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carburetor back fire

  • Thread starter Thread starter Anonymous
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Anonymous

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I've got a GS450. The number two cylinder occasionally back fires back through the carburetor. I also noticed upon first starting the bike the exhuast heats up faster on the right side. Is this just a matter of synching the carbs? Checking the output of the coils? Checking the valves? All of the above?

Thanks
Mike
 
Carb sync is a good bet. Also, I can't remember how it works but the valves on these tighten up with wear, so they open earlier as the bike ages. You will see what I mean the first time you adjust the valves. Sounds like your thinking is right, that lit up air/fuel shouldn't be getting back through the carb.
 
Thanks Midnightrider. I just needed someone to back me up on my thinking. I would rather do a carb synch than tearing into the engine or carburetors.
 
One particular thing with the # 2 carb. The vacuum for the petcock comes from there. Also I would check the fuel level in the float bowls by replacing the drain with a fitting, and putting a transparent tube on it. Wrong float level can really mess up a cylinder.
 
yeah make sure your carbs are clean and synced. my bike did it for a while then i raised the needle a half step because the bike was running a tad rich in the mid, now it very rarely back fires through the carbs.

-ryan
 
sounds like you should check and set your float bowl levals and sync the carbs to each other also you should check your valve clearances and ur coil/timing
 
Before a carb synch, you should always be sure the valve clearances and ignition timing are correct.
 
Re: carburetor back fire

Termic said:
I've got a GS450. The number two cylinder occasionally back fires back through the carburetor. I also noticed upon first starting the bike the exhuast heats up faster on the right side. Is this just a matter of synching the carbs? Checking the output of the coils? Checking the valves? All of the above?

Thanks
Mike
Click to expand...

Sounds like a lean condition or you got erratic timing.
 
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