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My 1983 Kawasaki 550 Solo has been standing and only started twice in the last year now it wont start and only backfires, its getting fuel and Im starting it with jumper leads from a car battery. "hel
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possibly the ignition control module.some are a box on the firewall. mine is located on the back of the distributor. typical for no spark on fords both times i had this problem that was the fix
Go back to the 130 main jet. Be sure to check that both carb slides lift at the same moment. Also check to see if one carb is "driving" the other due to the idle screws not being balanced. Check the compression in both cylinders. It should be within 10% of each other. It is not likely that the bike has jumped time.
For a small gas engine than won't start, think FAST -- Fuel, Air, Spark, Timing. You've replaced the filters and spark plugs and squirted in some starter fluid, eliminating the simple common fuel, air, and spark problems -- but I because of the backfiring I think your problem is in the timing -- like a sticking valve. Probably more than you want to tackle at home, but might not be as expensive as an engine replacement. Take it to a good small engine mechanic -- best bet is a lawn equipment shop that has been around many years. Drive a little farther to get to one if necessary.
If the fuel is a year old, Replace all of it.Stabilizers are not restorers. Your backfiring may very well be due to the inconsistancy of the fuel. Try it and see if that gets you flying.. good luck
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