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post #1 of 12 (permalink) Old 06-14-2019, 01:36 PM Thread Starter
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Main Motorcycle: 2005 Triumph T100
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Cold start questions

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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post #2 of 12 (permalink) Old 06-14-2019, 07:21 PM
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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.

Ride safe,

Quentin
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post #3 of 12 (permalink) Old 06-14-2019, 07:32 PM
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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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Neil in AZ
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post #4 of 12 (permalink) Old 06-14-2019, 07:36 PM
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I'm going to move this over to the Twins tech section also.

“Its all about motorbikes. Always has been, always will be”

Neil in AZ
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post #5 of 12 (permalink) Old 06-14-2019, 08:10 PM
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Main Motorcycle: 2005 Bonneville Blue 790
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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.

Marty
2005 Bonneville Blue 790cc, AI removed, Staintunes RC, no snorkel, inlet enlarged, 118/40/NBZT needles/1 shim/3 turns, Ikon 7610s, Ricor Intiminators, Barnett green clutch springs, Michelin Pilot Activs, D9 gauge panel, tachometer.

Last edited by Baltobonneville; 06-14-2019 at 08:13 PM.
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post #6 of 12 (permalink) Old 06-14-2019, 08:38 PM
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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.

07 Tiger 1050,K&N Filter,Snorkel Removed,Storm GP Exhaust,20550 Frankentune Map,NGK Iridium Plugs,Ricks R/R,Ohlins Rear Shock,Ohlins Front Springs,Bar End Mirrors,LED Spots,Leather Seat Cover,Ebay Levers,Ebay Risers,Custom Bars.
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post #7 of 12 (permalink) Old 06-15-2019, 04:25 AM
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Mine was the same, thought it was "normal", then I disconnected the TPS, what a difference. you can only try...
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post #8 of 12 (permalink) Old 06-16-2019, 11:41 AM
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Quote:
Originally Posted by Cloudy View Post
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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post #9 of 12 (permalink) Old 06-17-2019, 11:06 AM Thread Starter
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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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Last edited by sodhipop; 06-17-2019 at 11:27 AM. Reason: Wanted to update the group in a more thorough way.
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post #10 of 12 (permalink) Old 06-17-2019, 01:08 PM
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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.

Marty
2005 Bonneville Blue 790cc, AI removed, Staintunes RC, no snorkel, inlet enlarged, 118/40/NBZT needles/1 shim/3 turns, Ikon 7610s, Ricor Intiminators, Barnett green clutch springs, Michelin Pilot Activs, D9 gauge panel, tachometer.

Last edited by Baltobonneville; 06-17-2019 at 01:14 PM.
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