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How can a cdi unit send a charge to one cylinder but not another on a triumph twin

Triumph America. Right side cylinder occasionally stops firing...random. Will kick back in at full power before dropping out again later. Any suggestions welcome. CDI unit query is based on my theory that there is only one unit but two cylinders...how can the CDI unit be faulty.

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  • 3 Answers

Change both plugs

Posted on Mar 24, 2014

Testimonial: "Have done that. No change to problem."

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Posted on Jan 02, 2017

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SOURCE: Triumph Bonneville America 2002, misfires for

is it electronic ignition? - if so, the ignition heat sink unit may be gone...should be s omehwere on the underside of the tank shroud. do you have a manual for it?

Posted on Aug 06, 2009

DoubleClutch
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SOURCE: triumph 900 trophy, fires on two cylinders, third fires on &off

Its a carbonation problem or ignition problem.

Posted on Sep 30, 2009

Testimonial: "thanks i know this it was finding it ,have sorted it ,was a coil braking down ."

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SOURCE: my triumph bonneville 2005 america has just

Just a very quick check,Swap the sparkplugs over.Don't put in new ones.If the problem follows that plug,it is only the sparkplug.Hope you get it fixed

Posted on Nov 17, 2009

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Posted on May 03, 2010

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SOURCE: Triumph T'bird sparking only on No.3 cylinder

try changing No.1 or 2 coil to No3. wiring to make sure coil is sparking if not you may have two faulty coils

Posted on May 28, 2010

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2002 triumph america I'm running NGK DPR8EA 9 spark plugs ,I'm not getting much spark do I have them gapped at 035.


Hi, Mitchell for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Triumph, despair not, for a mere $10 you can download another one.
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Hi, Rex and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking check for spark leakage in the dark.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
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10. Old dead or bad fuel.
11. Faulty fuel pressure regulator
12. Pinholes in the in tank plastic convoluted tubing from the pressure regulator to the quick disconnect check valve.
13. Fuel tank vent system plugged.
14. Throttle body controls misadjusted.
15. Damaged throttle body or intake seals.
16. Loose, dirty, or corroded ignition module connector at crankcase.
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http://motorbike-search-engine.co.uk/classic_bikes/triumph-classic-motorcycles.php This link should help. I had a 550 way back when. There was also a Bonneville model that was 660. Both are side by side twin cylinders. The bike was not hard to work on but it rattled and required chain adjustments and frequent maintenance on the crappy electrical (Lucas) system.

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Hi
With Ignition switch off :-
1st Check for bad connections, broken/crushed wires, continuity & resistance between the cap, HT lead, coil, ignition coil primary wires
2nd Disconnect the CDI unit from its connector & check for the same between the loom side of the connector back to the coil
3rd Check coil is earthed

If all OK suspect the CDI unit but double check everything first( there are some more checks as well), as these are very expensive

Ride safe
Bike-Doc

Please rate this solution well if it has helped !!
Any comments welcome


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1 Answer

Triumph Bonneville America 2002, misfires for first 10 miles or so, then suddenly clears and runs well. Appears to be running on one cylinder.


is it electronic ignition? - if so, the ignition heat sink unit may be gone...should be s omehwere on the underside of the tank shroud. do you have a manual for it?

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