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Re: My wipper snipper has no spark, Ihave bridged out the...
The switch is a kill switch that grounds out the spark, at least that is how mine is. So assuming you have it correct, and new plug, that leaves the ignition coil. Only component left.
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When checking for a spark you must make sure the spark plug is well earthed against the cylinder, and give the starter a good pull, if there is no spark try a new clean plug ( make sure the ignition switch is on ) if all this fails then unfortunately you may well need to fit a new ignition coil, this will be situated under the covers against the flywheel.
What make, model, year is the bike??? The coil likely has no gap to set. Do you have a points type ignition system?? The spark plug and any other gap(s) will always be critical so do not rely on a bit of business card or other thing unless you know it is of the correct or close to the correct thickness to achieve the proper gap. With points if the gap is to large the dwell will not be sufficient to allow an adequate voltage rise and if the spark plug gap is too small it will allow a weak spark to jump too soon and if it is too large the spark may never reach a high enough voltage to bridge the gap. It could be so weak, so low voltage that it will not bridge a spark plug gap or you will not see it or otherwise evidence it because it is so weak. If there is spark but weak and the bike will not fire this is exacerbated with increasing compression pressure as it will be harder for the spark plug to fire/spark as required with increased pressure. With some bikes if you have both of two spark plugs disconnected ie wires not grounded at the plug end there will be no spark produced. That is another reason why bike information is needed to properly address your question. Also one would like to know how you are testing for spark? You also should provide some history of the problem and why you have done whatever you have done so far?
First check the safety switch under seat is working by bridging the gap. Try the same with the safety switch on hand brake. Check fuse hasn't blown. Check spark plug is intact and cable is correctly fitted. Check in line fuel filter. Ensure battery is fully charged, a drop in output will result in not starting. Hope this resolves the problem. Gareth
There is very little to go wrong with a newish spark plug, so it is either getting to hot ans whiskering the plug gap ( the plug will look very white around the electrode and a tiny whisker will bridge the gap ) or the porcelain insulator on the plug electrode has suffered carbon fouling due to the engine running too rich, in which case just clean the plug so as the porcelaine is white again.
If it wasn't misfiring before. Make sure you have the proper gap on the spark plugs. Make sure you have the wires connected in the correct order. If you have the old wires, you may want to end up trying those one at a time to make sure you don't have a defect wire either. Thank you, Lee
Spark plugs like any electrical device become worn over time. Spark plugs also work under extreme condition. The use of cheap fuels will leave deposits, poor maintenance, bad air filters, old plug wires, all these items can cause a spark plug to fail or not perform at its peak level. Also spark plugs use a gap or Electrical bridge that is used for high voltage to arc across. The larger the gap the hotter the spark until you reach a point that the coil can not bridge the gap and then you get a misfire. Also when a plug gets deposits from either oil, poor fuel, carbon this will shorten the gap and cause a weaker spark resulting in poor performance, wasted fuel and engine dieseling or Run on after the ignition is turned off. These are the simple reasons for spark plug replacement.
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