Question about 1996 Triumph Trident 900

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I have a 93 trident with a misfire/stumble below 2500rpm.ive cleaned out the carbs but the problem is still there.the air screws are two & ahalf turns out,is this ok as the manual i have doesnt give a setting?ive also found that if i just crack the choke on the fault goes away.could it be its running too lean?

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  • Graeme Ross
    Graeme Ross May 11, 2010

    Yup certainly sounds like running too lean. How many K's has the bike done, and what sort of carbies does it have fitted?

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If it runs better with the choke on, you have a partially stopped up pilot jet circuit, or are running lean. If you removed the jets and were able to spray cleaner through the ports easily, then you may still be running lean. If you didn't remove the jets, then you didn't clean the carbs.

Posted on Jul 14, 2009

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Had a similar problem. Turned out the fuel/air mixture needed a tweaking which I had the shop perform. Perfect ever since. The carbs on my Dent are very touchy and need exact settings to run right.

Posted on Jul 29, 2009

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1 Answer

Bike only idles for a few seconds (hot or cold) replaced s/plugs cleaned & sync carbs, slugish till around 2500rpm but no problems after that


Clean them better, or check for off Idle fuel adjustments on them.

Also not that garbage in the tank can be clogging the internal strainer reducing flow.

Happening at only the 2500RPM area I would inspect the secondary / Off Idle Jets just above the throttle plates for clogging............ soak them in cleaning solvent, use a torch tip cleaner, blow them out with air ect.

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Hey just wona know where the air mixture screw on my carby should b set at coz i jus bought the bike n found the screw is wwound all the way in wot should i do


Most air mixture screws you never have to mess with. In your case, someone else decided to do this for you. First, if your bike is running rough, make sure you do a THOROUGH cleaning of the carbs so that when you DO set the air mixture screw, it will do its job correctly. The normal procedure for the air screw is to start with the screw a few turns out (counting exactly where you are starting from) For this particular bike, lets say 2 full revolutions. Now, with the bike running, (it should be able to run as long as the carbs are clean) screw the mixture screw out however many turns it takes until the motor stumbles a little. This can be hard to hear sometimes, so you may have to repeat this step. When it stumbles, record how many turns it took. So, for our example, 2 turns, plus you turned it out another 2 turns, making it "stumble" at 4 turns out. Now, reset the mixture screw to 2 turns out. Do the opposite and screw in now, making note of when it stumbles again. lets say it stumbled at 1 turn in. Now we know that the best possible solution is to put the air screw between 1 turn and 4 turns out, which means you should set it at 2.5 turns out (which is half way between 1 and 4 turns out). After all of that is done, you will want to double check the synchronization of your carbs to make sure they are all within spec of eachother. I hope this helps.

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Almost always, the described idling problem would be a carb issue. The carbs set has to be pulled down, fully dis-assembled, all non-rubber parts soaked in carb cleaner and cleaning be done specially on the jets and pin holes.

In some instances high idle could be caused by a vacuum leak in any of the rubber coupling between the carbs and the intake manifolds.

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Remove the throttle stop adjuster and the air screw adjuster and spray carb cleaner in the holes.
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5 Answers

Misfiring, stalling. idle surges. does not idle


Tabbycat gave a very good answer. The pulse sensor could be the problem. If the sensor checks out okay then it is time to look at the rest of the CDI ignition. Next would be the carbs. ALWAYS have a fire extinguisher at hand when working on carburetors.

Drain the carburetors. There should be a screw on the lower side of each carb float bowl. Remove the screw then replace it after the fuel drains. Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, (not all bikes have a water trap bowl). Turn the gas back on and wait a minute for the carbs to fill with gas. If the bike doesn't start and run properly then shut off the gas and remove the carburetors from the engine.

FOR EACH
carb > Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the
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Please rate this solution. Thanks!

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