Question about Suzuki Boulevard C90T Motorcycles

1 Answer

Temporary loss of power and backfiring

My C90T generally runs very well. Occasionally I experience temporary loss of power for a few seconds. It then backfires and resumes full performance. I took it back to the dealer and they cleaned some or other contacts but the problem persists. Because it is so sporadic it is difficult for the dealer to determine the problem. I would appreciate any advice. Could it be a dirty fuel filter (assuming these bikes have one)? Thank you.

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  • Andrew Smith May 22, 2013

    Thank you for your advice Michael - will get that checked out.

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The problem is more likely to be ignition related. And yes, they do have a fuel filter. Usually in the fuel tap, but sometimes in the fuel line as well. Fuel starvation would not cause the symptoms as you describe them. A misfire would, you would get unburned fuel in the exhaust and it would then be ignited by the next fire stroke going into the exhaust. The fault could be something as simple as a failing spark plug or lead.

Posted on May 10, 2013

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SOURCE: Save our bonneville

sounds like the throttle cables need to be looked over .( he get everything back to where it was before the lubing?)as one may be out of sync with the other. the oil change has NOTHING to do with the sputtering and surging ,stall .it would only apply if the clutch was slipping and that would make the bike rev with the car oil.

Posted on Nov 10, 2008

  • 12 Answers

SOURCE: backfiring atomik 125cc running rough.

What octane gas are you using? If octane is to high even with mixed fuel it will cause valves to burn out run to rich....try using lower octane gas, if not you need to adjust fuel mixure...only ned a small screwdriver for this....but try the fuel first...

Posted on Jun 22, 2009

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SOURCE: Bike is backfiring through carb.

do u have the correct spark plug the one recommended by the manufacturer

Posted on Aug 02, 2009

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SOURCE: Backfiring through rear cylinder, 45000 on bike

A sticking intake valve or weak valve spring may also cause this problem. Check the intake manifold connection for tightness. Try another spark plug.

Posted on Oct 23, 2009

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robotek
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SOURCE: 350 raptor only runs with full choke on ,

Hi Mike,
You will find that there is a problem with the carbie. It runs with the choke on because the choke engages the "enricher" circuit. The idle circuit is different a different circuit inside the carb. When just crack the throttle on, you use the pilot circuit, and then main jet with more twist of the grip. You will need to completely strip the carb, remove all jets, spray carbie cleaner throughout, and blow out all capillary tubes and holes inside the carb with compressed air. Pay particular attention to the fine holes inside the venturi near the butterfly valve. You may need to use a fine piece of wire, like a guitar string to open up any that are clogged.
There is not much else that will cause the symptoms you have. Check for air leaks about the inlet manifold also, spray some carbie cleaner about the manifold connections boots, the revs will change when it sucks up the cleaner through the leak.
Happy to talk to you more about it.
regards robotek

Posted on Jan 24, 2010

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