1967 Bonneville Rotor and Stator Questions - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 9 (permalink) Old 05-01-2015, 07:34 PM Thread Starter
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1967 Bonneville Rotor and Stator Questions

Here’s the issue.I am putting something together that "may" once have run...I have replaced just about everything on the left side of the engine...because it was either busted, missing or just wrong...

1) I have the primary drive gear installed and the spacer installed on the face of the gear.
When I slide the rotor so it sits against the spacer…1/4 or more of the rotor actually rubs against the chain.
But this is the spacer! It’s the right “height” and yet if it push the rotor against it and slide it onto the shaft so that the key will fit it definitely looks like it will interfere with the primary chain. Also the woodruff key to hold the rotor in place is ˝ the length of the slot in the rotor. Is this normal?

Photo 1 shows the spacer in place on the gear shaft.
Photo 2 shows the rotor pushed up against the spacer and you can see how it will interfere with the chain.

2) When I test fit the stator on the three studs ..that stator itself doesn’t seem to “seat” properly against any shoulders on the stud. In fact if I push it into place the stator interferes with the primary chain…and it still doesn’t “seat” against anything.

Photo 3 shows the stator just “hanging on the studs” and pressed up against the primary chain.
Photo 4 shows the stator pressed up against the chain …and the third stud is not even able to clear the “body” of the stator.

My belief is that if I screw everything back together the chain will quickly grind its way through the stator if I push the stator up against the chain as a stop. OR if I just align the stator so it clears the chain the stator is simply “floating” on the studs and will move anyway. Finally unless I have the stator and rotor exactly aligned it won’t function properly. i.e…the face of the rotor has to be in line with the face of the stator.


So…dumb questions. What am I doing wrong?
1) Do I have the wrong length of studs in the case? (This is what they came with)
2) Are the studs at the wrong height and they need to be unscrewed so that the stator sits on the “shoulder” of the stud?
3) What is going on with the rotor? Is it actually just held in place by the magnetic field of the stator and the spacer is not something that it needs to be set against?

Any help would be appreciated…

Thanks,

Julien
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post #2 of 9 (permalink) Old 05-01-2015, 09:03 PM
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Hi Julien

your bike is I believe a 67.

You will get more responses if you post in the Classic, Vintage and Veteran part of the forum (this one is for the modern Twins)

Try reposting your questions here: https://www.triumphrat.net/classic-vintage-and-veteran/

you are bound to get a lot of good info there - good luck! (coming from someone who also has wrangled an older Bonnie that like yours looked good on the outside but underneath... )



Aunty Mabel
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post #3 of 9 (permalink) Old 05-01-2015, 09:25 PM
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Moved it for ya!
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post #4 of 9 (permalink) Old 05-01-2015, 09:51 PM
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Why are you using a triplex chain and engine sprocket? They fit OK on a T140, but that uses longer studs and a spacer almost 9/16" thick.

Easiest fix could be to get a duplex engine sprocket and duplex chain. The duplex chain will fit the triplex clutch basket OK, so you won't need to change the basket.
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post #5 of 9 (permalink) Old 05-02-2015, 08:56 AM
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The triplex primary drive explains everything! Get the correct duplex crank sprocket and a duplex chain and it should all work out well.
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post #6 of 9 (permalink) Old 05-02-2015, 01:19 PM Thread Starter
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Thank you so much! If you check my welcome to the club email. My bike was purchased as a present from my wife from a group that shall be unnamed and under the shiny paint was assembled out of every used, incorrect and worn out bit o'junk he had lying around the workshop.
I will order the duplex chain and gear today.
thanks guys!
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post #7 of 9 (permalink) Old 05-02-2015, 02:16 PM
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Good luck with your rebuild. There are a lot of dodgy rebuilds around, looks as if you ended up with one. But any Triumph is a lot better than no Triumph!
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post #8 of 9 (permalink) Old 05-02-2015, 02:29 PM
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As nobody has mentioned it,

The primary drive AND the clutch need to be duplex along with the chain
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post #9 of 9 (permalink) Old 05-02-2015, 05:38 PM
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Quote:
Originally Posted by DAVE M View Post
The primary drive AND the clutch need to be duplex along with the chain
The triplex clutch basket basket works just fine as a replacement for the duplex basket.
The outer row of teeth are unused, and the duplex chain runs on the inner 2 rows of teeth. Everything else on the basket fits the same.
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