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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Troubleshooting (Poor Starting/Running/Handling/Ride Issues) » Archive through April 26, 2010 » Idle/TPS trouble after top end rebuild on 2004 XB12R « Previous Next »

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Spike
Posted on Saturday, January 02, 2010 - 11:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
I recently rebuilt the top end (removed all carbon, rebuilt heads with new valve guide seals, honed cylinders, new rings) on my '04 XB12R and since then the bike has had trouble idling, especially when cold.

If I set the TPS to 4.6 degrees/5.1% the bike will start when cold, but the idle stumbles around 1200rpm and will occasionally stall for the first minute or so. After it's had a minute or two to warm up it will idle a little better, but up around 1500rpm. Once the bike is fully warmed up the idle will be closer to 2000rpm. If I back the idle adjustment down I can get the bike to idle at 1100-1200rpm, but doing so puts the TPS down at 2.7%-3.0%. The problem is that I cannot get the bike to start with the idle/TPS set that low. The bike will turn over and occasionally fire, but it will not start without opening the throttle slightly or turning the idle/TPS back up to 5%. At first I thought it was just a bad intake leak, but I've tried spraying the intake seals with WD-40 and carb cleaner and there was no change in the idle quality. Any suggestions?
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Livers
Posted on Saturday, January 02, 2010 - 03:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Did the gear cover come off as part of the top end overhaul? If so I'd double check the static timing. I'm assuming there were no problems with the TPS reset.
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Aptbldr
Posted on Saturday, January 02, 2010 - 03:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Intake seal leakage I experienced was only detectable fully warmed-up.

I attempted to 'tune around' bike's fuel:air running problems (before figuring THAT was issue). Those idle TPS readings would wind-up @ 3-4%.

Double-check TPS.

Did your work disturb the sensor's mount to throttle body?

(Message edited by aptbldr on January 02, 2010)
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Greg_e
Posted on Saturday, January 02, 2010 - 10:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Sensor mounting of the TPS would have to be way out if a TPS reset didn't fix it. WOuld be prudent to check and make sure it was attached solidly.
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