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Rocker Arm Failure

H

Husadawg

Joined May 2002
133 Posts | 0+
Chandler, Arizona
Hello Everyone, I am an infrequent visitor to the site so I'm not up to speed with the latest. At the end of a 100mi ride saturday, I heard some unusual noise from the top end. I haven't gotten into it yet but suspect I've lost the rocker arm needle bearings again. I changed them about 120 hrs back with the larger (03?) update. My bike is an 00 FE400E. I run mobile 1 pure synthetic exclusively. Other than rocker arm bearings, this bike has been bullet proof. I'm a little surprised and disappointed not to have gotten better life out of the larger bearing mod.

My question is, what is the latest update or recommended part #'s for a rocker arm rebuild and where's the best place to order parts these days?

Thanks in advance for any advice.

Husadawg 8)
 
I would call Dan Blum at Motoxotica. The part number for the 03 style rocker arm cam follower bearing is 200 324-01.

The 03 style Intake cam follower bearing on my 00 501 went 99 hours before it wore enough to require replacement. The Exhaust bearing is still going strong at 127 hours.

I might also point out I had an intake valve spring break at 347 hours.

Regards,

Joe
 
rockers

:D husadawg, these parts are all in stock at huaberg headquarters, ask for BOSS aka ricky. thank you!
 
Thanks for the input and advice Joe & Ricky. I'll get the parts ordered as soon as I confirm that's the problem.

Best Regards,
Husadawg 8)
 
Husadawg said:
what is the latest update or recommended part #'s for a rocker arm rebuild and where's the best place to order parts these days?
Husadawg 8)
Click to expand...

Hi Husadawg,
Said bearing failure is quite common as the OEM camshaft profiles produce excessive valetrain acceleration rates. Based on experience the average life of said components with an OEM cam is that of 60 hours.

You have options regarding camshafts including those from Tornado and myself.

Oil type is yet another issue. My personal choice is that of Chevron DELO 400 albeit that horse has been near beaten to death. :)

Please visit my UHE supplied gallery for more information: Gallery Link

Hope this helps.

Kind Regards,
Dale
 
Thanks Dale. I thought I remembered reading somewhere in the past that with the 03-modifed larger needle bearings, the avg expected life was increased to 200hrs. 60hrs is surprisingly short. I realize this is a racing profile cam and springs and that reduced life is the price one can expect to pay. However, as my racing days are behind me, I had hoped that the lower RPM riding I normally do would extend that life. 60 hrs....ouch!

Does your cam profile or that of Tornado significantly extend valve train life? Is so, at what cost in performance?

Thanks again for the response Dale.

B Rgds,
Husadawg 8)
 
Husadawg said:
...
I thought I remembered reading somewhere in the past that with the 03-modifed larger needle bearings, the avg expected life was increased to 200hrs.
...
Click to expand...

I think they told me 100 hours. The original should be 50 hours.
 
Wtf.. My dealer tels me that my 03+ bearings should be changed at 50 hours.. Do this mean that that is overrated?..(thougt that was short) He also said that the old ones often needed to be changed around 25-30 hours.. I should ad that my bike is runned on road only as sm.. and i run it on Castrol R4 Superbike syntetic.. Changes the oil every 5 hours
 
I gather from the responses, I should count myself as lucky to have gotten 120 hrs out of this set of 03 rockers.

Husadawg 8)
 
Husadawg said:
I gather from the responses, I should count myself as lucky to have gotten 120 hrs out of this set of 03 rockers.

Husadawg 8)
Click to expand...

Lucky indeed! :)

Regarding OEM:
High engine rpm shortens the follower life whereas low rpm encourages cam nose wear.

I cannot speak for Tornado, however, all else remaining equal my personal profiles have proven to enhance valvetrain life some 80 - 100 percent.

The LRX2 provides for a broad power delivery which is very user friendly.
The LRX1 favors high rpm with a reduction in power from that of OEM below 4500 rpm.

Hope this helps.

Sincerely,
Dale
 
JoeUSA said:
I would call Dan Blum at Motoxotica. The part number for the 03 style rocker arm cam follower bearing is 200 324-01.

The 03 style Intake cam follower bearing on my 00 501 went 99 hours before it wore enough to require replacement. The Exhaust bearing is still going strong at 127 hours.

I might also point out I had an intake valve spring break at 347 hours.

Regards,

Joe
Click to expand...

I forgot to mention that I am running a Linewweaver LRX2 cam in both of my Husabergs. The broken valve spring had 272 hours on the OEM cam.

Joe

Joe
 
ROCKERARM

:?: does everyone run hour meter's on there bikes? HEY reliability is in the hunt with proper service no Dought!
 
i hope this is an aside and doesn't change the subject BUT the great book says that we should all be changing valve springs as well.

it's quite specific about it because the rest of the bike bar the rockers seems to go for 100 hours. at 50 hours the crank, rod, valve springs, plug and cap must all be changed on the racers. 100 if you trail them etc.

how many racers swap a plug cap and valve springs at 50 and how many trailers at 100 hours?

i somehow don't think so!

so what's the story behind the springs?

can you use the OEM springs with a LX1 and LX2 cam for a lot longer? forever and ever and ever dale!!!!

is the tuliping due to allowing the valve to crash back to the seat rather than follow the cams profile?

clearly this is only an issue for the racers and those who love the speed and MX gearing etc. i would think.

regards

Taffy
 
Taffy said:
so what's the story behind the springs?

can you use the OEM springs with a LX1 and LX2 cam for a lot longer? forever and ever and ever dale!!!!

is the tuliping due to allowing the valve to crash back to the seat rather than follow the cams profile?
Click to expand...

Hi Taffy,
The late model OEM springs provide very high seat and cam nose pressures.

the Longer duration camshafts in general do not require the high spring rates as those of the Husaberg OEM.

Seat recession is largely due to excessive intake valve closing velocities as a result of the OEM camshaft profile.

Additional note:
The two piece "fusion welded" inlet valve is not of the best material.

Options:
One may use the OEM springs with the X1 / X2 profiles and expect enhanced life, replace the conical springs with that of the early dual spring (requires adapters and machining) or wait until I complete testing of a spring kit I co developed.

Hope this helps.


Sincerely,
Dale












I am currently testing a batch of springs as well.
 

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