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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 11-15-2012, 05:49 PM   #1 (permalink)
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Carb jets ?

Now then, i'mm sure one of you technicaly minded chappies out there could tell me which jets i should fit into my 2006 carbs ,my bonnie has 2 into 1 Arrow pipes and has had air box removed and K+N cone air filters fitted. it runs ok but now and again i get a spit back,and at full throttle it feels fuel starved. i am happy to change the jets but i don't know to which ones.i can find which to change to when fitting the arrow exhaust,also when romoving the air box , but not when both conversions are carried out,there has got to be someone out there done these conversions, and will know which jets to fit . Thanks for listening..
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Old 11-15-2012, 10:02 PM   #2 (permalink)
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factory Keihin jets

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Now then, i'mm sure one of you technicaly minded chappies out there could tell me which jets i should fit into my 2006 carbs ,my bonnie has 2 into 1 Arrow pipes and has had air box removed and K+N cone air filters fitted. it runs ok but now and again i get a spit back,and at full throttle it feels fuel starved. i am happy to change the jets but i don't know to which ones.i can find which to change to when fitting the arrow exhaust,also when romoving the air box , but not when both conversions are carried out,there has got to be someone out there done these conversions, and will know which jets to fit . Thanks for listening..
If you bike is close to being properly tuned as you say what ever main jet you HAVE IN THERE NOW, when you pull out the main jet it will be marked (for example 125) if it is a stock factory Keihin jet then you can just go to any motorcycle shop and buy the next jet size up. (richer) That sounds like what you need. Change the main before you dink around with other settings. Do ONE step at a time.
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Old 11-15-2012, 11:19 PM   #3 (permalink)
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Yeah, it would be good to let us know what you have in there now. You should probably be in the 42/145 range. Is your motor the 790 or 865? If you have a T100 in 2006 I think they have the 865.
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Old 11-16-2012, 01:07 AM   #4 (permalink)
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Honestly, no one can tell you accurately what to run. They can give you a ballpark idea, but I wouldn't go that route IMO. Every single bike is different, and so are climates and altitudes. I'm running jets that many think are too rich, but 2 dynos/2 sniffers that tell the same story aren't lying. Once you start engine mods, either a dyno or an a/f gauge become a necessary part of the game, unless you just like to live on the edge.
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Old 11-16-2012, 02:01 AM   #5 (permalink)
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Jets

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Originally Posted by timfish View Post
Now then, i'mm sure one of you technicaly minded chappies out there could tell me which jets i should fit into my 2006 carbs ,my bonnie has 2 into 1 Arrow pipes and has had air box removed and K+N cone air filters fitted. it runs ok but now and again i get a spit back,and at full throttle it feels fuel starved. i am happy to change the jets but i don't know to which ones.i can find which to change to when fitting the arrow exhaust,also when romoving the air box , but not when both conversions are carried out,there has got to be someone out there done these conversions, and will know which jets to fit . Thanks for listening..
If the conversion is new then you will be extremely lean.

There is no right jet as there are many variables, altitude etc.

As stated you will need to see what you have in there at present.

The simple, quickest but least rewarding is to get it put on a dyno and have it tuned.

You need to check the serch engine in the forum as the jet removal is easy once you have done it once! As there will be a few strip downs unless you are lucky. Screws need to be changed (bowls). To do it right you may well benefit from some shims for the needles.

If your bike was previously converted, you need to balance the carbs and if the mileage ius up check the valve clearances. These both make a big difference to smooth running.

You might want to google up jenks guide or check in the stickyies as there is lots on carbs. There is pics of where the jets are. They have some guidlines on jets, i found they werent to far off others disagree, just goes to show the value of a dyno! At least you can get a ball park.

As for jets ideally a Keihin dealer (and the shims) cheapest option, Harley dealers they have used Keihins and are cheaper than your Local Triumph dealer.

Me on a 865 bonnie, staintunes with a totally gutted airbox and opened inlet was running 135 main in the end and good on the A/F. Bear in mind that is at sea level, with Aus quality fuel (good/ bad who knows, no ethanol!!)
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Old 11-16-2012, 03:02 AM   #6 (permalink)
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Here's an old thread that might be useful:

http://www.triumphrat.net/twins-tech...esults-11.html
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Old 11-17-2012, 12:37 AM   #7 (permalink)
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On my 2006 T100 I'm running 140/42 with one shim and 3 turns out, to great satisfaction.

I will try another shim, but I think I'm in the sweet spot.

.
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Old 11-18-2012, 08:50 AM   #8 (permalink)
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Thanks to all for your advice, thats what i love about this forum so meny knowledgable and helpfull people, ill strip my jets out and see where i stand.
Thanks again . Tim.
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