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79 GS850 exhaust sputter

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I’m having a bit of a head scratcher here, new to the motorcycle world so I’m still learning. No mechanic experience. Bought the bike with a full tank of gas that the previous owner had filled it with and it ran smooth as whiskey, went to refuel it a couple of weeks later with mid grade pure non ethanol fuel. Started the bike back up and now the exhausts sputter every time I choke the start. Once the bike is running without the choke the exhaust sputter stops. What’s the issue here? Appreciate advice!
 
Nash79GS850 said:
I’m having a bit of a head scratcher here, new to the motorcycle world so I’m still learning. No mechanic experience. Bought the bike with a full tank of gas that the previous owner had filled it with and it ran smooth as whiskey, went to refuel it a couple of weeks later with mid grade pure non ethanol fuel. Started the bike back up and now the exhausts sputter every time I choke the start. Once the bike is running without the choke the exhaust sputter stops. What’s the issue here? Appreciate advice!
Click to expand...

Once the bike is fully warmed it runs and sounds proper? I don't think there's any issue at all. Stay safe and welcome to the brotherhood.
 
Sounds like you were restarting a already warm engine? Shouldn’t need choke at all in that condition. If you did apply choke when starting a warm bike, sputtering (or flooding) is what you would expect. Keep on keepin’ on.

If I run my bike every day, never need choke to start. If I let it sit a few days, I might need half choke to start.

Good on you for the non-ethanol fuel. Good for the carbs.
 
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