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I have a 1966 Triumph Bonneville, that is only running on one cylinder, can anyone help please?

I have fitted two new coils, HT leads, cleaned out both bowls, main jets, and banjo filters, still runs on one cylinder only!!

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6ya6ya
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fknstart
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SOURCE: Engine Fault light illuminates. Ford KA Collection

have you totally cleaned the fuse box and fuses

Posted on Jan 05, 2009

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SOURCE: Problems in wet weather and cleaning my triumph won't start.

Water is getting into your ignition coils.
Trace the spark plug lead up to the coil.
Get some ignition sealer spray and spray loads of it on the leads and coil.
When a bike is new, it is sealed. After washing with detergents it gets washed away. Spray the leads and coil once a week to keep them totally dry.
An immediate way to get round when wet is to spray wd40 on the leads and coil, it should start straight away.
But, don`t spray ignition sealer on until it is totally dry.
Hope this helps

Posted on Jan 26, 2009

Git-R-Dun
  • 6 Answers

SOURCE: I have a 1997 Triumph Legend, with approx 2200

If it is backfiring on deacceleration you have a fuel mixture problem and need to "sync" the carbs.
Sync Pro carb tuner works well. This is a precise four channel vacuum indicator designed specifically for intake synchronization of engines with multiple carburetors or throttle bodies.
Also, if you have not done so, check your plug wires for defects and resistors, if your wires have them.
Good luck, hope this helps.

Posted on Mar 16, 2009

  • 6 Answers

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

  • 1 Answer

SOURCE: 1988 audi 80 4cyl. no spark from coil,new coil fitted,coil lead

hi i have a coupe 1994 have same prob told by audi to replace the distributor as was common failt on audi's i have replaced new leads ,coil ,dissy cap, and arm ,still the same awaiting on distributor to see if this works hope this helps

Posted on Oct 18, 2009

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2 Answers

My JD SX 320 misfires under load (one cylinder only)


plugs will not spark under compression if they are faulty or the HT lead id off too high a resistance. or mixture is incorrect
In the real old times when plugs were cleaned and tested one of the tests were to test spark in a dry compressed air chamber where if there was a problem they failed to spark
as you have fitted new plugs it comes back to the ht lead
they are carbon tracked lined internally, the connection for the plug and cap is just a steel pin shoved up into the carbon track
try using copper ht leads where the copper wire comes out to the connection
there could be a valve seating problem or weak valve springs on that cylinder that is not allowing proper seating under compression
if you have 2 carbies then the float level for that cylinder may be too low and under load starving for fuel

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Could be one of the carbs playing up. Maybe a blocked or restricted jet.

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Hi, I would suspect that the dual coil is the problem, normally on the Bonnie you have a spark every other stroke. Because the engine is a parallel twin (both pistons go up and down at the same time) you are firing both plugs every time the pistons are on the ignition stroke. This is why you get a shock the HT has to go somewhere and you are releasing this to the frame when you take out a plug. Dual output coils are really designed for 4 cylinder bikes where the second spark can be lost during the firing cycle. Most old Honda's CB400/500/550/750 used the dual coil ignition system. You need to have a coil for each plug as you had before. Hope this helps

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How to identify motor size and type on 1966 triumph motorcycle


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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The pick-up coils fail sometimes but usually lead to a complete failure
Before just replacing parts u can eliminate some suspects ie kill switch,clutch switch & ignition switch by bridging
Also check that there isnt a spark jumping from an HT lead or plug cap

Ride Safe
Bike-Doc

Please mark as helpful(if it has been!!)

Aug 19, 2009 | 1995 Triumph Triumph Thunderbird

1 Answer

Problems in wet weather and cleaning my triumph won't start.


Water is getting into your ignition coils.
Trace the spark plug lead up to the coil.
Get some ignition sealer spray and spray loads of it on the leads and coil.
When a bike is new, it is sealed. After washing with detergents it gets washed away. Spray the leads and coil once a week to keep them totally dry.
An immediate way to get round when wet is to spray wd40 on the leads and coil, it should start straight away.
But, don`t spray ignition sealer on until it is totally dry.
Hope this helps

Jan 26, 2009 | 2004 Triumph Triumph Bonneville

1 Answer

Won't crank set up about 8 months


Start with the basics, (****, Squeeze, Bang, Blow).
Check fuel is getting to cylinder.
Check Spark plugs by holding on cylinder head and cranking see if sparks.
check compression, should be approx same across all cylinders usually about 120-140 psi at a guess. I have had an older engine still running fine with 100 psi. (Workshop manula tells exact limits)
Check exhaust is clear some idiot could have blocked it for a laugh!
check air filter is fairly clean. Oil type can be cleaned paper type are disposable. I would initial just hoover it if its a paper one.
If you have a spark and fuel and compression and it still plays up check the ht leads are in good condition, even dirty plugs can arc to earth loosing the vital spark needed. Older coils do tend to break down particularly yamaha ones! I do not know where triumph source there parts but i know it is from various countries.
Hope this helps a bit

Ian

Jan 24, 2009 | 1996 Triumph Adventurer

1 Answer

Running problem


Hi,
Check and clean spark leads, check and clean distributer cap or around coil pack areas.

Most likely cause is a fault around this HT area and distribution of spark.

Use an ignition sealer or buy a new set of HT leads - and replace them in the correct order (do one at a time).

Hope this helps.

Jun 13, 2008 | 2001 Chevrolet Silverado 1500

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