AlexW
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SuzukiSavage.com Rocks!
Posts: 57
Durham, NC
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Hi! New S40 rider here. Also largely mechanical newb.
Bike is a 2012 model, 7400 miles (bought at 7100 or so 2 months back). No modifications. In the Piedmont of North Carolina (400ft), so currently a few degrees above freezing most mornings.
Since getting the bike, I've had an on-and-off issue of it stalling when I dethrottle to idle. Always starts just fine with the choke in the morning, warms up and idles fine.
Some days, that's it - runs beautifully. Some rides, too - even after a bad day - runs beautifully. Most days and most rides, though, I'll get anywhere from one to three stops down the road and when I dethrottle to stop, the engine idles down too far, stumbles and stalls. Sometimes, but not always, there will be a smell of unburned gas while riding, and it will always stall at the next idle when this is the case (too rich mixture?)
When this happens, gas will leak out the carb overflow for a minute or two afterwards. The engine will start again without choke if I roll the throttle on about 1/4 OR run the starter for 6-7 seconds, then will usually idle high for a minute then be ok. But then, two stops down the road, it's stalled again and dribbling gas. At present, will start without choke or throttle, but will begin leaking gas from the carb overflow as long as the engine is idling.
Given the carb overflow gas leak, presumably the carb is getting flooded. However, turning the petcock to PRIME either before, during or after a stall does not cause any change in the behavior - a stuck float valve would be the obvious culprit, except I'd expect a stuck valve to leak with the petcock on prime...
I have also tried adjusting the idle speed, which seems to make no difference. Tapping the carb with a rubber hammer doesn't help.
The dealership it was bought from have taken it back in twice. First time they stripped, cleaned and reassembled the carb, and the bike ran fine for them for 3-4 miles, but stalled within 200 feet of my house when they brought it back. Second time, they put 15 miles on it without being able to replicate the problem, so I think they just gave it back to me without doing anything (annoying, of course, that one of it's "running like a dream" journeys would be when the tech was riding it...). It's going in a third time for 7500-mile service in a few days, and I'd love to give them some clear pointers on specific things to check, or things I can try in the meantime.
Any ideas?
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