Thunderbird Sport not starting in the cold? - Page 2 - Triumph Forum: Triumph Rat Motorcycle Forums
Hinckley Classic Triples 885cc Classic Styled T3's: Legend, Thunderbird, Thunderbird Sport & Adventurer.

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post #11 of 16 (permalink) Old 11-20-2012, 02:32 AM
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Cold Start

Quote:
Originally Posted by Cyclepath View Post
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??
Running 40 on pilots
120 on mains
Factory Pro Needle on 3rd setting
Idle screws @ 2.5 turns out.
Float levels @ 17 mm

90% of cold starts need no assistance, the other 10% when bike left out in frost (or snow) generally overnight. This is not a fault, in fact it is great, good for the starter motor as even a small amount of unburnt excess fuel in the combustion chambers can raise the compression ratio
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post #12 of 16 (permalink) Old 11-20-2012, 01:11 PM
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Originally Posted by Cody Strife View Post
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?
All that does is raise the idle speed, it's cheaper than a stepper motor.

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post #13 of 16 (permalink) Old 11-21-2012, 02:05 PM
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These bikes flood really easily, and I think the primary cause is a weak battery. The cranking speed of the starter can be deceiving, as it can sound normal and yet you'll still not be getting much fire to the plugs.
Back when I was a kid, we had several "doodlebugs" (ours were chopped chevrolet cement trucks) and we always got our batteries at a junk yard for them. If you didn't get those straight 6 chevys started quickly, the battery would go flat, and then you would have to rummage around the battery pile trying to find one with enough juice to turn it over.
When I first got my Legend as a used bike, it would crank like a bastard at the first push of the starter button, but would fade fast if it didn't fire soon.
By the way, put in 42 mains and you'll not be needing that enricher very often. Most days in warm weather, I just touch the starter button and she fires up and instantly goes to a smooth idle.
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post #14 of 16 (permalink) Old 02-03-2013, 01:33 PM
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Smile low tech cold start method

Sorry to add late to the discussion, but only tried this recently and it worked like a charm. Because there's not enough cold cranking amps to feed the ignition, I needed to warm up the engine components before trying to fire it up. Ran a space heater under the bike cover (being careful not to block the rear of heater) to let warm air circulate to engine for 5-6 hours (or until the engine felt warm to touch). The TBS fired up in a couple of tries after sitting cold turkey in an unheated garage for the last 3 months of a cold Canadian winter (it's a long story why I didn't properly winterize it to begin with).

I also don't rely on the choke lever much, just open the idling screw to get up to ~1000rpm at first and when the rpms jump, then dial the screw back down to 1000rpm for normal idling.
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post #15 of 16 (permalink) Old 02-03-2013, 06:08 PM
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[QUOTE=ssevy;2430917]These bikes flood really easily, and I think the primary cause is a weak battery.


Never a truer word said.

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post #16 of 16 (permalink) Old 02-03-2013, 06:44 PM
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low tech cold start method

[quote=jaguartvr;2493883]
Quote:
Originally Posted by ssevy View Post
These bikes flood really easily, and I think the primary cause is a weak battery.


Never a truer word said.
Probably right about the battery. I made sure it was charged up before attempting to start, but warming the engine made a difference 'cause I've tried starting a number of times before with a fully charged battery without success.
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