Gio x31 2010 piston/bore size? - Page 2

gagab1 · 06-27-2013, 02:13 PM

Simple... bogieboy i like the way work on this kind of bike. So i will post detail photo/video of valve saturday.Thank you... all of you are very helpful

bogieboy · 06-27-2013, 03:17 PM

i figure the level of precision used in working on them is only needed to be equal to the precision used in manufacturing them.....LOL

gagab1 · 07-02-2013, 08:50 AM

Hey guys! pics of the engine will be uploaded tonight sorry this weekend my GF was moving so i dont have time to check on the bike.

Hope you have a great 3 days weekend!

gagab1 · 07-02-2013, 10:33 AM

So, i do a lot of research the engine is a CB250
This one!

Weldangrind · 07-02-2013, 12:23 PM

It's probably 223 or 230, but a very good engine. Regular oil changes are very important, since there are no cam bearings, just like a Honda.

gagab1 · 07-02-2013, 02:13 PM

To night i will mesure the piston size... hope the 67mm piston i order will fit.

gagab1 · 07-02-2013, 09:13 PM

This engine will need a lot of cleaning.
this is SN

Weldangrind · 07-03-2013, 10:19 AM

That serial number indicates a 69mm bore, but it could be wrong. Measuring is the best way.

gagab1 · 07-03-2013, 10:28 AM

So is the piston size needs to be the same bore size?

gagab1 · 07-03-2013, 01:44 PM

Pic of the old piston this is horrible.

I can confirm its a 65mm piston...
Did you thnk the 67mm will fit ?? or the sleeve must be bored?

humanbeing · 07-03-2013, 06:01 PM

http://item.taobao.com/item.htm?id=14554046635 is what u need if don't want to pay someone for the re-bore (67mm) done.

Weldangrind · 07-03-2013, 09:54 PM

Ugh. That piston looks nasty!

To respond to your question, the cylinder and piston will be very close to each other (if everything is correct). For example, an XR200 will have a 63.42mm piston and 63.60mm cylinder, if everything is well worn. A new engine is much tighter. If you intend to bore out an engine and use a new piston, usually 0.5mm is removed.

gagab1 · 07-03-2013, 10:34 PM

So waht is the best way? Bored the cylinder to 67mm or buy a new 65mm piston and ring?

This is the piston i ordered.
http://www.motopartscenter.com/pisto...rt-p-1427.html

Weldangrind · 07-04-2013, 01:36 AM

The piston looks awful, but how does the cylinder look? Does it have scratches that you can feel with a fingernail? What is the measurement at the top, middle and bottom? If it is not more than .25mm bigger than the piston, it will work.

If the measurements are ok, you can hone the cylinder with a brake cylinder hone from the auto parts store and install the piston you bought. If the cylinder is no good, just buy a new one that matches the 67mm piston. It will probably be cheaper than paying somebody to bore the existing cylinder.

gagab1 · 07-04-2013, 07:26 AM

Yep... The sleeve as a little chunck of piston at the very bottom point. But it think a can remove it.

And if i buy a new cylinder the one that humanbeing show me will be correct?
Like this one cg250?
http://m.motopartscenter.com/index.p...ke+%26+Go+Kart

07-02-2013, 12:23 PM	#20
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	It's probably 223 or 230, but a very good engine. Regular oil changes are very important, since there are no cam bearings, just like a Honda. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

07-02-2013, 09:13 PM	#22
gagab1 Join Date: Jun 2013 Location: Rivière-du-Loup, Quebec, Canada Posts: 28	This engine will need a lot of cleaning. this is SN Last edited by gagab1; 07-03-2013 at 09:15 AM.
	0

07-03-2013, 10:19 AM	#23
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	That serial number indicates a 69mm bore, but it could be wrong. Measuring is the best way. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

07-03-2013, 09:54 PM	#27
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Ugh. That piston looks nasty! To respond to your question, the cylinder and piston will be very close to each other (if everything is correct). For example, an XR200 will have a 63.42mm piston and 63.60mm cylinder, if everything is well worn. A new engine is much tighter. If you intend to bore out an engine and use a new piston, usually 0.5mm is removed. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

07-04-2013, 01:36 AM	#29
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	The piston looks awful, but how does the cylinder look? Does it have scratches that you can feel with a fingernail? What is the measurement at the top, middle and bottom? If it is not more than .25mm bigger than the piston, it will work. If the measurements are ok, you can hone the cylinder with a brake cylinder hone from the auto parts store and install the piston you bought. If the cylinder is no good, just buy a new one that matches the 67mm piston. It will probably be cheaper than paying somebody to bore the existing cylinder. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

06-27-2013, 02:13 PM	#16
gagab1 Join Date: Jun 2013 Location: Rivière-du-Loup, Quebec, Canada Posts: 28	Simple... bogieboy i like the way work on this kind of bike. So i will post detail photo/video of valve saturday.Thank you... all of you are very helpful
	0

06-27-2013, 03:17 PM	#17
bogieboy Join Date: May 2013 Location: finger lakes NY Posts: 2,045	i figure the level of precision used in working on them is only needed to be equal to the precision used in manufacturing them.....LOL
	0

07-02-2013, 08:50 AM	#18
gagab1 Join Date: Jun 2013 Location: Rivière-du-Loup, Quebec, Canada Posts: 28	Hey guys! pics of the engine will be uploaded tonight sorry this weekend my GF was moving so i dont have time to check on the bike. Hope you have a great 3 days weekend!
	0

07-02-2013, 10:33 AM	#19
gagab1 Join Date: Jun 2013 Location: Rivière-du-Loup, Quebec, Canada Posts: 28	So, i do a lot of research the engine is a CB250 This one!
	0

07-02-2013, 02:13 PM	#21
gagab1 Join Date: Jun 2013 Location: Rivière-du-Loup, Quebec, Canada Posts: 28	To night i will mesure the piston size... hope the 67mm piston i order will fit.
	0

07-03-2013, 10:28 AM	#24
gagab1 Join Date: Jun 2013 Location: Rivière-du-Loup, Quebec, Canada Posts: 28	So is the piston size needs to be the same bore size?
	0

07-03-2013, 01:44 PM	#25
gagab1 Join Date: Jun 2013 Location: Rivière-du-Loup, Quebec, Canada Posts: 28	Pic of the old piston this is horrible. I can confirm its a 65mm piston... Did you thnk the 67mm will fit ?? or the sleeve must be bored?
	0

07-03-2013, 06:01 PM	#26
humanbeing Join Date: Mar 2008 Posts: 2,436	http://item.taobao.com/item.htm?id=14554046635 is what u need if don't want to pay someone for the re-bore (67mm) done.
	0

07-03-2013, 10:34 PM	#28
gagab1 Join Date: Jun 2013 Location: Rivière-du-Loup, Quebec, Canada Posts: 28	So waht is the best way? Bored the cylinder to 67mm or buy a new 65mm piston and ring? This is the piston i ordered. http://www.motopartscenter.com/pisto...rt-p-1427.html
	0

07-04-2013, 07:26 AM	#30
gagab1 Join Date: Jun 2013 Location: Rivière-du-Loup, Quebec, Canada Posts: 28	Yep... The sleeve as a little chunck of piston at the very bottom point. But it think a can remove it. And if i buy a new cylinder the one that humanbeing show me will be correct? Like this one cg250? http://m.motopartscenter.com/index.p...ke+%26+Go+Kart
	0