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'83 GS450L - Sputter\muddy\nearly die during idle

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Hahaha glad she's running again! Many years ago I spent almost an hour trying to get mine to start... wore the battery down and was trying to push start as well.

After abandoning the attempts and coming back later I found the spark plug gaps were huge! It'd been running fine earlier that day...
 
:|
I guess I spoke too soon.
I was riding home today and about 15min into the ride home, I was sitting at a light, it's the SAME light it always has happened at\started at before. It slowly started to sound like it was dying, started smelling gas, and when rolling back on the throttle it would have slow response time and sound like it was struggling to rev up.

What does this sound like it is and why is it running GREAT yesterday, after riding it all around town in the evening when it's cool out and then today, on the way home, when sitting at a longgg light (i had to sit at it waiting for cars to go through then sit through another cycle again because it's a very short light and i was near the back) it starts to do this again and persist at every light on the way home?

I changed the pilot jet like suggested but it didn't seem to fix the issue. What else could it be?
 
Sounds like heat is a component of the issue. Intermittent problems like this are really tough to figure out. Sometimes you just gotta ride it till it completel fails to,figure it out.

I wonder if you cold be suffering from vapor lock? Doesn't usually happen unless it's really hot but it kinda sounds like those symptoms.

Have you tested the electrics like coils, stator, igniter, r/r, plug wires and ignition pickup?
 
brand new stator,r/r, replaced left coil and coil wire, about a month ago
 
" was riding home today and about 15min into the ride home, I was sitting at a light, it's the SAME light it always has happened at\started at before. It slowly started to sound like it was dying, started smelling gas, and when rolling back on the throttle it would have slow response time and sound like it was struggling to rev up"

Try this;find some place safe to duplicate sitting at long light stuff (mall parking lot, school lot,etc) let it idle, and when it behaves oddly, shut it off immediately and pull and inspect spark plugs (have gloves handy!). See if one plug appears fouled.
 
Good tips, and the other is if it's vapour lock (as Sci said) by a blocked fuel tank vent, try popping the fuel cap off and see if that solves it.
 
it did it again this morning on the way to work, so when I got to work I checked it out and the left side was running totally rich - it was charred all over. the right side looked like it may have been running lean cause I didn't even see chalky marks or anything. is this indication of carbs way out of sync?

the strange thing is, it doesn't always do this, I can ride around for an hour and have no problems. other times it'll do it after twenty minutes of riding and start doing it when sitting at a light

if it is, how can I solve it? I don't have a carb sync tool
 
I'd guess your left side float needle seat (or its o-ring) is worn out; who knows why it does this randomly.Could also be a non floating float, so be sure to check it. Yeah, it's carb removal time again.
 
I remember checking that when I had them apart the last several times. the floats float freely from what I could tell when I had it apart as well.

also, if the float needle seat needed replacing, that wouldn't affect the right one that was liking too lean would it?
 
Your right side is likely fine, but the left is letting too much gas in. Freely moving floats don't mean that they are controlling fuel flow- if o-ring leaks or needle seat is really worn, too much fuel will head to cylinder. This could easily foul the plug especially at idle.
 
When you get carbs off and fuel bowls too, I'd first invert them and compare the float height just in case you made an error here. Then inspect the needles and their seats for damage- obviously best to remove them- any score marks, etc? I'd replace the gasket (or o-ring) that sits at bottom of seat on general principles. In your case, I'd also test that floats actually float in gasoline to be safe.
After reassembling carbs, you can test them for overflow before reinstalling on bike by somehow hanging/holding them in their normal bike position and feeding them fuel from the tank (on prime position) or an auxillary tank.
 
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