Carburetor adjust? - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
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post #1 of 4 (permalink) Old 08-03-2010, 12:47 PM Thread Starter
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Carburetor adjust?

Hi there,

can you give me a tip how to adjust my Carburetor perfectly?

- YFZ 450 '06
- cam mod
- open airfilter
- LeoVince X3 F.I.M-Silencer
- jet: 168 and 45

How many rotations with the mixture screw?

Thanks and greetings from Germany
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post #2 of 4 (permalink) Old 08-03-2010, 02:16 PM
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To get "like" suggestions on jetting you need to include your elevation where you ride, then others with similar mods and same elevation can tell you what they have (a good starting point sometimes).Adjust Perfectly? Go to a reputable shop that has a dyno and get it dyno tuned, this is the closest to perfect.

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post #3 of 4 (permalink) Old 08-03-2010, 02:39 PM
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+1. The fuel screw should be between 1.5-2.5 turns out. If you have to turn it out more than 3 turns, go up one pilot jet size. Do you have any popping on decel? Crisp throttle response? Do you have an adjustable needle in it? What needle is in it if it is adjustable, is it the NCVQ? Do you have any bog, when you stab the throttle?

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post #4 of 4 (permalink) Old 08-13-2010, 03:02 PM
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i have a hesitation on decelleration. could that be fixed by adjusting the fuel screw. I ride trails in michigan. not exactly sure on elevation. cylinder works big bore, pro circut exaust and header. thats the big stuff.
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