The problem is you can't see those pesky electrons. Buy or borrow a simple ohm meter. set it to K ohms and stick one lead up one plug cap and stick the other lead up the other plug cap. You should get a reading and then compare it to your other coil. Then take off the plug caps and take a readingthru the wires.Test each cap they should have about 5K ohms resistance each. Look for a difference. As far as carburation, the FJ's in the states have a small port on the header pipe with a 10mm bolt plugging it. That port is for hooking up a exhaust gas analizer. Yamaha shops here in the states at one time were required to have a EGA to meet emission standards. If you don't have access to a EGA machine and the bike misses at idle to low speed you can uncover the idle mixture screws on the carbs and then as the bike idles badly screw each mixture screw in till it bottoms (gently). As you go thru each carb if you have a cylinder that isn't firing well it will not make a difference but the cylinder that is running will cause the engine to die when when you close it off. Aso to locate the weak cylinder on a multi cylinder bike do the spit test... spit on your fingers and then touch each head pipe, the running cylinders will burn you and the missing ones will be cooler.
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