V bak questions - Road Star Warrior Forum : Yamaha Star Warrior Forums

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Old 08-30-2007, 03:47 PM   #1 (permalink)
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Default V bak questions

Hey guys what would cause a lack of throttle response after installing Woody's v bak? I followed the instructions to the letter but seems I have to grip more throttle than before install, Anyone notice this? I installed a speedstar exhaust and added the vbak after noticing a lack of power, probably due to too much air so bumped the ecu to +2 to compensate (was set at -6 each) I have an 06 and the only mods I have is the speed* and v bak planning on pcIII next season, any ideas?
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Old 08-30-2007, 04:13 PM   #2 (permalink)
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Default Re: V bak questions

Check your plugs. Chances are that you are still running lean.
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Old 08-30-2007, 04:22 PM   #3 (permalink)
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Default Re: V bak questions

I have only the VBAK and I bumped the air/fuel +3 on both cylinders. Plugs look perfect. Don't know if that's causing your problem, but sounds like you're running awfully lean. VBAK + Exhaust and you should bump it even more.

Have you checked your spark plugs? Here's a chart for reference:

http://www.verrill.com/moto/sellingguide/sparkplugs/plugcolorchart.htm
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Old 08-30-2007, 04:26 PM   #4 (permalink)
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Default Re: V bak questions

Pyre, thanks for posting that chart! Great resource.
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Old 08-30-2007, 04:30 PM   #5 (permalink)
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Default Re: V bak questions

Replied to your PM, its still lean, start with the CO # that we talked about.
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Old 08-30-2007, 08:42 PM   #6 (permalink)
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Default Re: V bak questions

Thanks guys consensus lean, will bump it up tomorrow
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Old 08-31-2007, 12:37 PM   #7 (permalink)
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Default Re: V bak questions

Hey guys thanks for the tip, bumped it up to +6 throttle returning. Going for a ride tomorrow will check plugs and maybe bump some more.
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