Keep your rockers square

Ninjinsky · April 5th, 2014, 11:26 AM

Just a word of warning when reassembling valvegear. Make sure all the rockers are nicely hooked over the valve heads with an 'ear' each side. It's hard to see but make the effort.
It is easy to get wrong because if it is off and sitting on the spring plate the clearance is still okay and the bike runs normally.
However a few miles on you get an odd knocking and when you open it up you find the edge of the cam has destroyed the rocker surface, Expensive

Ninja rocker.jpg

alex.s · April 5th, 2014, 11:31 AM

here's a photo of a nice square rocker:

Alex · April 5th, 2014, 11:33 AM

How do I load pictures on to this site?

Ninjinsky · April 5th, 2014, 02:48 PM

Thanks Alex, job done

Guess I'll need an oil and filter change as well to catch that case hardenned swarf

and to the other Alex It has always puzzled me that a pro like Bo Diddley would pose getting ready to strum the wrong side of the bridge

n4mwd · April 6th, 2014, 04:45 AM

That's the first time I've seen that happen before, but I'd say that if that's the only thing that happened then you should consider yourself lucky because usually when there is a rocker failure, it is much more catastrophic than that. See my blog below for more info on what usually happens with rocker failures.

Ninjinsky · April 6th, 2014, 05:43 AM

Yep, I'm lucky, Its only £40 and a week off the road. No broken ears, even after the trauma. I just missed it on reassembly, middle front which is the hardest to see.
As I said the worst of it is that there are no symptoms initially it all seems to run sweet and quiet. So you cane it up to 12k with the grin of a fool on your face little knowing the discrete carnage taking place with every revolution.

As well as oil and filter I am thinking in the circumstances a magnetic drain plug.
http://www.louis-moto.co.uk/index.ph...nr_gr=10002912

Ninjinsky · July 29th, 2014, 03:25 AM

ps Its flushed and running fine and a magnetic plug fitted.

Funny how I only joined in April but I feel like I have been here for years

April 5th, 2014, 11:26 AM	#1
Ninjinsky ninjette.org certified postwhore Name: Paul Location: UK Join Date: Apr 2014 Motorcycle(s): Ninja 250, Yamaha RS200 (classic) Posts: A lot.	Keep your rockers square Just a word of warning when reassembling valvegear. Make sure all the rockers are nicely hooked over the valve heads with an 'ear' each side. It's hard to see but make the effort. It is easy to get wrong because if it is off and sitting on the spring plate the clearance is still okay and the bike runs normally. However a few miles on you get an odd knocking and when you open it up you find the edge of the cam has destroyed the rocker surface, Expensive Ninja rocker.jpg Last futzed with by Ninjinsky; April 5th, 2014 at 01:42 PM.

April 5th, 2014, 11:31 AM	#2
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	here's a photo of a nice square rocker: __________________________________________________
	1 out of 1 members found this post helpful.

April 5th, 2014, 11:33 AM	#3
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	How do I load pictures on to this site? __________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)

April 6th, 2014, 04:45 AM	#5
n4mwd ninjette.org certified postwhore Name: D Location: Palm Beach, FL Join Date: Oct 2010 Motorcycle(s): 2006 Ninja 250R, 2007 EFI Ninja 250R Posts: A lot. Blog Entries: 1	That's the first time I've seen that happen before, but I'd say that if that's the only thing that happened then you should consider yourself lucky because usually when there is a rocker failure, it is much more catastrophic than that. See my blog below for more info on what usually happens with rocker failures. __________________________________________________ My Ninja Blog Proud member of ABATE.My NYC Road Rage documentary - CENSORED!

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April 5th, 2014, 02:48 PM	#4
Ninjinsky ninjette.org certified postwhore Name: Paul Location: UK Join Date: Apr 2014 Motorcycle(s): Ninja 250, Yamaha RS200 (classic) Posts: A lot.	Thanks Alex, job done Guess I'll need an oil and filter change as well to catch that case hardenned swarf and to the other Alex It has always puzzled me that a pro like Bo Diddley would pose getting ready to strum the wrong side of the bridge

April 6th, 2014, 05:43 AM	#6
Ninjinsky ninjette.org certified postwhore Name: Paul Location: UK Join Date: Apr 2014 Motorcycle(s): Ninja 250, Yamaha RS200 (classic) Posts: A lot.	Yep, I'm lucky, Its only £40 and a week off the road. No broken ears, even after the trauma. I just missed it on reassembly, middle front which is the hardest to see. As I said the worst of it is that there are no symptoms initially it all seems to run sweet and quiet. So you cane it up to 12k with the grin of a fool on your face little knowing the discrete carnage taking place with every revolution. As well as oil and filter I am thinking in the circumstances a magnetic drain plug. http://www.louis-moto.co.uk/index.ph...nr_gr=10002912

July 29th, 2014, 03:25 AM	#7
Ninjinsky ninjette.org certified postwhore Name: Paul Location: UK Join Date: Apr 2014 Motorcycle(s): Ninja 250, Yamaha RS200 (classic) Posts: A lot.	ps Its flushed and running fine and a magnetic plug fitted. Funny how I only joined in April but I feel like I have been here for years