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I purchased my first bike, a '85 GS550L, about 4 months ago and up until this last month it ran well enough to ride. It first started after I had been riding for about an hour, the engine killed in the middle of a turn. Luckily I was able to coast out of traffic, but this is when it gets strange. I tried to restart the engine, it turned over but didn't seem to ignite at all. I sat on the side of the road for 15 minutes trying anything I could think of and then... boom, starts running again. So I start heading for home... halfway there dies again, 10 minutes later, starts right up, this happens one more time before I finally make it back. I've also driven it a couple times after with the same problem and with the restart wait time getting longer.
So I've been slowly eliminating the possible problems. When the bike is cold all the plugs fire, but once it dies after letting it run for a while none of them fire. I believe the plugs and the coils are fine. What I've read so far is that the igniter may be to blame, but since they are a little expensive I wanted to make sure first. I've tried the igniter test (Remove spark plugs 1 & 2 and ground them to the motor so they will fire when they get power. With the ignitor facing you, the plug on the right side of the ignitor is where the signal generator plug fits. The two terminals on the right side of that portion of the ignitor will be pin 1 at the front and pin 2 at the back. The two left pins will be pin 3 in front and pin 4 at the back. Turn the ignition switch on. With a multitester set a the X1 ohm range put the + probe on pin 2 and the - probe on pin 1. Plug number 1 should fire. Next put the + probe on pin 4 and the - probe on pin 3. Plug number 2 should fire. If this happens the ignitor is good and the signal generators are suspect.), but even when the bike is cold and starts normally the test doesn't seem to work. I'm wondering if anyone has ever done the test and had it work, and if there are any other things I could try. Also, is there any way to refurbish an igniter if it is bad? Thanks!
So I've been slowly eliminating the possible problems. When the bike is cold all the plugs fire, but once it dies after letting it run for a while none of them fire. I believe the plugs and the coils are fine. What I've read so far is that the igniter may be to blame, but since they are a little expensive I wanted to make sure first. I've tried the igniter test (Remove spark plugs 1 & 2 and ground them to the motor so they will fire when they get power. With the ignitor facing you, the plug on the right side of the ignitor is where the signal generator plug fits. The two terminals on the right side of that portion of the ignitor will be pin 1 at the front and pin 2 at the back. The two left pins will be pin 3 in front and pin 4 at the back. Turn the ignition switch on. With a multitester set a the X1 ohm range put the + probe on pin 2 and the - probe on pin 1. Plug number 1 should fire. Next put the + probe on pin 4 and the - probe on pin 3. Plug number 2 should fire. If this happens the ignitor is good and the signal generators are suspect.), but even when the bike is cold and starts normally the test doesn't seem to work. I'm wondering if anyone has ever done the test and had it work, and if there are any other things I could try. Also, is there any way to refurbish an igniter if it is bad? Thanks!
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