First thanks to all as I have been doing alot of post and you guys ar always helpful !
I am still sorting out the 73. As posted before the previous owner had a denco kit he told me 1050 (i'm thinking it is a 1015cc. stock carbs have big 120 mainjets. Engine has super compression in the 150psi range. I checked the shims all are good athough two exhuast are tight and next week shop will re-shim it for me. motor has no smoke ,healthy
Also will be adding smoothbores ,waiting for a new float and some jets.
Anyway. There is a little engine clatter during excelleration..from the top end. cruising speeds motor sounds good. Just a littler clatter when heavy on the throtle.
Some mates tell me the 73 cases/covers are thiner so the motors are noisy?? also been told the 73 is lighter that a z1a or z1b
So shoulod I worry or is a little clatter normal on a built motor?
thanks
gregz
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engine clatter
Moderators: KeithZ1R, chrisu, paul doran, Taffus
engine clatter
Z1
1965 Corvette
1965 Corvette
GregZ,
Clatter......
Not pinking
A tinkling noise when engine under load, bit like marbles rattling 
Clatter could be cam chain tension or top idler wheel worn
The valve clearances will make a bit of a 'ticking' noise....
Cam end float can also sound a bit like this... but cannot be easily cured
If bike runs OK & noise doen't get worse - just check top end afet a few 100 miles & maybe oil for any signs of wear or metal particles....
Remember, a 40 year old design & air cooled engine can be a bit nosiy
Clatter......
Not pinking
A tinkling noise when engine under load, bit like marbles rattling
Clatter could be cam chain tension or top idler wheel worn
The valve clearances will make a bit of a 'ticking' noise....
Cam end float can also sound a bit like this... but cannot be easily cured
If bike runs OK & noise doen't get worse - just check top end afet a few 100 miles & maybe oil for any signs of wear or metal particles....
Remember, a 40 year old design & air cooled engine can be a bit nosiy
And on the 7th day... Zeds were created!
Thats very pretty 
The marble noise is most likely 'pinking' or pre-ignition...
Caused by over advanced timing - try retarding it a few degrees... Should be +40 deg as standard, but try 35degs, if stops, gradually advance until you can get near to 40 as poss... for best performance.
Also check you have the correct adv/ret mechanism... the early ones have a different rating to later models....
A higher grade/octane fuel can eliminate the problem too
If this don't cure it, it could be carbon build up on the pistons or cylinder head
The marble noise is most likely 'pinking' or pre-ignition...
Caused by over advanced timing - try retarding it a few degrees... Should be +40 deg as standard, but try 35degs, if stops, gradually advance until you can get near to 40 as poss... for best performance.
Also check you have the correct adv/ret mechanism... the early ones have a different rating to later models....
A higher grade/octane fuel can eliminate the problem too
If this don't cure it, it could be carbon build up on the pistons or cylinder head
And on the 7th day... Zeds were created!
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