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if some are firing then the voltage is right, something is happening at the cylinders that are not. if you take the spark plug out on a non firing cylinder and leave it connected and hanging from the wire you can turn the engine over and observe the spark, if it sparks then you can rule out the coil.
The ignitor is the brain that fires the coil. The distributor sends a signal to the ignitor, so if you have power to the coil either component could be defective. You may need a shop manual to get the testing procedures for the ignitor.
It's the pick up coil.. you can check it at the plug under the tank. there will be one plug with 3 white wires on it then right next to it and wrapped together with it is a plug with two wires, one light grey and the other dark grey. check those with an ohm meter. it should read i think between 182 and 220 ohms. if its bad, it won't send the signal to tell your coils to fire the spark. Its all explained here.. http://www.650ccnd.com/coil.htm
will try to help.try checking the ignitor assesmbly,with out it your truck will not get fire or low fire,so low you won't catch it. the ignitor gives it an extra boost of fire to ignite the gas in the cylinders. try that,but if it checks bad,used ignitors must match numbers with old onr. try used auto parts online. hope this helps and thank you for choosing fixya.com
It all sounds like you have a bad computor. If you are not getting fire from the coil. The source will lead you back to the brain source, (The Computor). Go to the local junk yard to get another one at half price.
You said the motor cut out and popped and backfired when it quit, this is almost always one of two things; either the low speed pulse coil or the actual CDI "black" box. You will almost never lose a main coil. One thing I would also check to make sure did not happen is shearing a flywheel mag key. When the motor backfires you can easily shear a mag key if you have a heavy flywheel, (external). However when this happens you don't usually lose spark but it will certainly cause the backfire. One other item of importance is that the bike you are in question about does not emit a bright spark when you are checking for fire. Make sure you are using a brand new plug and ground it on the head. Try to make sure you are in a dark environment when you check the spark.
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