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...I have a problem with a 2002 with only 3500 moiles on the clock... it wasn't running well at low rev's. When in traffic in 1st gear below 2,000 revs if cough's and splutters as if it may cut out. When above 2500 it runs great.
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Where is your idle set? If it's not right on 1,000 rpm the engine can be a bit erratic coming off idle.
Have you had a carb balance recently? If the balance is off that can affect low rpm performance and cause misfiring.
What's the condition of your battery? Triumphs are notorious for boiling batteries and a 3-year old battery could well be on it's way out.
Check the battery voltage with the ignition turned off. A good battery will read between 13 and 13.2 volts with no load and fully charged. Check the voltage again with the ignition on and the engine not running. It should read a minimum of 12 volts.
If the battery is weak the voltage will drop at an idle and you may get misfires until the alternator takes over -- usually someplace from 2500 to 3500 rpm.
Remove the battery cables, wire brush everything until shiny, grease everything and reconnect it. That will eliminate a poor connection from the list of possibles.
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I have tried a cleaner in the fuel
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Good move -- a bit of varnish in the pilot circuits could be driving the mixture excessively lean. You might want to remove a float bowl and check for dirt and varnish buildup there. If there's crud you'll want to pull all the bowls and clean them out. Also check the tiny filter hidden in the fuel line "T."
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and tested the HT coils with the following readings rimary Coil Secondary Coil
No.1 0.5 8.5
No.2 0.5 7.0
No.3 0.5 7.0
Should be 0.63 10.5 according to Haynes book.+/- 10%
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The primary resistances are probably OK since most meters are pretty inaccurate below one ohm, but I'd be a bit concerned with the secondary resistances since shorted secondary turns are a common coil failure mode.
Shorted turns make for a "weak" coil that misfires if the system voltage is low -- like at an idle. Basically, the shorted turns reduce the voltage multiplication of the coil and if the input voltage is low there may not be enough voltage on the secondary to fire the plugs.
Try connecting a spare spark plug to the coil wire and grounding the metal end with an automotive jumper/booster cable to a good ground. Crank the engine and look at the color of the spark. If it's fat and blue, the coil's probably OK. If it's thin and yellow it's weak. Do the same with the other leads and note the spark colors -- they should all be blue.
If all three coils are showing a yellow spark, check the system voltage again. It's entirely possible for all three coils to fail simultaneously but it's not common. If the battery is putting out 12 volts at an idle it should be OK.
Another test for weak coils is to replace the spark plugs. New plugs have sharper edges and fire more easily than used plugs. If the problem clears up for a while and then returns, it's weak coils.
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I havn't checked the Pickup coil yet...
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The pickups usually fail with increasing temperature and shut down until they cool off a bit. Rpm and voltage sensitivity is usually not an issue with the pickups.
Good Luck!
Jim
Linear Mode
