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1275 Crank


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#1 Chris.Williams

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Posted 15 August 2019 - 10:19 AM

Hi all,
Could someone, much smarter than I, please tell me why I have a 12g1505a crank that has no step on the nose.
What I’m meaning is the primary gear from a small bore fits on.
Am I missing something? Is this a mod that was done back in the day?
Cheers in advance
Chris
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#2 Moke Spider

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Posted 15 August 2019 - 10:24 AM

When that part of the crank becomes damaged - probably from a very early type of Primary Gear - it's common to grind them back and fit a small bore Primary Gear.

 

Nothing in the world wrong with it, in fact, it's a blessing as there's still a few NOS Small Bore Primary Gears available, that have the decent Deva Bushes in them.



#3 Chris.Williams

Chris.Williams

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Posted 15 August 2019 - 10:45 AM

When that part of the crank becomes damaged - probably from a very early type of Primary Gear - it's common to grind them back and fit a small bore Primary Gear.

Nothing in the world wrong with it, in fact, it's a blessing as there's still a few NOS Small Bore Primary Gears available, that have the decent Deva Bushes in them.

Well that’s good news, I have 6 cranks laying about the place and this one is the only one like it, did my head in for a bit.
The rest of the crank appears to have had some balance adjustments.

#4 imack

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Posted 15 August 2019 - 05:34 PM

I've got an A+ one like that, came in an early a+ I bought to rebuild. Massive disappointment when I removed the primary gear.

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