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Buell Motorcycle Forum » XBoard » Buell XBoard Archives » Archive through April 24, 2005 » Popping , Banging , Farting.......... why does this mean lean? « Previous Next »

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Scoobysnack
Posted on Sunday, April 24, 2005 - 08:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I'm running an 04 XB12S with a newly fitted Jardine, but have not taken the snorkel out or changed the air filter yet. I am intending on getting it dyno'd to see if its running lean before any further changes. Then I will hopefully change the above and add either a race ecm or TFI.

The question is .... people say if it pops, bangs or farts on closing the throttle at high rpm , it does this because it runs lean. Can somebody explain why this is true please?

I would have thought it was excess fuel igniting , and therefore mean its running rich. Can somebody in the know explain?

Thanks

J
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Wyckedflesh
Posted on Monday, April 25, 2005 - 09:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

There is alot of speculation without alot of AFV charts floating about the boards exclaiming the XB's are running lean. If you are really worried, pay the money to a dyno shop to have a run made with an A/F monitor to check and see where the bike is actually running lean. Tell them you want some roll on and highspeed roll offs as well just to check.
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Xbolt12
Posted on Monday, April 25, 2005 - 09:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I think what they mean is than because the exhaust is hotter, any unburned fuel is more likely to ignite? I believe more fuel, and less vacuum as a means of cooling the exhaust is why some of the MotoGP bikes have circuits to keep the throttles slightly open during deceleration-or so I've read.
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