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  #21  
Old 21st November 2020
5mel42 5mel42 is offline
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Odd that the noise isn't rhythmic and in time with engine speed, as you mentioned initially.
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Many many years ago I remember starting up a Ducati I had just done a complete ground up rebuild on.
Had a dreadful rattle. Had me stumped for a little while.

Then, I found the loose screw sitting inside the air cleaner. Very thankful it hadn't got sucked into the engine.
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  #23  
Old 21st November 2020
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Quote:
Originally Posted by andy2175m4 View Post
I just now checked the side play of the 4 rockers to their shafts:

front cylinder exhaust rocker arm sideplay = .002"
front cylinder intake rocker arm sideplay = .000"
rear cylinder intake rocker arm sideplay = .000"
rear cylinder exhaust rocker arm sideplay = .0025 - .003"
there is a spring on the left side of the rocker arm that keeps clearances slight.check your spring on the rear exhaust. some people building performance motors remove the spring and replace it with spacers.my rocker boxes are like that.
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  #24  
Old 22nd November 2020
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I would be shocked and stunned if that was a rocker arm problem. Shocked and stunned.
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  #25  
Old 23rd November 2020
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Regarding the mystery engine noise, I finally got the rockers and shafts into the lathe and did some accurate side play measurements with a dial indicator: (front to back)

Disregard previous post showing side play, that was a lazy setup, these are more accurate:

#1=.003"
#2=.002"
#3=.0037"
#4=.0015"

The .0037 play rocker was in the intake rear cylinder, which is where the noise was, I suspect this is the source of the noise, the spec is .002" side play max, so per the spec the rockers should be replaced.

So does that makes sense ? I did not accurately check the rocker side play before yesterday, they feel snug, but the dial indicator tells no tales.......
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Old 23rd November 2020
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have you seen post #23?
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I think what your trying to tell us is not "end play" (which is controlled by springs) but the "fit in shaft" and the book does call for 0.0025 clearance.

Again, I will be shocked and stunned if that is the source of your noise.

The noise is not constant. It comes and goes with change in revs.

That would indicate something running loose that doesn't have pressure on it at times. That's if the noise is in the engine and not something on the bike.

Primary chains do things like that/ Generator gears do things like that. Rockers arms won't unless you have the tappets so loose the push rod is about to fall out.

But look, it's your bike and if you want to re-bush and ream the rocker arm, go for it.

But to get the rocker off the rear head you had to pull the head anyway. So, you have done a lot of work already.

I think you should have done a little more investigation first.

If you have a rocker arm problem a screwdriver on the end of the rocker shaft will tell you for certain. The noise will be deafening at that point.
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Old 23rd November 2020
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thank you.fit in the shaft should be measured.the bore of the rocker shaft bushing and the rocker shaft o.d.will give you the clearance.i looked for a side play spec. in the fsm there is none.springs take up the clearance.
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  #29  
Old 24th November 2020
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I've installed new bushings in rockers that were totally toasted, engine was torn down for smoking low compression excessive oil consumption, engine still ran quietly.
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Old 24th November 2020
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Ok. So engine was not noisy but you rebuilt the top end because the bores were worn.

And during the process you re bushed the rocker arms.

Now the engine has a tinkling noise that sounds more like well, ..... a loose primary chain to me.
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