 Jetting 101., Tutorial |
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 Jul 7 2006, 02:45 PM
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#1
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 I feel like a Cowboy losing his horse. My giddie up is gone.  Group: Lifetime YFZCentral Patron
Posts: 13908
Joined: 13-December 04
Member No.: 4052
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How to jet the carb on the YFZ.
Step 1: Drain the carb of gas.  Step 2: Unplug the TPS and carb switches to spin the carb. Unplugging is optional. You may have enough room to rotate carb without removing the plugs.  Step 3: Loosen clamps that hold the carb. One on the intake side (not shown) and one on the leaving side of the carb.  Step 4: Spin carb to access the jets by removing the 17mm nut at the bottom of the carb bowl.   Step 5: Replace jets as required. In these pics I removed the bottom of the carb to get better pics. YOU DON'T NEED TO DO THIS!  Step 6: Getting to the needle and clip. Remove the plate on top of the carb.  Under the plate you'll find an allen head screw that needs to be removed to get to the needle and clip.  Remove allen head bolt to remove the needle and clip.  Reach inside the back of the carb to "lift" the needle out.  Needle and clip.   WARNING: DO NOT MOVE THE TPS SWITCH WHILE DOING THIS!  That's my basic "jetting for dummies" tutorial. Make sure everything is clean before doing any of this because dirt is your worst enemy. After you're done make sure everything is put back in place and all switches are plugged in. EDIT: This is what you'll see on the 06-07 YFZ's when it comes to the fuel screw access. Thanks to Fever2ride for providing the pics. Yamaha blocked off the access with a plug and you can either pop the plug out by screwing in a sheetmetal screw or take the bowl off and punch it out from the inside.    
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Jul 7 2006, 02:45 PM
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Jul 15 2006, 07:09 PM
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#2
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 Pimpin' Ain't Easy Group: Members
Posts: 3207
Joined: 11-September 05
From: long island,NY (sucks)
Member No.: 6735
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Is the TPS the thing the pen is on? (I think thats the idle) Or is the where the arrow is? Im confused!
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Jul 15 2006, 07:18 PM
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#3
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 YFZ450 Racer Group: Members
Posts: 1121
Joined: 7-June 05
From: Star Prairie, Wisconsin
Member No.: 5894
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QUOTE(chaos @ Jul 15 2006, 10:09 PM) Is the TPS the thing the pen is on? (I think thats the idle) Or is the where the arrow is? Im confused! [right][snapback]454970[/snapback][/right] The TPS is what the arrow is pointing to. The pen is pointing towards the idle screw. Good tutorial for the beginners. 
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Jul 15 2006, 07:20 PM
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#4
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 Captain Obvious Group: Members
Posts: 4741
Joined: 16-August 04
From: Australia
Member No.: 3070
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another good one
you can also blip the throttle when you want to remove the needle, this will save you taking the airbox off, but you will need to sharpen up on your ninja skills to catch it in time, and it is twice as hard with fat fingers 
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Jul 15 2006, 08:08 PM
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#5
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I feel like a Cowboy losing his horse. My giddie up is gone. Group: Lifetime YFZCentral Patron
Posts: 13908
Joined: 13-December 04
Member No.: 4052
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Chaos
Unplug the TPS and see how your quad runs....unless you determine which thing your "buddy"  moved to adjust the idle.
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Jul 18 2006, 05:03 AM
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#6
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Pimpin' Ain't Easy Group: Members
Posts: 3207
Joined: 11-September 05
From: long island,NY (sucks)
Member No.: 6735
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Ookie dokie.. I never said he only touched the idle
 This post has been edited by chaos: Jul 18 2006, 05:04 AM |
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Jul 29 2006, 08:06 AM
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#7
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YFZ450 Racer Group: Members
Posts: 92
Joined: 22-September 04
From: Seattle, WA
Member No.: 3354
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What happens if the TPS gets spun a little, and how can i tell if it did?
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Aug 5 2006, 11:31 AM
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#8
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 YFZ450 Racer Group: Members
Posts: 162
Joined: 4-January 06
Member No.: 7972
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Best to mark tps with a scratch to case, if it moves you will know.
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Aug 15 2006, 11:28 AM
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#9
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 YFZ450 Racer Group: Members
Posts: 52
Joined: 18-May 06
From: Cali
Member No.: 9695
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I have an 06....I pulled out the needle to change the clip setting, but there is only 1 notch. I has NGN R stamped on it. |
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Aug 15 2006, 01:19 PM
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#10
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I feel like a Cowboy losing his horse. My giddie up is gone. Group: Lifetime YFZCentral Patron
Posts: 13908
Joined: 13-December 04
Member No.: 4052
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Most of the 06s' come with a non-adjustable needle........you would need to order a NCVQ needle froman 04 YZ450 dirt bike or a stock needle for the 04-05 YFZ to have any adjustments.
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Aug 15 2006, 03:01 PM
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#11
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YFZ450 Racer Group: Members
Posts: 52
Joined: 18-May 06
From: Cali
Member No.: 9695
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QUOTE(YFZ450alterego @ Aug 15 2006, 02:19 PM) Most of the 06s' come with a non-adjustable needle........you would need to order a NCVQ needle froman 04 YZ450 dirt bike or a stock needle for the 04-05 YFZ to have any adjustments. [right][snapback]470086[/snapback][/right] Thanks! I just put in a 168main and 45 pilot....seems to be running ok. I adjusted the idle up and it seemed to get rid of the bogging. I was just frustrated when I finally got the needle out to see that I couldnt do anything with it. |
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Aug 15 2006, 03:03 PM
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#12
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I feel like a Cowboy losing his horse. My giddie up is gone. Group: Lifetime YFZCentral Patron
Posts: 13908
Joined: 13-December 04
Member No.: 4052
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Well if you find you have issues in the mid range you know what needle to get......
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Sep 30 2006, 10:09 PM
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#13
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 YFZ450 Racer Group: Members
Posts: 978
Joined: 3-August 06
From: Texas
Member No.: 10780
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ok, i hope someone can help me, i did a cam mod and rode it and evrything was great, them i removed the vaccum housing on the subframe and the it idled ok then i put it up and t wo days later, it sucks, mid range and upper throttle, nothing there falls on its face like its starving for gas or to fat. if i mess with the tps sensor or unplug and plug it back in or even bump it, will it do that and i f so can i fix it?
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Oct 1 2006, 02:15 AM
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#14
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YFZ450 Racer Group: Members
Posts: 128
Joined: 18-June 05
From: Washington
Member No.: 6010
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so Ego.......for those of us that havent done he leak jet yet, where is that at? i havent gone looking for it yet. i was just going to get the 35 and figure out what it looked like and find it in the carb
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Oct 1 2006, 06:21 AM
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#15
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I feel like a Cowboy losing his horse. My giddie up is gone. Group: Lifetime YFZCentral Patron
Posts: 13908
Joined: 13-December 04
Member No.: 4052
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jdthomas24.....it may not be a jetting problem you're encountering. Is the battery fully charged? What year YFZ is it?
hotrodchev4x4...if I'm not mistaken the leak jet is mounted in the float bowl. I've never touched mine and luckily don't have the infamous bog that alot of people encounter.
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Nov 9 2006, 08:53 PM
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#16
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 Ride Or Die Group: Members
Posts: 827
Joined: 15-September 03
From: Glendale, AZ
Member No.: 498
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ok uh...mine doesnt have the mixture screw knob. its just a hole. what do i do?
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Nov 10 2006, 03:30 AM
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#17
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I feel like a Cowboy losing his horse. My giddie up is gone. Group: Lifetime YFZCentral Patron
Posts: 13908
Joined: 13-December 04
Member No.: 4052
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QUOTE(Mustache Ride @ Nov 9 2006, 11:53 PM) [snapback]503825[/snapback] ok uh...mine doesnt have the mixture screw knob. its just a hole. what do i do?  Do you remember posting that smiley in a reply somewhere...kinda sucks asking a legitimate question and someone's a smartass isn't it. Food for thought. 
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Nov 22 2006, 03:41 PM
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#18
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 YFZ450 Racer Group: Members
Posts: 350
Joined: 15-February 06
Member No.: 8531
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wats the best way to get the top of the carb to the needle it just seems for tight in there i cant get my allen wrech in there to loosen it???
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Nov 22 2006, 04:00 PM
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#19
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I feel like a Cowboy losing his horse. My giddie up is gone. Group: Lifetime YFZCentral Patron
Posts: 13908
Joined: 13-December 04
Member No.: 4052
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QUOTE(PitJumper06 @ Nov 22 2006, 06:41 PM) [snapback]508580[/snapback] wats the best way to get the top of the carb to the needle it just seems for tight in there i cant get my allen wrech in there to loosen it??? Is the carb spun? Spinning the carb is the easiest way. |
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Nov 22 2006, 04:36 PM
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#20
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YFZ450 Racer Group: Members
Posts: 350
Joined: 15-February 06
Member No.: 8531
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ya its spun but how far should it be spun cause i only have it spun so far cause its hiiting on other things that are tricky to get to also
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