Question about 2005 Suzuki Boulevard S83

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WHEN STANDING, BACKFIRING IMPROVES WITH CHOKE. WHEN RIDING , WILL BACKFIRE WHEN SHIFFTING DOWN AND CLUTCH ENGAGED

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G'day,
I have a couple of suggestions for you.
Your symptom sounds like your bike is running lean(problem improves with choke).
Add that to your other symptoms & it sounds like your bike is sucking air at the inlet tract(front of carbies).
I recomend that you check that any hoses that may be fitted to your bikes inlet manifolds,arn't damaged or split.
If you find they seem fine,try running the bike,& while it's runnung,spray some WD type spray on the manifolds at the front of the carbies(use the nozzle).Be sure to spray the joint of the manifold where it bolts/is clamped to the cylinder head.
If any leaks are present,the engine speed or smoothness will change(as the WD gets sucked in through the leak & then changes the fuel mixture).
Another way to check is, using a piece of hose(about500mm long)place one end in your ear &use the other end as a probe to search for leaks while the engine is running.If there's a leak you'll hear it through the hose in your ear.
I hope that my guess is right & you should find a leak there somewhere.
I hope that this may help.
Kind regards Andrew Porrelli

Posted on May 17, 2011

Testimonial: "this is an amazing answer , I am sure it will solve my issues. thanks porrelli"

  • Yitzchak Bachar
    Yitzchak Bachar May 18, 2011

    Amazing detailed ,helpfull answer.
    Thanks Porrelli

  • Andrew Porrelli
    Andrew Porrelli May 20, 2011

    My pleasure!

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