Triumphrat

Sossaman

My new T-100 (no mod's) is very difficult to start. I have tried all the variations I can think of, for choke in / out / partial; with throttle / without throttle; twist a few times to try and get some fuel in the carb, all for not. When it's cold it takes at least 1/2-dozen tries to get it to stay running. It catches & fires quickly, but then only runs for a few seconds at very very low idle & dies. I repeat this several times until it finally is warm enough to stay runnning. Once started and a couple minutes of warm up, it runs well. It seems the carb start / pilot circuit is not providing enough initial fuel to get me off to a good start.

Jenk (tJP) "Tuning Notes for the TRIUMPH Bonneville Family of Motorcycles" says riders have had mixed results improving cold start with a 42 pilot screw setting of 2.5-2.75 turns. Since my idle & low speed transitions seem fine, I don't think there is a pilot circuit issue, so don't want to jump in here yet.

The service rep at my dealer has told me there have been some (not many) problems with blocked pilot / starter circuit passages in the carbs from the factory. I have not found a good diagram that shows the starter jet or how it feeds, so am not sure how accurate / plausible this info is.

1. Do these bikes usually fire right up?
2. When the choke is pulled, should it be starting & running at a slightly higher rpm without incident, until warm (as I expect from a normal choke / enrichner carb circuit) ?
3. Has anyone had this blocked passage issue on their new bike?
4. Do you know a good ref for the stock carb with an exploded view, so I can get a better idea of how the circuits flow?
5. Any other ideas?

Thank you,
Sossaman
2007 T100

rick05rocket

not sure what would be causing your problems.

However, the bike should, fully choked, start right up first hit, and run at a slightly elevated rpm. ..

One tip I got for cold starting is to turn on the key and wait about 10 seconds or so and THEN hit the starter button. . .there's like a preheater in there (similar I guess to what happens with a diesal engines glow plug) that facilitates a quick start.

Should not take more than four or five minutes of normal operating to fully warm up, even in cold temps, and then you should be able to push the choke back in and have a "normal" idle speed.

ride on

rick

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Gob-ny-geay

Try this for exploded views, etc.

[http://members.aol.com/roundr1/cvk40.html]

Sorry, try this one...

[http://www.gadgetjq.com/keihin_carb.htm]

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Bob

"If you're not part of the solution, you're part of the problem".

"Ecurie Sportive" - For the love of the sport.

Geoff

With no mods at all, I would suggest making the pilot screws richer. this will probably fix it, unless there does turn out to be blockage in the idle circuit
G

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I never wanted to lead, and I never wanted to follow.
I just wanted to ride

Sossaman

Thanks very much for the input. Now I know what it should do and have a couple things to try. I could not get the links to download, but will try from my computer at home. If a little more pilot doens't help, I will also take her into the shop, and see if they can find any blockages. They said they would check this for free, since the bike is still new.

CAPTDON

Mine ALWAYS lites up on the 1st click. I guess Id better knock on wood?

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CAPT D

Old Greaser

Must be a fault there somewhere. Fixable under warranty. Let Triumph worry about it.

My '07 T100, no problems. Switch on, turn fuel on, pull out the choke and starts first time. Runs at about 1100 - 1200 rpm and slowly climbs up. As it warms up the choke retracts and brings the revs down. When warm it runs about 900 - 1000 revs and I have to push the choke in for the last 1/4".

Ernie.

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Brits rule OK.

tomville

Where are people getting this from? I've read several similar comments recently. There is no preheater or glowplug for cold starts.

A carb heater is for preventing carb ice, which can form during operation.

http://faq.ninja250.org/wiki/What_is_carburetor_ice%3F

This site had a good summary of carb ice issues.

Geoff

people keep pulling that out of their arse, afaik. I argued the first 300 or so times but now i'm a beaten man
G

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I never wanted to lead, and I never wanted to follow.
I just wanted to ride

Old Greaser

Dead right about the heater. Geoff - I'll be by your side at the next onslaught for back-up.

Ernie.

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Brits rule OK.