ignition timing

Turismo, Briscola, Gran Turismo, Super Sport, Tresette, Tresette Sprint, Settebello
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Bob Purton
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Joined: 06 Sep 2020, 00:24

ignition timing

Post by Bob Purton » 06 Sep 2020, 00:28

Hi. Could someone please help me with the correct ignition timing proceedure for the 175 Tourismo. I cant find it anywhere in my records. Degrees before top dead center or measurement etc etc. Thanks in advance.

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350-v-twin
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Re: ignition timing

Post by 350-v-twin » 06 Sep 2020, 10:52

Bob, I have got 2 owner manuals of 2 different 175cc models. As I am the administrator of this forum (and can manage users), I looked up your email address and will send those 2 manuals over.

Hope that helps!

Bob Purton
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Joined: 06 Sep 2020, 00:24

Re: ignition timing

Post by Bob Purton » 06 Sep 2020, 17:12

Thanks but the timing data isnt included in the manuals. There must be a record somewhere of the technical data, what about all the piston ring gap and clearances to bore cleances? I cant see how anyone could rebuilt an engine properly without more data?

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Tintin
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Re: ignition timing

Post by Tintin » 07 Sep 2020, 11:31

page 27 & 29 on this manual gives the data depending on engine type, hope your italian is any good :wink:
https://www.rpw.it/Files/Morini_175eGT_UEM.pdf

this manual on page 20: https://www.rpw.it/Files/Morini_175_UEM.pdf

here are some electrics diagrams: http://www.alzavalvole.it/manuali-moto-d-epoca.html

here you can buy some: http://www.registrostoricomotomorini.it ... italia.htm

If the data is not there you may have to talk to an expert who knows standard tolenrances for (Italian) bikes from that era
"Innamorato di vecchi motocicli Italiani"

Bob Purton
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Joined: 06 Sep 2020, 00:24

Re: ignition timing

Post by Bob Purton » 07 Sep 2020, 20:22

Thanks Tintin. Thankfull Tony found the timing data for me in a GT manual, I had it all along , just couldnt read it!

Here is a question. Is my bike a late Tourimo or an early Tresette?
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350-v-twin
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Re: ignition timing

Post by 350-v-twin » 08 Sep 2020, 09:16

You're welcome!

To me, your bike seems more like a Tresette. To be really sure, you should have a look at the cilinderhead/rocker cover.

Image

I have got an excellent article from the Italian motorcycle magazine "Motociclismo d'Epoca".
It shows the various 175cc models and the differences. The picture above is from that article.

I'll send you the article by e-mail in a .zip file

This is a 100% Tresette, but seems to have a Tresette Sprint toolbox:

Image

Aparantly, this black Tresette a later model with different toolbox and different/longer fuel tank.

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350-v-twin
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Re: ignition timing

Post by 350-v-twin » 08 Sep 2020, 14:20

Here's the answer to the question:

According to the book Sempre pui' Forte, written by Wim Raeymakers, there is an early and a later version of the Tresette:

Image
The early model.

Image
The later model.

These pictures above are factory pictures taken from a very rare CD ROM.

Bob Purton
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Joined: 06 Sep 2020, 00:24

Re: ignition timing

Post by Bob Purton » 13 Sep 2020, 13:55

If anyone else was seaching for the same information about timing its 9 degrees BTDC. Total with auto advance fully open its 40 degrees.

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