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GS450 - Idles but can't give it any gas

  • Thread starter Thread starter tthayer
  • Start date Start date
Swapping the coils from one side to the other actually did make it run worse, but still no change. I'll see if I can find some good used ones from one of the bike shops nearby.
 
tthayer - I am not a guru like the rest of these guys but I can say I just had this exact issue. I mean your post reads my issue to a tee. I followed Nessisms guide and cleaned the carbs properly and the problems gone. Just thought I'd throw that out there.
 
I thought I had, but I suspect the carb dip I used was already depleted. I'll go through it again now that I have a can of carb cleaner handy.
 
OK, big progress was made today. I think the right-side intake boot wasn't sealing properly. I took it off and took a file to the mating surface and cleaned out the channel for the ring and the bike now runs and revs BUT BUT BUT only with the tank set to prime. It runs great but there is fuel pouring out of the drain on the airbox so I think that is probably going to harm my mileage a little bit. The bike runs for a short period with the tank set to reserve or on (with several gallons of fuel in the tank), but it won't stay on for more than a few seconds that way. I think there might be something preventing the carbs from creating enough vacuum to force the petcock to open or the petcock is faulty. Any ideas?
 
I'm going to make a wild leap here and guess that one or both of my floats aren't working, which is why I'm getting fuel out of the airbox. As previously mentioned: I've checked the float heights and replaced the o-rings for the fuel inlet.
 
Needle valve? I'm still a noob but I think if the floats aren't working that means they are filling up with fuel causing the needle valve to stay open, therefore causing overflow. But i'm pretty sure that overflow would come out of the overflow lines and not the airbox.
 
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I'm starting to think that I'm an idiot of all things mechanical.
I think I have the overflow lines plugged into the vacuum port on the petcock and the ****** ************ ******* ********* *** ******* overflow plugged into the *** ***** ** **** vacuum port for the petcock.

**Edit for clarity**
Basically the fuel overflow is pushing against the petcock, preventing it from opening when in run or reserve. The overflow is blocked and fuel backs up over the floats and into the intakes. So very disappointed that I can't run out and fix it right now. Damn the darkness.
 
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tthayer said:
I'm starting to think that I'm an idiot of all things mechanical.
I think I have the overflow lines plugged into the vacuum port on the petcock and the ****** ************ ******* ********* *** ******* overflow plugged into the *** ***** ** **** vacuum port for the petcock.

**Edit for clarity**
Basically the fuel overflow is pushing against the petcock, preventing it from opening when in run or reserve. The overflow is blocked and fuel backs up over the floats and into the intakes. So very disappointed that I can't run out and fix it right now. Damn the darkness.
Click to expand...

That would certainly do it. Your vacuum nipple? should be just about directly below the petcock off the side of carb #1. If it's coming from anywhere else it's more than likely wrong.
Hope this helps some.
 
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The petcock is brand new, and the vacuum nipple is on the right-hand carb. The carbs on this bike more resemble the BS36's in Nessisim'. tutorial than the BS34's I've seen in most of the other write-ups (including the Clymer manual).
 
tthayer said:
The petcock is brand new, and the vacuum nipple is on the right-hand carb. The carbs on this bike more resemble the BS36's in Nessisim'. tutorial than the BS34's I've seen in most of the other write-ups (including the Clymer manual).
Click to expand...

It's not down in front of the choke lever? Looking at your pictures your carbs look a lot like mine and the nip should be on the left under the petcock. I could probably put my thumb on the petcock and my pinky on the carb nip, that's how close they are.
Check picture 149 in your photobucket. Directly above the choke lever as it sits there.
 
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Photobucket? Am I missing something? I don't see a link anywhere in this thread... I'd like to see too... :rolleyes:
 
Forgot to add my bike to my signature. The bike is running great now. I can't believe I didn't realize the hoses were reversed to begin with, but I did learn an awful lot about the carbs in the process. Everything is clean as whistling now.
 
rlong74 said:
Oops,I was looking at Pete's pictures:rolleyes: what year is yours?
Click to expand...

Haha all good, now it all makes sense :D

Just to answer the question, the lever actuated choke is because the scrambler pipe being made by Tranzac at the moment will be in the way of the choke lever, and I've always wanted it on the 'bar rather than the carbs too.
 
pete said:
Haha all good, now it all makes sense :D

Just to answer the question, the lever actuated choke is because the scrambler pipe being made by Tranzac at the moment will be in the way of the choke lever, and I've always wanted it on the 'bar rather than the carbs too.
Click to expand...
Looking at your pics and him telling me his vacuum hooked up on #2 I was thinking "holy cow this guy's got his carbs on backwards and his choke and throttle mixed up:eek:" as I see obviously not the case.
 
rlong74 said:
Looking at your pics and him telling me his vacuum hooked up on #2 I was thinking "holy cow this guy's got his carbs on backwards and his choke and throttle mixed up:eek:" as I see obviously not the case.
Click to expand...

You did help me quite a bit, despite the confusion :D

You mentioned the overflow tubes and I thought to myself, "there aren't overflow tubes on my carbs! Oooh, wait a minute. *5 minutes of cursing*"
 
Mate that's awesome you got it running :D

I'm undecided what to do with my overflows yet, no airbox for them to route to so I'll have to think of something...
 
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