95 Thunderbird Choke Issues - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 44 (permalink) Unread 08-27-2019, 01:16 PM Thread Starter
Grand Prix 125
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95 Thunderbird Choke Issues

Hello all, this is my first post besides my introductory post. I have a 1995 Triumph Thunderbird with 18,000 miles on it. Bought it from a dealer about 2 months ago. I couldn't ride it for about 3 weeks due to not having my permit. Got my permit and went on a ride and the bike was fine (that was on a Friday.)
Sunday comes and I go to take my bike out. Well I fire it up and it sounds rough at idle, starts dying and finally dies. I pull it into the garage and notice my lights are dim. Charge the battery. Bike won't fire. Check spark plugs. Fouled out. Black on the tips. Replaced those.
Now here's where my current dilemma is.
I re attached everything (battery, fuel tank and side panels) turned on fuel, starter switch, key, pull choke all the way in. Bike starts. About 20 seconds later I push the choke back, bike starts dropping in RPMs I continue pushing and the bike dies. Pull the choke back in, start again same thing starts dying right after I push the choke back. I have a video of it happening if it helps.
I'm assuming a pilot jet is clogged but the bike didn't sit for maybe a couple weeks while all this is happened. I added fuel treatment and it allowed me to push the choke a little further back.
Before I go taking it back to the shop/tearing into the carbs I wanted to check and see if I could check any other things first.

All input is appreciated! Thank you!
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post #2 of 44 (permalink) Unread 08-27-2019, 04:13 PM
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When mine did that it was because of clogged jets from fuel which had gone off. But you rode it not so long ago? Is your fuel cap locking or not? Just wondered if someone had chucked something in the tank.

Think I would drain the tank, replenish with super unleaded, maybe richen up the slow running jets then see what happens. For th erecord, my needle jets were mostly blocked with green gunk. :-(
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post #3 of 44 (permalink) Unread 08-27-2019, 04:35 PM Thread Starter
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Draining the tank and re filling with premium was my next step. Are the slow idle jets easy to access while still on the bike?
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post #4 of 44 (permalink) Unread 08-27-2019, 07:05 PM
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Plugged fuel jets and fouled plugs don't go together...

John
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2007 HD FXDL
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post #5 of 44 (permalink) Unread 08-27-2019, 07:32 PM Thread Starter
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What does that indicate to you then? Perhaps a too rich fuel mixture? Plugs were pretty black when I pulled them. I'm not totally convinced it is a plugged jet consider it didn't sit for long and it's summer here (Vermont.) I'm just trying to think of all possible things it could be/I can try
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post #6 of 44 (permalink) Unread 08-27-2019, 08:18 PM
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Either too rich or an ignition problem. For grins, put a volt meter on the (+) terminal on one of the coils and see what you get. Measure 3 conditions: key on engine off, starting (cranking) and running. If it won't idle, get a reading at higher RPMs and monitor what happens as the RPMs drop toward idle.

Vermont, huh? Is that anything like New Hampshire? Looking like another week or two in the riding season...

John
Laconia Bike Week 2019 - See you all next year
2007 HD FXDL
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1975 T150V, 1968 BSA Thunderbolt, x2004 Thunderbird Sport

Last edited by WSC; 08-27-2019 at 08:22 PM.
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post #7 of 44 (permalink) Unread 08-28-2019, 05:57 AM Thread Starter
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I will try that and let you know. Yeah just like New Hampshire's riding season super short, week or two left sounds about right.
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post #8 of 44 (permalink) Unread 08-28-2019, 07:59 AM
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Low 40's Monday AM! Back when I rode to work well into the late fall 40 was my cutoff.

John
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2007 HD FXDL
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post #9 of 44 (permalink) Unread 08-29-2019, 07:05 PM Thread Starter
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Update

So drained my tank, put fresh Premium gas in. Here's the readings.

11 - key not running
.9 while cranking
13.3-13.5 steady while idling choke all the way in.

As choke was pushed out may a .1-.3 drop as bike started dying
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post #10 of 44 (permalink) Unread 08-29-2019, 09:48 PM
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Quote:
Originally Posted by Thunderbird 95 View Post
11 - key not running
.9 while cranking
13.3-13.5 steady while idling choke all the way in.

As choke was pushed out may a .1-.3 drop as bike started dying
OK, I'm assuming when you say "choke in" you mean the cold start position, and "choke pushed out" you mean the warm running position, right? (If you look at the choke valves on the carbs you'll see this is backwards; they're out for cold and in for warm.)

".9 while cranking" makes me thing you're reading the (-) terminal on the coil. The one you want to read is the one that has the same color wire on all three coils.

That said, I don't think this is your problem, unless you're using the choke backwards..

John
Laconia Bike Week 2019 - See you all next year
2007 HD FXDL
1999 Legend TT
1975 T150V, 1968 BSA Thunderbolt, x2004 Thunderbird Sport
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