Top End Engine Noise

[Jonesy :-)]

certainly was a drastic noise, and I've certainly never heard anything like it. Your contamination under the shim is a good scenario for uneven shim gap and you could probably imagine the shim flapping around in there coz there was no oil film to stick it down.

[dgp0268]

Took the cams out . Took all buckets out. May of been a slither of steel under a shim, maybe created when a shim may of been not seated properly when engine rotated over and cam clicked shim into position. Not sure.
Thinking the contamination under shim caused noise.
Washed everything up. Measured cam up with a dial gauge indicator, and cam sitting in valve caps secured to equal spacers secured to flat surface( drill press table). Rotated cam and seemed to have no run out.
Swapped bucket from noise end of cam with one from opposite end. Reassembled and reset clearances so there spot on. Noise seems way less and goes away when engine warmed up.
I think there was the valve shim noise from number two exhaust and a piston slap from number one piston. The two sounding simultaneously making it hard to diagnose.
Now I just have the piston slap when cold ? .
Will take another video and post. Maybe noise is still there and I am just in denial.

[Jonesy :-)]

Just to add to what steptoe was saying about sprocket bolts being tight i had one come loose once and the head of the bolt was hitting the cam chain tunnel, youll see if it leaves a mark where its hitting

[steptoe]

take the top off and have a captain cook, easiest way, check your clearances yes,,,, take the plugs out too, will make it easier to turn

you,ll need a good chunk of emery paper to take any of that metal off the shims,,,, they,re made of the same steel as ferarri,s use

but also check the cam caps have the right tension on them,, that is a bloody loud tick,,

while your there check the cam sprocket bolts are tight, thats not the tick but while your there,, just to be sure to be sure as Ev says

[Jonesy :-)]

Do you have access to lathe? Put the cam between centres and check for straightness by  dial indicator.

[excess.11]

Any progress on the engine noise.....i hate being left in suspenders 
Opps.....suspense 

[excess.11]

Another area to check would be the valve seat . As the head was done by other people it would nt hurt to check their work including the seal at the valve and seat by pouring petrol in the inlet and exhaust ports.
That noise also sounds like the valve is hammering a loose seat .
Would it be possible to remove the top cover and with the bike idling....try to determine if the noise is happening on the depression of the valve or the release? Needless to say....don t rev oil all over the place.

[dgp0268]

Uneven shim is a good call, I myself tried to take one down on linisher be for I got new set in mail , dam there hard. Linishing with 240 grit belt on and off for a bit took way more of my fingers than the shim . Was tempted to give the nine inch a run on it..
But I have had a couple of difrent shims in that spot.
I realized whils thinking on it today that I have replaced that shim 3 times, each time needing a slightly thicker shim. Could that be a bent cam straightening with use?

[Eveready1100]

The uneven clearance issue could be caused by the shim being badly machined instead of being replaced. I know it sounds dodgy, but I have heard of some shops doing it to get the clearances correct.

[excess.11]

You could try posting on here for anyone that may have a spare camshaft they can either loan or sell to you to help solve your problem.
There s nothing easier to fault find than to have replacement parts to compare with.

[pgnz]

neat vid,  that's a hard-out clatter alright at higher revs, wicked, got to be the valvetrain surely, about the buckets i've swapped them all over the place,  from memory i got rid of a clack by swapping buckets around(wasn't as hard-out as that clack though)  The cams,  find a proper cam engineering outfit they'll do anything, no prob to weld on extra lift etc... but not even worth it unless real keen.  as for 78' cams nah they've got LESS lift on the EX and same lift as 80' on IN but more duration on both,  they're peaky compared to  80' cams,  80' cams are improved -got better road manners but yeah the 78' cams can howl along..

[dgp0268]

The bent valve was on number 4 exhaust , uneven clearance on 2EX, noise sounds from 1EX.
Yes , I see the uneven gap will be placing uneven pressure. It causes the bucket to rotate at about 40 rpm.
I can only think I have a bent cam, will pull the cams and bucket s and inspect. The cam must be putting pressure on the cam bearing caps if bent? Would need a decent bend to lift a lobe 0.01 mm on one edge? Perhaps I plastic gauge cam caps? .
How to see if cam bent?
I am wanting to replace cams .
Can cams in a XS be ground ?

[excess.11]

The uneveness with the cam lobe and shim would create an off centre pressure point when depressing the valve.....if its not corrected now it will create worse wear as time goes by.....
Is there a chance the bent valve damaged the valve guide?

[dgp0268]

Mixed the buckets up for sure, kept valves in order , and had the head and valves professionaly serviced. But failed to keep buckets in order. Surely the bore the buckets run in is perpendicular to the cam? And hence any bucket in any hole should  maintain a horizontal gap. But could non wear matched buckets and bores create such a noise?  I have cheched that all buckets move freely , and removed each one and checked for score or wear marks.
I will swap the buckets from one side of engine to other and see if noise moves.
Thanks
p.s  Noise does not alter at all with lead of , or even with plug removed.

[excess.11]

Mmmm........the no1 ex does seem like the tapping issue your describing. Is there any chance you have mixed up the cam buckets when reassembling ? From the new information that you say it goes away when warmed up and the slightly out of horizontal gap between the cam shim and lobe.........
Maybe try and recall if there may of been a mix up of parts from one valve setup to the next.
You may just need to changeover buckets due to wear tolerances.
PS.... good vid...certainly helps with description of issue.