Suzuki S40 backfire problem

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bjackm1
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Joined: Mon Apr 16, 2012 7:25 am
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My Motorcycle: 2009 Suzuki S40

Suzuki S40 backfire problem

#1 Unread post by bjackm1 »

My 2009 Suzuki S40 will not run without leaving it on full choke now. Push in the choke it dies. If I open the throttle it will try to start but will back fire. I guess I let it sit too long this winter without starting it. Will a good carb cleaning fix my problem or do I have bigger issues?

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jstark47
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Posts: 3538
Joined: Fri Feb 03, 2006 2:58 pm
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Years Riding: 16
My Motorcycle: '12 Tiger 800, '03 Trophy 1200
Location: Lumberton, NJ

Re: Suzuki S40 backfire problem

#2 Unread post by jstark47 »

Pilot circuit on the carburetor is dirty or plugged. You could try Seafoam, it's a fuel additive, if the problem isn't too bad it could clean out the varnish. Get it at an auto parts store, follow the directions on the can. It takes a little while to do it's work, it might be a couple of tankfuls of Seafoam-treated gas to get a noticeable improvement.

Otherwise, it's clean/rebuild the carb.
2003 Triumph Trophy 1200
2009 BMW F650GS (wife's)
2012 Triumph Tiger 800
2018 Yamaha XT250 (wife's)
2013 Kawasaki KLX250S

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