyes.
Re: 2006 xt225 cylinder [Re: Dancastxt225] #146856 01/11/20 08:04 PM
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Paul49 Offline
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Not had an engine re-bored since the early 70's can't remember what it cost then, is it pricey nowadays. I would have thought cheaper than a new barrel. Mebbe Chinese parts/engine is the cheapest way forward.

I was surprised when I stripped my engine to find the bore was fine so I got away with just new rings.

Need to find the cause so it don't happen again.


1958 Ariel 650 FH, 2014 Tiger Sport1050, 1995 XT225 Serow, Tiger 800 XRx.
Re: 2006 xt225 cylinder [Re: Paul49] #146882 01/15/20 08:16 PM
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Az4x4 Offline
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Originally Posted By: Paul49
..Not had an engine re-bored since the early 70's can't remember what it cost then, is it pricey nowadays.....

No idea what re-boring costs anymore. Used to be common back in the day. Some still go that route. Like you though it's been a lot of years since I knew anyone who had an engine re-bored, motorcycle or otherwise. My mechanic uncle, WAY back in the day, re-bored and re-built a lot of old automobile engines, bringing them back to full serviceability. Seems there's less and less call for that as far as most are concerned these days.


The voyage of discovery that truly matters is not in seeking new lands but in seeing with new eyes.
Re: 2006 xt225 cylinder [Re: Dancastxt225] #146928 01/23/20 08:45 PM
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JPouchet Offline
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You may be able to have it rebored.

$100 plus freight
https://precisioncycleinc.com/services/o...-pricing-sheet/

Another option in Wisconsin - they may do the XT225 as well
https://www.usnicom.com/Yamaha/DirtbikeCylinderServices

Finally a low-cost but SLOW method - go talk to a local community college or tech/trade school. I know back in my university days all sorts of project bikes and cars were run through the school''s machine shop. many times the students are required to demonstrate proficiency on various machines and need a suitable project.

You supply the parts, pizza, Coffeys, etc. and you get the job done.

JP


Adding some Adventure to my life. Orange County, CA
'07 XT225
Re: 2006 xt225 cylinder [Re: Dancastxt225] #146932 01/24/20 12:05 PM
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I have had this happen twice. 2005 XT225 with 18K miles, wrist pin worked past circlip and scored bore. Had it re-sleeved, bored and honed to fit OEM piston. Total cost $400 with my labor. 5K miles later same thing! Still in pieces.

Bought 2005 XT #2 in July of 2017 with 13,450 miles. Pulled engine apart this winter to reseal top end and there was still crosshatching in the bore at 30,774 miles. Good to go.

On another forum I was on yesterday, mention was made of two XT225s with “wrist pin problems.” Anyone else here with similar experiences?

OEM standard size and two O.S. piston kits are available for 1st gen XTs. The earlier XTs didn’t have Nikasil-coated bores.

Hope this helps.


Jim
Re: 2006 xt225 cylinder [Re: type918] #146933 01/24/20 12:47 PM
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Paul49 Offline
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Originally Posted By: type918
I have had this happen twice. 2005 XT225 with 18K miles, wrist pin worked past circlip and scored bore. Had it re-sleeved, bored and honed to fit OEM piston. Total cost $400 with my labor. 5K miles later same thing! Still in pieces.


That is strange, I wonder how the pin could get past the circlip? Unless the circlip was the wrong size?


1958 Ariel 650 FH, 2014 Tiger Sport1050, 1995 XT225 Serow, Tiger 800 XRx.
Re: 2006 xt225 cylinder [Re: Dancastxt225] #146934 01/24/20 03:33 PM
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It’s a mystery to me. All OEM parts used. Bent rod possible?


Jim
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