Question about 2005 Aprilia Tuono 125

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Spark Plugs....

Hi guys

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Just interseted in what sort of plugs fellow members run in their T's read somewhere that the best improvement one member made was to change his plugs to Iridium ??? (and that is excellent spelling of the word too!) Hey W-dog welcome aboard. No answer here for the sparkplugs....but Where are you in NZ? I spent some time there in the early 90's, lived in Takapuna and Christchurch. Did the Milford trek my last week there, then split, beautiful country you've got ,,,

Posted on Nov 10, 2008

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2002 harley electra glide front spark plug turns black


A blackened spark plug is a sign of a rich air/fuel ratio or a misfiring plug. You stated that you changed the coil and wires, but did you change the plugs? Spark plugs, even new ones, can, and do, go bad (excessive internal resistance). Make sure that the plugs are also the correct part number for your application, as they could be of the wrong heat range for your bike. I have even heard of guys using a colder plug in the rear cylinder and a hotter plug in the front cylinder because the front cylinder tends to run a little cooler than the rear (increased air flow in the front).

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No spark to spark plugs


Hi Anonymous, and the usual suspects are:
1. Plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discarged.
6. Damaged wire or loose connections at battery terminals,
ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. If your bike has a CKP sensor you must leave both plugs in
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Visit website below for possible clues:
http://www.cv-performance.com/harley-diagnostic-trouble-codes/
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Hi guys, i have a 89 heritage softail 1340 with stage 3 cam , mikuni carb and some work done to heads and was just wondering what size spark plugs should i be running ?


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1 Answer

1988 sportster / no spark at plugs


Hi Anonymous, the CKP sensor needs compression to send correct signal to the ICM/ECM, make sure both spark plugs are in heads and use a grounded third plug to check for spark or hold spark plug cable close to spark plug in head. If still not getting spark the usual suspects are:
1. Fouled spark plugs.
2. Battery voltage below 8.7 volts, loose or broken battery cables especially ground cable to frame.
3. Loose connection at ignition coil or plug between ignition sensor and module.
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Hi u guys please can u help me. I have a 1988 K100LT it has just had a new battery fitted and iv just cleaned all the spark plugs put them back in the bike and now it wont start why do u this this is help...


never clean up a bmw spark plug,,,all ways fit new ones,,,have you got the plug leads on in the right order? i hope you never tryed to spin the motor over without grounding all the spark plugs first???? if you did you could have blowen up your ignition computer

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1 Answer

Spark Plugs


Stick with the stock HD plugs because of the ion sensing.

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