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pdbutler@aol.com View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pdbutler@aol.com Quote  Post ReplyReply Direct Link To This Post Topic: Threads
    Posted: 07 Nov 2018 at 17:31
.SIZE=2]I am restoring a 1960 Zigolo110cc. Can anyone help me with what the odd sized threads are, please.

Paul Butler
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 2018 at 17:55
You could buy a thread gauge https://www.amazon.co.uk/Thread-Gauges/b?node=6286355031

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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 2018 at 18:46
A thread guage is really the only way. Large diameter fine threads could be anything. All the standard bolts etc. are most likely to be metric.
Brian.

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ranton_rambler View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ranton_rambler Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 2018 at 19:28
I've had a similar issue with a little Ducati. Prior to introduction of standardised metric threads, Italy had its own series. The most common ones are MA and MB which are the same as current normal (coarse) and fine pitch respectively. The Ducati parts book helpfully lists all the fastener sizes, so I've just ordered a load of MB bits to put mine together.
The only exception is the pillion pegs, which are UNF.
As said, unless the Guzzi book also lists the sizes, a thread gauge is useful. I have also used a vernier caliper to get the diameter and counted 5 or 10 pitches. Harder on internal but you can press a piece of paper against it and work from the impression left on it.
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 2018 at 19:49
Wouldn't mind betting there might be a British cycle thread in there somewhere too. The same as British pipe threads are common all over Europe, but always referred to by their metric equivalent.
Brian.

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George S View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote George S Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 2018 at 20:59
Hi welcome to forum. I am also restoring 1961 110cc Zigolo. Most threads are metric, MA course ( not sure of Italian word starting A) MB fine,(B stands for bene Italian for fine) good many are 11mm. Which threads are you referring to.
Not sure if you have parts list. link to Italian language copy, 2nd from bottom of page.

Do you have English copies of owners and workshop manual. If not I could photocopy mine for you.
good luck with restoration, I have found most spares available from Italian companies.
George
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