Valve adjust

richard-7 said:
Pull your valve cover and inspect your rockers. You'll know right away if one is seized from blockage. I wonder how many have been caught when you torque your head and check valves at 1,000 miles??? Maybe none. Maybe loads have been caught from Factory????
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Lets not beat around the bush here.
So, are we saying that seized rockers on some 961's appears to be caused by:

1. The passages supplying oil to the rocker shafts are too small?
2. The passages supplying oil to the rocker shafts are getting plugged by debris, silt?
2. The design of hydraulic lifters pushing oil up the pushrod to the rocker is inherently faulty or problematic?
3. Some other design flaw in the head?
 
BritTwit said:
Lets not beat around the bush here.
So, are we saying that seized rockers on some 961's appears to be caused by:

1. The passages supplying oil to the rocker shafts are too small?
2. The passages supplying oil to the rocker shafts are getting plugged by debris, silt?
2. The design of hydraulic lifters pushing oil up the pushrod to the rocker is inherently faulty or problematic?
3. Some other design flaw in the head?
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Either by engineering or possibly the company making the components. But the undercut in the adjustment screw is wrong. The adjustment according to the manual creates a situation where the oil can not pass enough oil or any oil at all.


This is a known problem and If you follow my manuals for adjusting valves at 1,000 miles you’ll be okay. We’ve known about rockers for some time. But this valve guide issue is a new one. And I am confident it is unrelated to the rocker issue
 
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Thanks Richard. Would you mind showing the 1000 mile correction for adjustment here, then we have it to hand?
 
jan nelder said:
Thanks Richard. Would you mind showing the 1000 mile correction for adjustment here, then we have it to hand?
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It would be difficult to put into a few words. Best to just reference the manual. You’re going to need it when you do the 1,000 mile service. Unless you trust the dealer has the correct version of the OEM workshop manual.
 
Since Raphi is the 961 heavy weight mileage champ, I would like to know if he has experienced either the valve guide or seized rocker issue, or both.
 
Hi Richard,
Oops didn’t know this had to be done.
I’ve had mine since 2016 just clicked over 7000 miles. When bought bike had 1000 miles. Did the head torque but didn’t see any marks on rocker arms etc. I thought the tappets never needed adjusting but now find out the rocker arms need adjusting every two years. That’s fine as I can do but why? What’s the downside if not done? Excess wear, top end noise. It would seem to me that by rotating the engine so valve spring is fully compressed you’ve got zero gap at valve spring and zero gap at push rod and the adjustment bolts are on the top of the push rods so that by loosening them your just releasing tension on valve spring.
I must be missing something or having a real senior moment.
Simon
 
In the last month we found three worn. Oliver in Germany has found quite a bit. Oliver has a fix that he tells me will last much longer than original.
 
richard-7 said:
It would be difficult to put into a few words. Best to just reference the manual. You’re going to need it when you do the 1,000 mile service. Unless you trust the dealer has the correct version of the OEM workshop manual.
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I have just downloaded a version sent by John O Hara. How do I know which version this is?
 
jan nelder said:
I have just downloaded a version sent by John O Hara. How do I know which version this is?
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Send me your email address and I’ll send you my one07 manuals. The OEM Norton euro4 will be the latest rev. Or what ever rob J sent anyone not euro4 i would trust.
 
This could explain why I had a louder knocking noise around the left side of tappet cover after a ride, shut it off and when I restarted it a hour later it was fine .
Coming up 25,000 km oil change , might pull the tappet cover and check.
I had previously adjusted rockers to Richards specs at around 8000 km .
cheers
Paul
 
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