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Discussion Starter #1
So I recently got a 2005 Triumph Bonneville T100 and I live in Los Angeles, CA where it's pretty nice year round. Lately the nights have been in the 60s Farenheit and I'm having trouble getting her going which I guess I get b/c she's an older bike, but 60 is not cold at all.

She was not having issues for the first few weeks as it was definitely warmer but she's having more issues when left overnight or even when not used after 4-5 hours.

I'm new to riding motorcycles so I'm trying to get an understanding of things and have definitely been looking up stuff online.

I'm pulling the choke out when starting, which seems to help but she still takes several attempts to even get a good cough out of her. I've found that with the choke pushed in and pushing start with a little gas seems to get her going more so than with the use of the choke.

What is the best procedure I should take when starting from a complete cold start? I'd love any tips and suggestions, please and thank you! ~ sodhipop
 

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Don't touch the throttle, the factory owners manual says not to. I never did with my 05 T100, and she started up ok. If you need the choke use it. But don't let it run too long on the choke. Make sure all your rubber pieces are good and not dry rotted or missing.
 

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Try a 1/2 turn out [ ccw] on each air fuel / pilot screws. See if that helps. You don't list or show if there are mod's done. But essentially what you are describing is a primary circuit issue. Probably too lean a mixture. So adjust the A/F screws out will add fuel to the primary circuit.
 

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Try a 115 main jet. Your original might be a 110. See which needle you have and install NBZT if they're not there already. Then adjust the pilot screws and synch the carbs if you can.

And as already mentioned, do not apply any throttle while trying to start, it absolutely will not start if you do.

My 2005 was notoriously reluctant to start in cooler weather until I made these changes. It still doesn't idle easily off-choke when cold, but I don't care because I can control that with the throttle until the motor thoroughly warms up, usually 15-20 minutes of riding.

If you're not sure how to go about doing this, download a copy of the "Jenks Manual" for much more information.
 

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Before rushing off and making all sorts of adjustment give her a new set of plugs, can make all the difference especially if you don't know when they were last changed.
 

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Before rushing off and making all sorts of adjustment give her a new set of plugs, can make all the difference especially if you don't know when they were last changed.
My thoughts exactly. First thing everybody wants to do with a carburetted engine is "tweek" with the carbs. All it needs is good spark. Those engines are the most easy starting engines on the planet. Fresh plugs and a good battery should do the trick. ...J.D.
 

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Discussion Starter #9 (Edited)
UPDATE: So this weekend I tried a few different start-up attempts. Some with the choke pulled out all the way, half-way, and not using the choke at all. What I've noticed is that she tends to fire with the choke not being used and just the oh-so slightest amount of gas (like a half twist on the throttle). She fires up and idles really well and has no issues going into gear like a minute later.

What is the major harm in using the throttle though? Aside from flooding the engine, which I understand is a concern, I'm just giving the slightest bit for it to fire up.

As far as other things you all mentioned, tubes and spark plugs down there are all brand new. I will check the battery charge as well. Any recommendations on a good battery I should be using in case it's the battery?

Will definitely get the Jenks manual (ordering one today)!
 

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No harm in using the throttle. It just prevents the motor from starting. If it works for you, that's fine.

This is not a spark plug or battery problem, by the way.

The stock Yuasa YTX12-BS battery is fine, but you should consider replacing the regulator-rectifier with a MOSFET unit if you have charging problems or the battery dies prematurely, i.e. in less than three years. The regulator-rectifier is marginal when new and gets worse as it ages.
 

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Discussion Starter #11
Thanks @baltonbonneville and EVERYONE for your help! I will keep an eye on her as I get more and more used to her and figure out her nuances.
I've noticed that she fires up perfectly with just the SLIGHTEST amount of throttle and NO CHOKE. If I use the choke sometimes it doesn't quite catch unless I use the throttle.
She then idles smoothly and PERFECTLY w/o any stalling.
 

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Give your idle speed adjustment screw a 1/4 or 1/2 turn upwards, then you will not need to use your throttle anymore and it should start perfectly every time.
 
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