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Wayne1960
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#31 PostAuthor: Wayne1960 » Sat Jul 26, 2014 8:56 pm

Hi Oldzed I doubt it as everything was stripped to the bone. It's strange cos I think I know it but can't put my finger on it
Just purchased a 1976 UK Z900 A4 for renovation. Wish me luck.
Bike now finished what a joy!

freddyz1r
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#32 PostAuthor: freddyz1r » Sun Jul 27, 2014 9:50 am

Wayne, why don't you put a picture of the offending item on, someone will identify it :?:

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warren3200gt
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#33 PostAuthor: warren3200gt » Sun Jul 27, 2014 10:21 am

Are you sure it's not a bit of valve? that would account for both symtoms.
No compression because the valve is split/chipped and plug gap closed because its been whacked by the bit of valve jumping around in the bore.
might be unlikely but it's the only thing I can think of that would account for both things with one cause.

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Garn 1
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#34 PostAuthor: Garn 1 » Mon Jul 28, 2014 9:46 pm

This little piece of steel looks as so it has spoilt your otherwise good job!
I suspect it is something that has fallen down an open spark-plug hole... probably an insulator resistor that has fallen in.

The valves need to be removed in that combustion chamber and checked & re-seated.
Care with valve seals when removing.

RegardZ.
Garn (Sydney) Z1, Z1A, Z1B and Z900-A4

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chrisu
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#35 PostAuthor: chrisu » Tue Jul 29, 2014 3:21 pm

Really need some photos

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Pigford
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#36 PostAuthor: Pigford » Tue Jul 29, 2014 3:51 pm

Here you go lads......







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And on the 7th day... Zeds were created!

oldzed
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#37 PostAuthor: oldzed » Tue Jul 29, 2014 5:06 pm

Is it a filling from your tooth?
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A police helicopter

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pertonpc
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#38 PostAuthor: pertonpc » Tue Jul 29, 2014 5:17 pm

Difficult to say from that angle - but how does it compare size wise to the metal end of a spark plug that sticks out of the insulation material in the centre ??
Looks too rounded to be the non insulated tip from a plug.

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GEZ635
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#39 PostAuthor: GEZ635 » Wed Jul 30, 2014 6:14 pm

Did you have your engine vibratory polished by Steve smelt hurst by chance. Looks like a ball bearing . They are known to get stuck in oil ways etc?
Gez

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ADRIAN H
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#40 PostAuthor: ADRIAN H » Wed Jul 30, 2014 6:33 pm

Agreed, it definitely looks like a ball bearing. :cry:
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wilsonsjw11
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#41 PostAuthor: wilsonsjw11 » Thu Jul 31, 2014 4:58 am

GEZ635 wrote:Did you have your engine vibratory polished by Steve smelt hurst by chance. Looks like a ball bearing . They are known to get stuck in oil ways etc?


One thing Steve Smethurst always mentioned when collecting an engine from him was to make sure the oil ways were cleaned through before assembly.
Regards
Steve

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Mowjoe
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#42 PostAuthor: Mowjoe » Thu Jul 31, 2014 6:08 am

Not sure how a ball bearing would get into the combustion chamber from an oil way. Probably that shape from being thrown around inside the chamber. You would have to get the metallurgy tested then find a likely part that matches if it,s come from the engine at all.
Z900-A4 looking like a Z1B!

smilecomms
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Unidentified object

#43 PostAuthor: smilecomms » Tue Oct 28, 2014 11:24 am

Hi. This is an old post, but in case you didn't discover what the object was, it is definitely from the cleaning or vibratory service when you had the cases cleaned, I had exactly the same thing. After I assembled the engine, just before putting the cases together, I saw the same thing just lying in the gearbox! And I thought I had thoroughly cleaned everything! Hope this helps.


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