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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 12-07-2012, 12:53 PM   #1 (permalink)
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Starter motor blues...

I recently tried to remove my starter motor, in order to get access to the threaded plugs behind it, that were leaking oil.

As some know, it's a tight fit, and, it turns out - for a 2006 T100 - that the exhaust header needs to come off first, and probably the line to the oil cooler. Disproportionate effort for the problem, clearly.

Well, I did neither of those things, but was able to struggle through partial dis-assembly of the starter motor (removal of the 2 long bolts), sufficient to get access to the plugs, which were only finger tight, while lying in a steadily increasing pool of dirty oil.

I Teflon-taped the plugs, replaced them - they don't really tighten up that much, and I feared they may go right through. I then slid back the starter motor housing, and replaced all 4 bolts.

Problem is that now, while I can hear the starter motor running, it is not engaging with the fly wheel. It purrs quietly, but that's it.

Any ideas? Surely I can't have somehow busted the $900 starter motor ...


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Old 12-07-2012, 12:57 PM   #2 (permalink)
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If you mean the two long through bolts on the end, they're there to hold the motor together and are only to be used for total motor dismantling on the bench for overhaul. It's possible that the splined output shaft has lost engagement with the rest of the gear mechanism.
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Old 12-07-2012, 01:18 PM   #3 (permalink)
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Quote:
Originally Posted by Forchetto View Post
...It's possible that the splined output shaft has lost engagement with the rest of the gear mechanism.
Thanks for the reply.

By "rest of the gear mechanism" are you referring to the gear mechanism of the starter motor itself?

Have you come across a diagram of the starter motor in your figurative travels??

regards,

GJ

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Old 12-07-2012, 01:36 PM   #4 (permalink)
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Have you come across a diagram of the starter motor in your figurative travels??
The same motor has been used on all Bonnies since the beginning. It's a Japanese DENSO made under DENSO item number 028200-8040 and sold by Triumph under part number T1310908.

As Denso starters are used on a huge variety of vehicles it's difficult to pinpoint a diagram or repair data by searching. Lots of dismantled starters come up but none like ours...
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Old 12-07-2012, 03:57 PM   #5 (permalink)
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Quote:
Originally Posted by Forchetto View Post
If you mean the two long through bolts on the end, they're there to hold the motor together and are only to be used for total motor dismantling on the bench for overhaul. It's possible that the splined output shaft has lost engagement with the rest of the gear mechanism.
are you sure there are any gears in the starter ? I thought the gear you see on the out side was the end of the starter rotar shaft.Never pulled one apart though so not sure.
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Old 12-07-2012, 04:01 PM   #6 (permalink)
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are you sure there are any gears in the starter ? I thought the gear you see on the out side was the end of the starter rotar shaft.Never pulled one apart though so not sure.
Not sure. A lot of starter motors on Japanese bikes have built-in reduction gears, sort of epicylic gear trains. The Bonnie looks as if it has the required reduction on the external gears of the starter system so the motor could be a direct drive on to them.
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Old 12-07-2012, 08:36 PM   #7 (permalink)
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The Bonnie looks as if it has the required reduction on the external gears of the starter system so the motor could be a direct drive on to them.
... this is what it seemed to me, which was why I was surprised at the notion of a gearbox internal to the starter motor.

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Old 12-08-2012, 11:06 AM   #8 (permalink)
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Not sure. A lot of starter motors on Japanese bikes have built-in reduction gears, sort of epicylic gear trains. The Bonnie looks as if it has the required reduction on the external gears of the starter system so the motor could be a direct drive on to them.
According to my Haynes manual there are no internal gears in the Bonnie starter motor. Seems like a fault has developed with the starter clutch. If the sprags have become misplaced somehow, then the idler gear will turn freely in both directions instead of engaging in one direction.

Last edited by Ripper; 12-08-2012 at 11:15 AM. Reason: added info
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Old 12-08-2012, 11:08 AM   #9 (permalink)
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According to my Haynes manual there are no internal gears in the Bonnie starter motor.
thats what i was thinking.
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Old 12-08-2012, 11:25 AM   #10 (permalink)
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Up-front appologies for making light of your troubles, I couldn't help myself.

Da-dah, da-dah
Press the shiny start button,
Da-dah, da-dah
But the engine don't run
Da-dah, da-dah
Check the circuits and fuses
Da-dah, da-dah
Think my starter motor's done
Da-dah, da-dah
Ask the experts on T-Rat
Da-dah, da-dah
Tryin to get me some clues
Da-dah, da-dah
Now it looks like I'm singin
THE STARTER-MOTOR BLUES

Bet Elmore James could do someting with that (like maybe light a cigar)...
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Last edited by Easy13; 12-08-2012 at 11:28 AM.
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