Question about 2005 Buell Blast

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My 2003 Buell Blast 500cc has a problem with idling...I cleaned the ENTIRE carb and the jets also checked ALL hoses going to and from the engine and the carb, checked the spark plug, cleaned the gas, check the top cylinder, put a little bit of fuell cleaner in the gas tank. Bike starts great after it has sat for a few hours, will idle fine and drive fine, but after driving maybe an hour or so, Ill shut the bike off and try turning it back over and in order for it to start up, I need to spray a small quick dab of engine starter fluid and then it will start but will not idel, I need to keep throttling the engine in order for it to stay on......HOW CAN I FIX THIS IDLING PROBLEM or at least try to diagnose it??

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  • Tyler Lavigne
    Tyler Lavigne May 10, 2010

    I have checked the ENTIRE CARB, inside and out and sprayed it squeeky clean with carb cleaner, jets are fine and inside the jets, clean and YES I can see through the tiny holes of the jets, I need more of a detailed answer being I have been working on this bike for a month now and my mechanic cannot find the issue either, so the only thing i can think of is to clean the carb again but im starting to think thats pointless hoping doing that being I know its clean

  • Tyler Lavigne
    Tyler Lavigne May 10, 2010

    Thats not a problem.......already checked it!!!!!!!!!!

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See the Blast has an automatic enrichener, sounds like it may be the issue and/or check the intake boot between carb and cylinder head for leakage.

Best bet would be to post this to the Buell Forum at www.BadWeatherBikers.com, specifically the Buell Blast Forum aka "Thumper Forum" there.

Posted on May 17, 2010

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Check your valve clearances.

your engine sounds like its losing compression after a heat soak.

Posted on May 10, 2010

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  • john andrew manchook May 10, 2010

    Ok. You have been thoroughly through the carb. The jets are clean. Your bike idles cold so the carb gets ruled out.



    You can spray a shot of wd40 at all the mating surfaces of the boot and recheck to see if there is significant change. Or just spray the boot after the bike fails to idle and see if acts differently.



    Staying with the heat soak issue. How about the ignition?

    Perhaps you CDI unit is having problems once its heated up.

    That or its trigger.



    Considering all you have done so far it might be time to look away from the intake and check your ignition for timing changes or just low speed shorting. A timing light, a spark tester and your Buell

    service manual should be all you need to perform this test.



    thanks,

    John

















  • john andrew manchook May 10, 2010

    Pulled these from a Buell forum.....



    1. Clogged/crimped fuel tank vent hose


    2. Air leaks on rubber boot from carb to manifold. This is a common Blast problem, I keep a spare boot in my garage, they are about $10.


    3. Ignition. At about 9000 miles, I had to replace the ignition module and sensor. About $250 for part and labor. I'm pretty handy, but when it gets electrical, I let the pros do it.



    I didn't think of the vent hose since this usually kills the motor after a few miles of riding. But if you had the cover off the tank its worth checking.



    John

  • john andrew manchook May 10, 2010

    I have one more issue for this bike....and sadly enough it involves the carb!



    When you get the hot no idle condition....just crank the bike and bit and see if it smells fuely. You can also check the plug to see if its soaked with fuel. Dont use ether to start it. Just crank it and look at the plug.



    John

  • john andrew manchook May 11, 2010

    Sorry. I put up a whole bunch of things for you to check out and today I don't see them here!



    You should check your carb to see if its dumping fuel after the bike warms up. You could crank the bike after it stops idling and then pull the spark plug and see if its fuel soaked.



    You should also check for a leaky intake boot. Spray it with a little WD40 and see if the motor starts.



    You might also consider a weak/failing ignition module. The engine may need to be turning pretty fast to have enough juice to keep making spark.



    You also need to rule out a plugged fuel vent tube.



    Sorry about the posting issue. I don't know how that happened.

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Hi,
Did you clean the jets so that you could see through them? Also have you checked the vacuum diaphragm? You get to it by taking off the top of the carb? It should be sealed and not leaking. could be the carb boot as well. Once I have more information I will try and assist you further
Thank you,
Lee

Posted on May 10, 2010

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Posted on Jan 02, 2017

ckoira57
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SOURCE: my 2003 Buell Blast 500cc

Try screwing air mixture screw in to stop, then back out 1.5 turns, try every 1/4 turns. If no joy, try one size larger #pilot jet as bike may flood when throttling down when engine stopping. Is coil earth wires really tight and is plug correct range. Try Iridium equivalent of the plugs you have now...I have a '90 DR650 single Suzuki (kickstart only) and this saved my ....!!!
I also discovered a small crack in my inlet manifold twice caused the same symptoms, check it is not OVER tightened or has poorly balanced tightness causing it to warp.
Goodluck, Cheers.

Posted on May 10, 2010

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Aug 18, 2011 | 2001 Buell Blast

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Jul 16, 2010 | 2003 Buell Blast

1 Answer

My 2003 Buell Blast 500cc has a problem with idling...I cleaned the ENTIRE carb and the jets also checked ALL hoses going to and from the engine and the carb, checked the spark plug, cleaned the gas, check...


Try screwing air mixture screw in to stop, then back out 1.5 turns, try every 1/4 turns. If no joy, try one size larger #pilot jet as bike may flood when throttling down when engine stopping. Is coil earth wires really tight and is plug correct range. Try Iridium equivalent of the plugs you have now...I have a '90 DR650 single Suzuki (kickstart only) and this saved my ....!!!
I also discovered a small crack in my inlet manifold twice caused the same symptoms, check it is not OVER tightened or has poorly balanced tightness causing it to warp.
Goodluck, Cheers.

May 10, 2010 | 2005 Buell Blast

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What could be wrong with a buell blast if it starts and idles fine but dosen't take any throttle. carb and jets are clean, has a new slide diaphram and intake manifold rubber coupler.


You either damaged the diaphram when you installed it. Or it is wedged in the carb so t cant raise. If you installed it backwards it will do the same thing too.

Apr 03, 2010 | 2003 Buell Blast

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