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carb issues

This is a discussion on carb issues within the Yamaha YFZ450/450R (2004-Present) forums, part of the Performance /Technical category; took my carb off my 06 yfz to clean it because it was cuting out a little. cleaned it put it back on and now ...


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Old 12-03-2009, 12:53 AM   #1
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took my carb off my 06 yfz to clean it because it was cuting out a little.
cleaned it put it back on and now it wont run at low rmps. it'll start rev up to about 3000rpm and then die. i moved the needle up one notch (clip 3) so i could trun my idle screw out a little(it was all the way in)
i'm runing 45p 162m 3 1/4 on the fuel/air screw and it ws a little rich last time i checked
mods are baffle out, not airbox lid, and the oil mod.
any idea why it wont run in low rpms?
i tinkered with it tonight but i haven't tried it since.
after i cleaned it i took it for a ride and it cut out even worse then before
thanks in advance

Rev
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Old 12-03-2009, 08:21 AM   #2
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im guessing something is wrong, either a o ring has moved, a gasket shifted somewhere, maybe one of the boots arent on all the way... something...

either that or you actually jammed something in one of the jets, which would be hard i think...


you didnt use carb cleaner to clean it did you?


did you take the slide out?
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Old 12-03-2009, 08:33 AM   #3
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[quote=leveldrummer;799203]
you didnt use carb cleaner to clean it did you?
[quote]

whats wrong with carb cleaner?
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Old 12-03-2009, 12:21 PM   #4
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[quote=bomber315;799204][quote=leveldrummer;799203]
you didnt use carb cleaner to clean it did you?
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whats wrong with carb cleaner?
from my understanding, it will eat the slick coating off the slide, causing it to stick or not slide properly.
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Old 12-03-2009, 12:33 PM   #5
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It will also cause a lean condition that you will never be able to fix. Once that coating is gone, that slide is wasted, and BikeBandit wants over $200 for a new one.
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Old 12-03-2009, 06:26 PM   #6
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no i just used gas to clean it
thats what i thought but i tried again and same thing...so i tried it yet again and i have yet to see if it changed
the jets are not clogged
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Old 12-03-2009, 11:30 PM   #7
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Quote: Originally Posted by Rev06 View Post
no i just used gas to clean it
thats what i thought but i tried again and same thing...so i tried it yet again and i have yet to see if it changed
the jets are not clogged

did you take the slide out? it will go in upside down and make the bike run shitty, not saying this is the problem, but its possible, another thing to try is when you get the bike running, spray around the carb and intake boots with some starter fluid, if the rpm's sky rocket, then you know you have an air leak.
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Old 12-04-2009, 01:27 AM   #8
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i tecked the slide to make sure it was in right and i'm pretty sure i dont have an air leak
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Old 12-04-2009, 02:45 AM   #9
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the hole in the slide goes to the bottom.
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Old 12-05-2009, 03:27 PM   #10
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i had that plate that goes with the slide upside down but it didn't fix anything
i moved the needle back to the 2nd spot because when i checked the plug it was black as night and then some.
any other ideas...when i drove it it would run just fine if i feathered the throttle but if i tried to go at a steady pace it would come realy realy close to dieing then come back up. and it would bog down every 7-10 seconds and it still wont idle at all.
seems to me like the fuel isn't coming into the bowl fast enough. what would cause that? the floats seemed ok
when i took the main jet out it was hard to get out, felt like it was sticking but then it would jet get lose after a few turns and the treads are fine...so that screws into the tube that the needle rides in. is it posable that that tube it bent or something?
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Old 12-06-2009, 12:53 AM   #11
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found out that my throttle position sensor is out...but the happened while trying to fix the carb problem
think maybe its electrical?
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Old 12-06-2009, 01:31 AM   #12
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could be a safety, but if your carb isnt getting fuel fast enough (which is doesnt really sound like to me) it could be the needle valve, its under the float...

if you think its electrical, get your hands on a repair manual and a multi meter, start testing things and checking to see what the voltages are supposed to be.
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Old 12-06-2009, 03:01 AM   #13
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you can disconnect the TPS and see if it makes a difference. All it does it tell the CDI how much to advance or retard the timing. Honestly, I have ran mine both connected and disconnected and found no difference in power gains.
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Old 12-06-2009, 12:36 PM   #14
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yea i did disconnect it
it was wierd my friend tps went out last week
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