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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Troubleshooting (Poor Starting/Running/Handling/Ride Issues) » Archive through July 18, 2011 » Back firing.. « Previous Next »

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Pawdaddy
Posted on Friday, July 08, 2011 - 10:15 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I am new to the world of Buell. I bought a 2009 XB12XT Ulysses. The bike has a Special Ops exhaust. My concern is the back firing when down shifting. I've been told by several people this is caused by a lean condition. This could possibly damage the valves. I was also told when adding an after market exhaust to help this condition you should add a race ECM. Your helpful advice will be appreciated. I love my Buell and want her to run the best she can.
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Schwara
Posted on Friday, July 08, 2011 - 10:38 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I just went through the exact same experience. I went ahead and updated the air filter to K&N & then called up Eric Buell Racing to let them know that I needed the race ECM for my 09 Uly with custom exhaust & K&N air filter. Once I got the ECM, installed it, & did a TPS reset ... no more backfires. She sounds & runs beautifully now.
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Pawdaddy
Posted on Friday, July 08, 2011 - 10:45 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks for the reply.. Would you share on the cost for this upgrade.. Again thanks
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Schwara
Posted on Friday, July 08, 2011 - 11:10 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The ECM is not cheap ... $250 @ erikbuellracing(dot)com. The air filter wasn't too terribly bad at around $64 on BuellParts(dot)net ... also available elsewhere I'm sure. I don't honestly know if the air filter is required or not, but it came highly recommended from multiple sources as it is much better quality than stock & increases airflow & resulting HP.
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Pawdaddy
Posted on Friday, July 08, 2011 - 11:29 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Again thanks. I'll be ordering this to get her running good. Is this an easy install..
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Schwara
Posted on Friday, July 08, 2011 - 11:59 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Both upgrades can be made relatively quickly & with few tools. I changed the ECM & did the TPS reset in a Barnes & Nobles parking lot, just prior to a ride to Southern Indiana, and my wrench experience is quite limited. I'm an engineer with a computer being my primary tool. When you get the new ECM from Erik Buell Racing it has the basic instructions of what you need to do.
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Pawdaddy
Posted on Friday, July 08, 2011 - 12:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks again..Safe riding to you
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Blake
Posted on Friday, July 08, 2011 - 01:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It's not a lean condition or likely to damage your valves. It is a rich condition with reversion sucking air up into the exhaust so it has oxygen enough to ignite.

If it were a lean condition, there'd be no fuel to ignite.
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Blake
Posted on Friday, July 08, 2011 - 01:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The solution is as described though, a fuel mapping specifically tuned for the new custom exhaust tract. : )
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Froggy
Posted on Friday, July 08, 2011 - 01:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Skip the air filter, get the Erik Buell Racing Race ECM for your bike, and enjoy : )

http://www.erikbuellracing.com/store/models/xb12/x b12-preprogrammed-ecm.html

It is the best $250 you can spend on your bike.
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Mesozoic
Posted on Monday, July 18, 2011 - 02:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

You can always datalog and tune the fuel maps yourself. After 5 or so datalogging iterations, I've got maps that are perfectly matched for my setup (Drummer SS and K&N). That will likely cost you about $40 in the cable required.

I have to admit, tuning is not for everyone. For someone looking for a turn-key experience, the Erik Buell Racing ECM is probably the best bet.
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