S40

N

NkR03

New member
Wanted to hey to everybody. Ive got a suzuki S40 with a backfiring problem. When I turn off the ignition it goes boom. I just wanted to know if anybody else is having the same problem regardless of type of bike. I was thinking of maybe changing exhaust but I dont know what to change it to if possible.Any help would be helpfull.:bluethum:
 
I had an S40 too; backfires right out of the crate. Set up from the factory that way. There are S40 forums on the net that have addressed this completely. I also used to pull the choke out before shutting it off; but it still backfires when you let off the throttle on the highway.

Look at suzukisavage.com suzuki savage
 
yep same thing happened to mine when I had one. even after carb adjustments....thats just the way that huge single is.
 
It's the nature of the beast [ and emissions{. I wouldn't suggest pulling the choke out when you shut down. That will only give your cylinders and rings a good dousing of gasoline. You want your rings to have lubrication when you start up and all that gas just washes it all off. The same goes for revving up your engine then turning off the ignition. All that does is wash off the oil on your pistons and cylinder. Just shut it off and live with the backfire. :)
 
the backfire is not a design bug, it is a FEATURE!

ever want to make certain the woman in the cage next to you knows you are there? the wimpy horn won't be heard over her radio, but pull in the clutch briefly and roll off the throttle! instant wakeup!
 
Brand new 2007 S40. Met three other a few weeks later. Everyone has back fire. During my 1st mtce I had the tech check out the idling. I din't like the way it performed. I couldn't get the rev's where I wanted with just adjusting the idling screw. The tech adjusted the air mixture. Runs great. I had plenty of backfires especially when downshifting too quickly. I found that if I have to downshift quickly I hold in the clutch a little longer and then re-release it. No more backfire. As for when I'm stoped. Very little. I usually let the bike settle down a bit into it's own before shutting it off (few seconds). It's a big single thumper...lots for it to emission. I also avoid moving in a backward fashion when stopped and shutting it off to permit the emission to escape. But every now and then I get a little one...but I mean little. I'm confident that fuel/air mixture is key....

Take Care,

Denis
 
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