Question about 2005 Buell Firebolt XB12R

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When I get on the throttle I hear a metal rattle sound

Bought the bike used, all stock with the exception of after market exhaust. When I get on the throttle no matter what gear I'm in, I hear a metal rattle sound. It's very faint and difficult at this point to narrow down. I sounds something like if yo were to put a ring onto a metal rod that was just barely smaller than the ring and shake the rod while the ring rattled. Just curious on what it might be or how to narrow it down and fix it before the small problem becomes big. Thanks

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This sounds like pre-ignition, aka detonation and engine knock. Change to premium gas and put in a set of spark plugs that are one heat range colder than stock. It is good that you are handling this before the engine destroys itself. Yes, destroys itself. That is what pre-ignition will do. By the way, good description!

Please rate this answer. Thanks Dan!

Posted on Apr 20, 2009

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SOURCE: When I get on the throttle I hear a rattle sound

i would guess by the sound of that that the fueling is all up the ***,,the sound you are hearing is commonly known as pinking which is caused by an overly lean combustion mix,the fuel is actually igniting before the sparkplug fires(it ignites just by the build up of heat in the cylinder)get the reason the fuel mix is so lean is you guessed it (the aftermarket pipe),get the bike into the agent and get the fuelling sorted before it starts burning holes through the piston(and it wont be a matter of if it will be when)hope this helps

Posted on Jul 06, 2009

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