Zongshen ZS12532 Engine Seized HELP - Page 2

Weldangrind · 09-03-2010, 12:54 PM

Quote:

Originally Posted by Cal25

You have to find out whats wrong before it can be fixed. No compression could be other tings besides rings. hole in the piston could cause it. So could a broken, bent , or stuck valve. Anytime a component breaks, there is a chance that damage will occur to nearby parts as well.

X2.

Loss of compression can also be caused by a burned exhaust valve or an improperly adjusted decompression device. I wouldn't be tearing into the bottom end anytime soon.

jaymcfr · 09-03-2010, 02:32 PM

what do u mean weld and grind?

mizke · 09-03-2010, 02:57 PM

Quote:

Originally Posted by Weldangrind

Quote:

Originally Posted by Cal25

You have to find out whats wrong before it can be fixed. No compression could be other tings besides rings. hole in the piston could cause it. So could a broken, bent , or stuck valve. Anytime a component breaks, there is a chance that damage will occur to nearby parts as well.

X2.

Loss of compression can also be caused by a burned exhaust valve or an improperly adjusted decompression device. I wouldn't be tearing into the bottom end anytime soon.

ok ok guys i said bad rings because that is the most common cause of a no compression, unless what he ment was NO compression what so ever. in that case it would be something else. but i took him saying no compression to mean very low compression, or the compression numbers did not match up

Weldangrind · 09-03-2010, 03:02 PM

Several of the China bike engines are patterned after old Honda XR stuff, and as such there is often an automatic decompression device that makes starting easier. It is identified by a cable that runs from the area just above the kickstart to the top of the cylinder head. If the cable isn't adjusted properly, the exhaust valve will hang open and not allow compression to develop.

A burned exhaust valve will produce the same symptom, but it's less likely on a low mile bike.

mizke · 09-03-2010, 04:07 PM

dont have one of those on mine, but on the head there is a bolt that looks to just be bolted into the head

jaymcfr · 09-09-2010, 02:28 PM

Update -

Mechanic has advised the top part of the engine is a mess. The Piston and the rings, the gasket and a few other things. The suspected cause of the engine seizing was something to do with a tube not carrying the oil to the pistons. He has recommended a full strip down and that it will work out cheaper fitting a new engine rather than doing seperate parts. He said something about needing a gasket kit or something.

Total estimated price is Â£790.

I bought the bike for less than that :(

mizke · 09-09-2010, 02:31 PM

contact gio, you can pick up a 250cc 5spd manual motor for 600

Weldangrind · 09-09-2010, 02:32 PM

Not in the UK, you can't.

jaymcfr · 09-09-2010, 02:33 PM

The engine is Â£600 with Â£40 delivery.
Its then 150 for labour :(

Weldangrind · 09-09-2010, 02:36 PM

Try looking around for a new engine on your own. You could swap the new engine in yourself and save some cash in the process. There must be an importer around that can get that engine for you for less.

mizke · 09-09-2010, 02:46 PM

didnt know he was in the uk..

you cant find a off brand engine, but say you come across a honda, yamaha, suzuki, etc... motor all you would need is the wiring harness and electronics, carb and exhaust.. might be able to find a totaled bike or quad and that would have every single thing you need..

katoranger · 09-09-2010, 03:02 PM

Now may be your chance to upgrade to a 200cc engine.

Sounds like a manufacturers defect to me. You should be able to source an engine far cheaper than quoted. Installation is not too difficult for someone with alittle mechanical ability. Or you could find another bike.

Allen

09-03-2010, 03:02 PM	#19
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Several of the China bike engines are patterned after old Honda XR stuff, and as such there is often an automatic decompression device that makes starting easier. It is identified by a cable that runs from the area just above the kickstart to the top of the cylinder head. If the cable isn't adjusted properly, the exhaust valve will hang open and not allow compression to develop. A burned exhaust valve will produce the same symptom, but it's less likely on a low mile bike. __________________ 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

09-09-2010, 02:32 PM	#23
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Not in the UK, you can't. __________________ 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

09-09-2010, 02:36 PM	#25
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Try looking around for a new engine on your own. You could swap the new engine in yourself and save some cash in the process. There must be an importer around that can get that engine for you for less. __________________ 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

09-03-2010, 02:32 PM	#17
jaymcfr Join Date: Aug 2010 Posts: 16	what do u mean weld and grind?
	0

09-03-2010, 04:07 PM	#20
mizke Join Date: Aug 2010 Location: austin, tx Posts: 1,452	dont have one of those on mine, but on the head there is a bolt that looks to just be bolted into the head
	0

09-09-2010, 02:28 PM	#21
jaymcfr Join Date: Aug 2010 Posts: 16	Update - Mechanic has advised the top part of the engine is a mess. The Piston and the rings, the gasket and a few other things. The suspected cause of the engine seizing was something to do with a tube not carrying the oil to the pistons. He has recommended a full strip down and that it will work out cheaper fitting a new engine rather than doing seperate parts. He said something about needing a gasket kit or something. Total estimated price is Â£790. I bought the bike for less than that :(
	0

09-09-2010, 02:31 PM	#22
mizke Join Date: Aug 2010 Location: austin, tx Posts: 1,452	contact gio, you can pick up a 250cc 5spd manual motor for 600
	0

09-09-2010, 02:33 PM	#24
jaymcfr Join Date: Aug 2010 Posts: 16	The engine is Â£600 with Â£40 delivery. Its then 150 for labour :(
	0

09-09-2010, 02:46 PM	#26
mizke Join Date: Aug 2010 Location: austin, tx Posts: 1,452	didnt know he was in the uk.. you cant find a off brand engine, but say you come across a honda, yamaha, suzuki, etc... motor all you would need is the wiring harness and electronics, carb and exhaust.. might be able to find a totaled bike or quad and that would have every single thing you need..
	0

09-09-2010, 03:02 PM	#27
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	Now may be your chance to upgrade to a 200cc engine. Sounds like a manufacturers defect to me. You should be able to source an engine far cheaper than quoted. Installation is not too difficult for someone with alittle mechanical ability. Or you could find another bike. Allen
	0