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post #1 of (permalink) Old 12-19-2005, 12:00 PM
fishingtk
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YFZ carb issues

OK, I have a 2005 YFZ 450. It spits and sputters when held at any constant throttle. It does not matter if is at the top or bottom end. I have changed the jet kit many times, adjusted the Zip-Ty fuel screw, at least 50 times. I can not figure it out. My only other thoughts were maybe the CDI or the Throttle Position Sensor. I guess I should mention that I added a Pro-Flow air intake and a K&N; and also a HMF full exhaust. I love this quad, but it isn't worth the dirt it sits on, if it isn't running correctly! Any suggestions would be greatly appreciated!!!
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post #2 of (permalink) Old 12-20-2005, 12:40 AM
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Re: YFZ carb issues

How long ya been running the K&N?
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post #3 of (permalink) Old 12-21-2005, 12:40 AM
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Re: YFZ carb issues

Since I bought the quad new.
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post #4 of (permalink) Old 12-21-2005, 09:19 PM
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Re: YFZ carb issues

The reason I ask is that often the K&N filters, which are heavily oiled from the box, cause restriction for a while until the excess oil gets sucked through. That equates to a nightmare when setting up a jet kit that's being installed simultaneously. The setup which makes it run "right" with the restriction is going to run lean once the filter oil equilibrates. Also, I don't know what kit you have, but sometimes they come with different jets to use in conjunction with intake and exhaust mods. Now that the quad has been ran some, try going back to the base settings according to the instructions with the kit and see how it does. Also, you are correct, it is possible that the TPS is out of whack. I really don't think that you have CDI problems, since it would likely act the same regardless of throttle. But in order to troubleshoot the problem, start with the basic things, go one step at a time, until ya got it. Set the kit back to base and work your way forward. Let us know. Good luck! [img]/ubbthreads/images/graemlins/cool.gif[/img]
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