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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-13-2012, 01:01 PM   #21 (permalink)
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Quote:
Originally Posted by denbow View Post
If you twist the throttle whilst pressing the starter button the carbs will flood with fuel and can soak the spark plugs = bad or no start.
Got it. Of course.
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Old 11-13-2012, 01:25 PM   #22 (permalink)
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Quote:
Originally Posted by road dog View Post
If you have zero performance mods you would likely be running on the lean side, as the carbed Bonnies are notoriously lean from the factory.
Guys, this is a fallacy. They are only lean if you analyse the exhaust gas with the AI still installed.

Why would Triumph ship bikes out of the factory all round the world in a lean state? Weather conditions can be massively different, imagine a lean Bonnie going out on a freezing cold high pressure day and running even leaner. At the very least the bike would pop and fart through the carbs and at worst they would have a warranty claim.
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Old 11-13-2012, 02:54 PM   #23 (permalink)
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That makes good sense, PieMan. I've read that carbed Bonnies run lean from the factory so many times I believed it. Thanks for reminding me that one shouldn't necessarily believe everything they read on the internet.
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Old 11-13-2012, 03:01 PM   #24 (permalink)
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to lean to make max power is one thing to lean not to burn up is another.Most on this side of the pond are to lean to make max power and in some cases to lean to run very good.Mike your bike might check to be lean some places over here if its right at your place.triumph cares about 2 things only that they pass epa and they run good enough to sell them.There are some stock bikes over here that check 14to1 or alittle more on the lean side.They wont burn up at 14to1 but they wont run there best ether.
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Old 11-13-2012, 03:05 PM   #25 (permalink)
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Quote:
Originally Posted by PieMan View Post
Guys, this is a fallacy. They are only lean if you analyse the exhaust gas with the AI still installed.

Why would Triumph ship bikes out of the factory all round the world in a lean state? Weather conditions can be massively different, imagine a lean Bonnie going out on a freezing cold high pressure day and running even leaner. At the very least the bike would pop and fart through the carbs and at worst they would have a warranty claim.
In the US, we are cursed with ethanol/gasoline blends. A 10% ethanol blend requires 3% richer tuning to match pure gasoline. 15% ethanol blends require 4.5% richer tuning. This situation, along with EPA and CARB compliance make US carbed Bonnevilles "notoriously lean", indeed. Until I shimmed my needles and enrichened my idle mixture, I could hardly start my '03 T100 on cold days. It would help if the European manufacturers would obtain homologation with the fuels we Americans actually have to use...
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Old 11-13-2012, 07:10 PM   #26 (permalink)
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Update: Okay, so it wasn't really cold when I rode home from work today. It was about 54 f or 12 c.

It started without any hesitation. I didn't touch the throttle for the first time ever.I guess I was flooding the carbs. Who knew? Well, denbow did.

I'll see if that is the answer when it is truly cold out. Thanks everyone for contributing. Man, I've got a lot to learn. So far, I'm loving the process... not as much as riding... but it's pretty cool too.
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Old 11-13-2012, 07:15 PM   #27 (permalink)
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That's great news, everybody has to learn somewhere and here's as good a place as any.
See how she (or he) goes in the cold and keep us informed.
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Old 11-13-2012, 07:33 PM   #28 (permalink)
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Mine became much easier to start after I installed slightly larger main jets, NBZT ("Thruxton") needles, and a thin shim under each needle.

It is true that if you give it any throttle while trying to start, you'll kill it immediately.
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Old 11-14-2012, 01:04 AM   #29 (permalink)
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Quote:
Originally Posted by golfingirl View Post
Who knew?
Those that have read the owners manual...

I quote: • Leaving the throttle completely closed, push the starter button until the engine starts.

For those that can't leave the throttle alone try the following: Just before you press the starter button, take up all slack or play in the throttle, press button and once the engine is cranking happily open it a little. She'll burst into life.

Last edited by Forchetto; 11-14-2012 at 01:16 AM.
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Old 11-14-2012, 05:34 AM   #30 (permalink)
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