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Hinckley Classic Triples 885cc Classic Styled T3's: Legend, Thunderbird, Thunderbird Sport & Adventurer.

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Old 11-14-2012, 06:54 PM   #1 (permalink)
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Thunderbird Sport not starting in the cold?

I just learned something new about my TBS that I thought I would share. I've always thought it was pretty bad at starting in cold weather. I always opened the choke fully and pressed the starter. But, I have just found out that it starts much better if you don't open the choke all the way. Hope it helps if you have the same problem.
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Old 11-14-2012, 11:26 PM   #2 (permalink)
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Choke (Enricher)

Ditto, never use mine for starting, but for a high idle when 'getting dressed' for the ride, invaluable!
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Old 11-15-2012, 09:42 AM   #3 (permalink)
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UMMM.....
Just to clarify when you apply the choke you are closing it not opening it.

When I'm starting my TBS in cold temps I put the choke at full and start cranking then immediately start opening it a little as I continue.
The engine starts within just a couple revolutions and I adjust the choke to keep it running at just above 1000rpm to warm it up.


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Old 11-15-2012, 12:25 PM   #4 (permalink)
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UMMM.....
Just to clarify when you apply the choke you are closing it not opening it.
Actually, these carbs don't have a choke, per se. They have a cold enrichment valve which adds fuel for a richer mixture and a little air for a faster idle. Turning the "choke" "on" opens the valve.
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Old 11-19-2012, 08:09 AM   #5 (permalink)
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WSC is correct, it is simply an en-richer circuit. My TBS starts perfectly using the full en-richer to start, then I back if off to the point of a slightly elevated idle speed for a few minutes as I ride off.

If your's doesn't start correctly using full en-richer, and in fact starts better when you only use part of it's enrichment, it would seem that either your low speed jet is too large, or your idle mixture screws are set way too rich, or a combination of both??
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Old 11-19-2012, 09:43 AM   #6 (permalink)
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Originally Posted by WSC View Post
Actually, these carbs don't have a choke, per se. They have a cold enrichment valve which adds fuel for a richer mixture and a little air for a faster idle. Turning the "choke" "on" opens the valve.
Really...
I guess I learned something today...

I'll have to take a closer look at my carbs next time I have them off.

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Old 11-19-2012, 04:09 PM   #7 (permalink)
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My TBS starts perfectly using the full en-richer to start, then I back if off to the point of a slightly elevated idle speed for a few minutes as I ride off.
Same here..
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Old 11-19-2012, 09:21 PM   #8 (permalink)
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I'll have to take a closer look at my carbs next time I have them off.
No disassembly required. Just look to see what moves when you move the "choke" lever.
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Old 11-19-2012, 11:23 PM   #9 (permalink)
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hmm...
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Old 11-19-2012, 11:26 PM   #10 (permalink)
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I seen bonnevilles that are fuel injected yet have a choke. do they mechanically do anything at all, or do they simply open and close contacts?
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