Vstar 1300 engine surge The engine often surges at low speeds.This bike might be running to lean.What to do?

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Hi, Anonymous and the usual suspects are:
1. Extremely lean fuel mixture.
2. Dirt, rust, water, or ethanol sludge in the fuel system.
3. Sticky throttle cables.
4. Multiple carburetors not in synchronization.
5. TPS sensor out of adjustment or faulty.
6. Wrong spark plugs for the type of service.
7. Throttle bodies not in synchronization (FI)
8. Faulty O2 sensor.
9. Clogged, stuck, or faulty IAC valve.
10. Aftermarket components not compatible with ECM.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
http://www.yamahastarstryker.com/archive/index.php/t-653.html
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http://vstar1300.pbworks.com/w/file/fetch/94628933/1300VStarServiceManual.pdf
OEM parts for Yamaha
Yamaha 2009 XVS1300AY Owner Manual
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