Sierra-Striking noise in engine head ?!

azriel · 03-29-2011, 04:48 PM

Hi guys!
Just a quick one...

Its about Zong Sierra 200...OHC,8500 kms,just serviced before few weeks.

Is it normal for these engines to hear sligtly "striking" noise coming from the engine head? It "strikes" faster when rewing it,but i cant hear it anymore above aprox. 2000 rpms or in driving couse the engine is too loud then.Its strikes a little louder when cold,and after warming up it gets more "metal" sound. Yes, i already adjusted the valves and checked them twice,also checked the camchain and cc tensioner...but will check them again in day or two...

So i think its not a valves tick or a camchain slap sound ,its a little "deeper" sound then that. When i pull the clutch in it still "strikes" , so its not a clutch basket. :?

It starts good when cold ,perfect when hot,does not overheat,runs good for a 200cc,is a little bit lean (will try 132.5 mikuni main)...Im out of ideas with this sound?!
Am i concernd about nothing, or...?

Thanks once again Brothers in bikes !!!

Azriel

FastDoc · 03-29-2011, 05:14 PM

I don't know. Can you post a little video/audio?

azriel · 03-29-2011, 06:05 PM

Will record it and upload it tomorow after work.

I need to open an account on Youtube.
Thanks!

FastDoc · 03-29-2011, 06:11 PM

I've been able to post videos on Photobucket, if that's easier.

azriel · 03-29-2011, 06:22 PM

Thanks for the tip Doc!
Its alot easier

Ill record it with cold engine and then with warmed up.
I hope it will be hearable on the record.
Thanks one more time!

FastDoc · 03-29-2011, 06:29 PM

No problem. I bet it's nothing. The most likly things would have been cam chain and excessive valve lash both of which appear to have been ruled out already. I don't think being a little lean would have anything to do with it.

SpudRider · 03-29-2011, 08:31 PM

We eagerly await your video.

It's normal to hear the valves tap. In the United States we have a saying, "slappy valves are happy valves," meaning it is better to adjust the valves too loose, rather than too tight.

The Zong has an automatic cam chain tensioner, and the Zong camshaft chain is well manufactured, and should not be causing problems with your low mileage. My stock camshaft chain was in good shape when I replaced it at 32,000 miles.

Based upon your description, I believe you are hearing the normal sound produced by the camshaft rockers tapping the valves.

Spud

azriel · 03-30-2011, 09:05 AM

Well fellas here it is.
You can hear a little cam chain "sizzle" and the other sound that bothers me..
Everything is actually louder on the video. :?
This is with a cold engine,first starting today...when its warmed up it gets about 30% quieter and a little more mettalic.
I completly turned choke off at 00:38.
What do U guys think?

I converted it from .mov to .avi, but sound remained ok.

Thanks!

Weldangrind · 03-30-2011, 10:12 AM

It might be my laptop speakers, but I don't hear anything unusual. Are you sure that it is coming from the top end? When I'm trying to locate a noise, I put my ear to the handle of a screwdriver and touch the tip of the screwdriver to the engine. As you move the screwdriver around, you'll find the noise.

If the noise is in the top end, you could remove the valve cover to see if everything is ok. Then remove the spark plug and slowly kick the engine over and watch the valves operate. If there is a problem in the top end, you will see it.

FastDoc · 03-30-2011, 11:50 AM

Best I can tell it sounds normal. Check the tightness of the header bolts though. An exhaust leak can mimick valve noise.

Weldangrind · 03-30-2011, 11:56 AM

Excellent thought Doc. To expand, I wonder if a leak at the header midpipe would make a similar noise?

SpudRider · 03-30-2011, 12:59 PM

The engine sounds normal to me; I didn't hear anything terrible. Since you adjusted the valves, and the engine runs great, I don't think you have a problem.

I doubt the exhaust has a loose connection. The Zong exhaust has two pieces; it doesn't have a midpipe. The connection between the exhaust header and the muffler is well sealed, and very robust.

Spud

azriel · 03-30-2011, 01:51 PM

W&G,im pretty sure its the top end,but as you all said it sounds normal,i think its then just my imagination hearing the valves tapping and think its something else...i checked the exhaust-its tight. Ill check everything again in few days,if i dont find anything unusual ill just drive it as it is...let them tapp so they can be happy

Thank you all for fast & helpful answers!!!

Azriel

Wild_Alaskan · 03-30-2011, 02:22 PM

If its valve noise try adjusting the valves while prying up on the rocker arm with a screw driver so the gap is at its biggest when you use the feeler gauges and adjust.

azriel · 03-30-2011, 02:41 PM

Thanks for the tip WA, will try that when i check the valves again.-In a day or two...

I would be happiest just to hear thunders from my exhaust and nothing else...

Gotta find some cheap aftermarket silencers

03-29-2011, 04:48 PM	#1
azriel Join Date: Feb 2011 Location: Croatia Posts: 34	Sierra-Striking noise in engine head ?! Hi guys! Just a quick one... Its about Zong Sierra 200...OHC,8500 kms,just serviced before few weeks. Is it normal for these engines to hear sligtly "striking" noise coming from the engine head? It "strikes" faster when rewing it,but i cant hear it anymore above aprox. 2000 rpms or in driving couse the engine is too loud then.Its strikes a little louder when cold,and after warming up it gets more "metal" sound. Yes, i already adjusted the valves and checked them twice,also checked the camchain and cc tensioner...but will check them again in day or two... So i think its not a valves tick or a camchain slap sound ,its a little "deeper" sound then that. When i pull the clutch in it still "strikes" , so its not a clutch basket. :? It starts good when cold ,perfect when hot,does not overheat,runs good for a 200cc,is a little bit lean (will try 132.5 mikuni main)...Im out of ideas with this sound?! Am i concernd about nothing, or...? Thanks once again Brothers in bikes !!! Azriel
	0

03-29-2011, 05:14 PM	#2
FastDoc Join Date: Mar 2009 Location: Southeastern Washington desert Posts: 14,761	I don't know. Can you post a little video/audio? __________________ Happy to serve.
	0

03-29-2011, 06:11 PM	#4
FastDoc Join Date: Mar 2009 Location: Southeastern Washington desert Posts: 14,761	I've been able to post videos on Photobucket, if that's easier. __________________ Happy to serve.
	0

03-29-2011, 06:29 PM	#6
FastDoc Join Date: Mar 2009 Location: Southeastern Washington desert Posts: 14,761	No problem. I bet it's nothing. The most likly things would have been cam chain and excessive valve lash both of which appear to have been ruled out already. I don't think being a little lean would have anything to do with it. __________________ Happy to serve.
	0

03-29-2011, 08:31 PM	#7
SpudRider Join Date: Jul 2008 Location: Idaho Posts: 25,054	We eagerly await your video. It's normal to hear the valves tap. In the United States we have a saying, "slappy valves are happy valves," meaning it is better to adjust the valves too loose, rather than too tight. The Zong has an automatic cam chain tensioner, and the Zong camshaft chain is well manufactured, and should not be causing problems with your low mileage. My stock camshaft chain was in good shape when I replaced it at 32,000 miles. Based upon your description, I believe you are hearing the normal sound produced by the camshaft rockers tapping the valves. Spud __________________ Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894
	0

03-29-2011, 06:05 PM	#3
azriel Join Date: Feb 2011 Location: Croatia Posts: 34	Will record it and upload it tomorow after work. I need to open an account on Youtube. Thanks!
	0

03-29-2011, 06:22 PM	#5
azriel Join Date: Feb 2011 Location: Croatia Posts: 34	Thanks for the tip Doc! Its alot easier Ill record it with cold engine and then with warmed up. I hope it will be hearable on the record. Thanks one more time!
	0

03-30-2011, 09:05 AM	#8
azriel Join Date: Feb 2011 Location: Croatia Posts: 34	Well fellas here it is. You can hear a little cam chain "sizzle" and the other sound that bothers me.. Everything is actually louder on the video. :? This is with a cold engine,first starting today...when its warmed up it gets about 30% quieter and a little more mettalic. I completly turned choke off at 00:38. What do U guys think? I converted it from .mov to .avi, but sound remained ok. Thanks!
	0

03-30-2011, 10:12 AM	#9
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	It might be my laptop speakers, but I don't hear anything unusual. Are you sure that it is coming from the top end? When I'm trying to locate a noise, I put my ear to the handle of a screwdriver and touch the tip of the screwdriver to the engine. As you move the screwdriver around, you'll find the noise. If the noise is in the top end, you could remove the valve cover to see if everything is ok. Then remove the spark plug and slowly kick the engine over and watch the valves operate. If there is a problem in the top end, you will see it. __________________ 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
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03-30-2011, 11:50 AM	#10
FastDoc Join Date: Mar 2009 Location: Southeastern Washington desert Posts: 14,761	Best I can tell it sounds normal. Check the tightness of the header bolts though. An exhaust leak can mimick valve noise. __________________ Happy to serve.
	0

03-30-2011, 11:56 AM	#11
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Excellent thought Doc. To expand, I wonder if a leak at the header midpipe would make a similar noise? __________________ 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

03-30-2011, 12:59 PM	#12
SpudRider Join Date: Jul 2008 Location: Idaho Posts: 25,054	The engine sounds normal to me; I didn't hear anything terrible. Since you adjusted the valves, and the engine runs great, I don't think you have a problem. I doubt the exhaust has a loose connection. The Zong exhaust has two pieces; it doesn't have a midpipe. The connection between the exhaust header and the muffler is well sealed, and very robust. Spud __________________ Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894
	0

03-30-2011, 01:51 PM	#13
azriel Join Date: Feb 2011 Location: Croatia Posts: 34	W&G,im pretty sure its the top end,but as you all said it sounds normal,i think its then just my imagination hearing the valves tapping and think its something else...i checked the exhaust-its tight. Ill check everything again in few days,if i dont find anything unusual ill just drive it as it is...let them tapp so they can be happy Thank you all for fast & helpful answers!!! Azriel
	0

03-30-2011, 02:22 PM	#14
Wild_Alaskan Join Date: Dec 2009 Location: Alaska Posts: 914	If its valve noise try adjusting the valves while prying up on the rocker arm with a screw driver so the gap is at its biggest when you use the feeler gauges and adjust. __________________ Dune buggy build http://chinariders.net/modules.php?n...wtopic&t=14470 400cc lifan build vid: http://youtu.be/20HoU8OK_Y0 other fun: http://tinyurl.com/wildalaskan
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03-30-2011, 02:41 PM	#15
azriel Join Date: Feb 2011 Location: Croatia Posts: 34	Thanks for the tip WA, will try that when i check the valves again.-In a day or two... I would be happiest just to hear thunders from my exhaust and nothing else... Gotta find some cheap aftermarket silencers
	0