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Bubbacluby
 Post subject: Primary gears
PostPosted: Mon May 11, 2020 6:58 pm 
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1275cc
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Location: Cowra
I have a few primary gears and am unsure if they are 1275 or something else.

How do I determine if a primary gear is 1275 or not apart from physically sticking it on a 1275 crank?
(Are all 1275 primary gears the same... ie mk1 S, mk2 S, 1100S etc)

Brenton

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gtogreen1969
 Post subject: Re: Primary gears
PostPosted: Mon May 11, 2020 7:04 pm 
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1275cc
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Bubbacluby wrote:
I have a few primary gears and am unsure if they are 1275 or something else.

How do I determine if a primary gear is 1275 or not apart from physically sticking it on a 1275 crank?
(Are all 1275 primary gears the same... ie mk1 S, mk2 S, 1100S etc)

Brenton


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timmy201
 Post subject: Re: Primary gears
PostPosted: Mon May 11, 2020 7:37 pm 
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The small bore ones have the same diameter bush in each end.

1275 is bigger on the engine side bearing

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TK
 Post subject: Re: Primary gears
PostPosted: Mon May 11, 2020 7:39 pm 
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1275cc
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Joined: Wed Jan 19, 2005 1:52 pm
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Location: Brisbane
all 1275 crank tails are the same.

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Morris 1100
 Post subject: Re: Primary gears
PostPosted: Mon May 11, 2020 7:44 pm 
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TK wrote:
all 1275 crank tails are the same.

I know of three different 1275 crank tails. :mrgreen: But one of those is RWD.
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Bubbacluby
 Post subject: Re: Primary gears
PostPosted: Mon May 11, 2020 8:00 pm 
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1275cc
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So do small bore and 1275 primary gears have the same number of teeth?

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TK
 Post subject: Re: Primary gears
PostPosted: Mon May 11, 2020 8:02 pm 
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1275cc
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Joined: Wed Jan 19, 2005 1:52 pm
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Location: Brisbane
yes I believe so. 998s machined will fit a 1275

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Bill B
 Post subject: Re: Primary gears
PostPosted: Mon May 11, 2020 8:39 pm 
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1275cc
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Joined: Sat Feb 09, 2013 5:44 pm
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Location: Camden
There might be some information here about 1275/998 primary gears:

viewtopic.php?f=2&t=99457
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Bubbacluby
 Post subject: Re: Primary gears
PostPosted: Mon May 11, 2020 9:11 pm 
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Joined: Sat Apr 14, 2007 8:34 pm
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Location: Cowra
Thankyou people for your replies.

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