Question about 2000 Yamaha YZF-R6

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Bike only runs when choke is on

My bike will only run when the choke is half or all the way engaged. What is causing this???

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  • prestonj1977 May 09, 2009

    Okay, but what worries me is that I will have to adjust the pilot screw and possible sync the carbs --- is that going to happen by cleaning or replacing parts such as needle jet, needle valve, and carb jets? Syncing the carbs does not sound so bad if you have the vacuum presure gage but adjusting the pilot screw sounds like it would be tough.

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The carb jets are partially clogged and you need to clean the carb on the inside and out.

Posted on May 09, 2009

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Bike wont run when choke is at half way setting


Sounds a lot like fouled fuel jets in your carb; you may have a little work to do.
If the jets do not allow sufficient fuel to pass, using the choke can 'cheat' the carburetor by restricting the flow of air and restoring the fuel-air ratio. You can't ignore this problem since the 'cheated' condition does not let the engine develop the power for which it was designed.    

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