Loose cam chain wear?

cuong-nutz · April 2nd, 2013, 09:34 PM

Anyone have this issue? The chain has worn down the oil galley pickup thinger. This is my 2010 250 with 21k miles. Haven't checked the chain for stretch yet.

Motofool · April 6th, 2013, 07:37 AM

Racer x · April 6th, 2013, 08:17 AM

I looked at a first gen engine I have apart. It has a small scratch.. MY guess is the chain slings out on down shifting. But that tab is there to keep the chain from going to far, looks like it works. no worries, maybe shine it up a little.

cuong-nutz · May 6th, 2013, 10:47 AM

Quote:

Originally Posted by Racer x

I looked at a first gen engine I have apart. It has a small scratch.. MY guess is the chain slings out on down shifting. But that tab is there to keep the chain from going to far, looks like it works. no worries, maybe shine it up a little.

Would I see any issues if I cut that piece away to replace the chain? I'm trying to avoid splitting the case.

alex.s · May 6th, 2013, 11:23 AM

its not from the chain, the case is cast and then machined. those are machine marks. if it was caused by the chain it wouldn't look so clean like it was cut with a real tool. it would simply break that little piece off.

Racer x · May 6th, 2013, 12:39 PM

The mark is from the side of the chain rubbing on the tab. It does not hit it hard.

The tab is there to make sure the cam chain does not jump on the crank gear.
I would not recommend removing it.

lgk · May 6th, 2013, 12:58 PM

i wouldn't remove it....

just split the case, and install a new chain.

Jesse8931 · May 6th, 2013, 01:19 PM

If you need a new chain at 21k you might as well stop riding.

my xl350 had 44k and the chain was replaced but it wasnt super bad.

mgentz · May 6th, 2013, 01:21 PM

Your chain most likely did this when u did not install the guide. There are no machining marks. Mine was spotless.

alex.s · May 6th, 2013, 02:55 PM

Quote:

Originally Posted by Jesse8931

If you need a new chain at 21k you might as well stop riding.

could you explain your reasoning

Jesse8931 · May 6th, 2013, 03:10 PM

Quote:

Originally Posted by alex.s

could you explain your reasoning

lets see the chain should last atleast 50k unless you are revving the piss out of the bike all the time.

alex.s · May 6th, 2013, 03:12 PM

Quote:

Originally Posted by Jesse8931

lets see the chain should last atleast 50k unless you are revving the piss out of the bike all the time.

lots of things *should* do a lot of things. are you saying running at high revs damages the cam chain? you are being extremely vague here. "ur bike broke, quit life bro"

Jesse8931 · May 6th, 2013, 03:28 PM

Quote:

Originally Posted by alex.s

lots of things *should* do a lot of things. are you saying running at high revs damages the cam chain? you are being extremely vague here. "ur bike broke, quit life bro"

Yes high rev's all the time will stretch the chain over time.

If it where me I would pull the cct and make sure it is working as it should.

On my cb750 I replaced the cam chain with 40k on it rode the bike for about 5k and had a stretched chain again. So I thought let me replace the cct while i'm at it rode another 15k and sold the bike.

Racer x · May 6th, 2013, 03:33 PM

I just looked at my 2008 engine. I definitly rev the piss out of it all the time. Really.
I never ride on the street and I race it any chance I get. The 2008 engine has a tiny little mark. My 2009 engine gets the same treatment. No mark. But I have had a mechanical cam chain tensioner on that engine since it had 21 miles on it.

Most of the first gen engines I have are over 40000 miles. They all show a little mark.

I would say the when decelerating the chain slings around some . And with the stock cam chain tensioner there is play in the chain sometimes.

I would just split the case. It's not hard to do. And if you replace the chain replace the tensioner. Maybe look into the mechanical type.

alex.s · May 6th, 2013, 04:36 PM

Quote:

Originally Posted by Jesse8931

I replaced the cam chain ... rode the bike for about 5k and had a stretched chain again.

how come you didn't stop riding?

cuong-nutz · May 6th, 2013, 05:43 PM

Quote:

Originally Posted by Racer x

The mark is from the side of the chain rubbing on the tab. It does not hit it hard.

The tab is there to make sure the cam chain does not jump on the crank gear.
I would not recommend removing it.

Good to know. I'll switch to motor B for the time being and just put up this motor up until I can get around to splitting the case and examine everything.

Quote:

Originally Posted by mgentz

Your chain most likely did this when u did not install the guide. There are no machining marks. Mine was spotless.

This was prior to me forgetting the exhaust cam chain guide.

April 2nd, 2013, 09:34 PM	#1
cuong-nutz RIP Alex Name: Cuong Location: Houston, TX Join Date: Apr 2011 Motorcycle(s): '10 250r, '09 265r Posts: A lot. Blog Entries: 2	Loose cam chain wear? Anyone have this issue? The chain has worn down the oil galley pickup thinger. This is my 2010 250 with 21k miles. Haven't checked the chain for stretch yet. __________________________________________________ HalfFast Racing Team Serving Greater Houston Area Riders:WFO Riders MotoHouston HPC CMRA Ride Smart Fastline Lone Star Track Days

April 6th, 2013, 07:37 AM	#2
Motofool Daily Ninjette rider Name: Hernan Location: Florida Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot. MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16	__________________________________________________ *Motofool* *.................................Never ride faster than your guardian angel can fly* "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí

May 6th, 2013, 11:23 AM	#5
alex.s wat Name: wat Location: tustin/long beach Join Date: Sep 2009 Motorcycle(s): wat Posts: Too much. Blog Entries: 5 MOTM - Oct '12, Feb '14	its not from the chain, the case is cast and then machined. those are machine marks. if it was caused by the chain it wouldn't look so clean like it was cut with a real tool. it would simply break that little piece off. __________________________________________________

May 6th, 2013, 12:39 PM	#6
Racer x ninjette.org certified postwhore Name: Eric Location: Iowa City Join Date: May 2009 Motorcycle(s): 2008 Kawmeracchi 350 2010 Project X Posts: A lot. Blog Entries: 54 MOTM - Sep '18, Feb '16	The mark is from the side of the chain rubbing on the tab. It does not hit it hard. The tab is there to make sure the cam chain does not jump on the crank gear. I would not recommend removing it. __________________________________________________ Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja

May 6th, 2013, 12:58 PM	#7
lgk ninjette.org certified postwhore Name: Jason Location: Norfolk, VA Join Date: Dec 2011 Motorcycle(s): 2012 EX250, 2014 EX300 Posts: A lot.	i wouldn't remove it.... just split the case, and install a new chain. __________________________________________________ Ethioknight Memorial Fund- Sticker sale http://www.ninjette.org/forums/showthread.php?t=111700

May 6th, 2013, 01:19 PM	#8
Jesse8931 ninjette.org guru Name: Jesse Location: Ann arbor mi Join Date: Mar 2011 Motorcycle(s): 2007 ninja 250r Posts: 374	If you need a new chain at 21k you might as well stop riding. my xl350 had 44k and the chain was replaced but it wasnt super bad.
	0 out of 2 members found this post helpful.

May 6th, 2013, 01:21 PM	#9
mgentz Board Member Name: ... Location: WI Join Date: Dec 2011 Motorcycle(s): 250R (street), 250R (dirt) Posts: A lot.	Your chain most likely did this when u did not install the guide. There are no machining marks. Mine was spotless.

May 6th, 2013, 03:33 PM	#14
Racer x ninjette.org certified postwhore Name: Eric Location: Iowa City Join Date: May 2009 Motorcycle(s): 2008 Kawmeracchi 350 2010 Project X Posts: A lot. Blog Entries: 54 MOTM - Sep '18, Feb '16	I just looked at my 2008 engine. I definitly rev the piss out of it all the time. Really. I never ride on the street and I race it any chance I get. The 2008 engine has a tiny little mark. My 2009 engine gets the same treatment. No mark. But I have had a mechanical cam chain tensioner on that engine since it had 21 miles on it. Most of the first gen engines I have are over 40000 miles. They all show a little mark. I would say the when decelerating the chain slings around some . And with the stock cam chain tensioner there is play in the chain sometimes. I would just split the case. It's not hard to do. And if you replace the chain replace the tensioner. Maybe look into the mechanical type. __________________________________________________ Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja
	1 out of 1 members found this post helpful.

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