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I merged your 2 threads together. Sounds like a dirty carb.
 

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Dirty carb. or bad gas.....had some bad gas at one time and it would do that as well...helped fowl out my spark plug
 

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posibly running rich as well, try cleaning the carb first
 

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to clean it really well yes, but most of the time you CAN just spray it in while the bike is running, i wouldnt really reccomend it, we do usually only spray the carb cleaner into throttle bodys on trucks to clean em out. but taking it off is the right way and makes it last longer before it has to be done again
 

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my 400ex bogs too but it only does it when i am in to high of gear and nail it if i down shift 1 gear it dont bog
 

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Hi i have a 09 trx 450er its not even a week old and lasr night i went for a ride and its also boging down when i hit the gas and does this at any speed or gear
 

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All of you guys are experiencing a dirty air filter or carb. These carbs are extremely sensative to dirt even the tiniest of dirt will clog the inside of these carbs. I would suggest a good cleaning to all of them
 

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I agree. Sounds like a dirty carb.
 

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Ok i understand the carbs are extreamely sensitive to dirt and wheat ever can get in there but my 450 isnt even a week old and the air filter is a 2 day old K&N.I would hate to think that i have to take the carb appart ever week to clean it because than takes away from fun. THX
 

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Well 09trx450R your issue is you installed an after market filter my question to you is did you rejet the carb to compensate for the increase in airflow? did you remove the airbox lid? if so put it back on and try it. lastly did you put an aftermarket exhaust on? if you did not rejet chances are you are too lean you have created more airflow with the K&N leaning out the balance of air/fuel from stock. I would step up a size on the main.
 

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Ok i understand the carbs are extreamely sensitive to dirt and wheat ever can get in there but my 450 isnt even a week old and the air filter is a 2 day old K&N.I would hate to think that i have to take the carb appart ever week to clean it because than takes away from fun. THX
take it to the dealer if you dont want to mess with it......
 

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Yep my 450 did the same thing. When you stab the gas it would bog for half a second that launch. Get your machine jetted correctly. These come jetted stock for sea level.
 

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Ok after i installed the filter i did not rejet the card and the lid is on i also had run the quad for 2 days with the new filter with out asny problems at all.Everything else on the quad is stock.I think ill take it to the dealer and let them figure it out because makes no sence to me but id like to thank everyone for the help and making me feel welcome
 

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Ok after i installed the filter i did not rejet the card and the lid is on i also had run the quad for 2 days with the new filter with out asny problems at all.Everything else on the quad is stock.I think ill take it to the dealer and let them figure it out because makes no sence to me but id like to thank everyone for the help and making me feel welcome
You can save yourself alot of money by doing it yourself I would jump a couple sizes on the main jet try it with the box lid on then off see what you got.
We are glad to help you out bro that's what this forum is all about
 

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Agree, try to go up one size on the main jet, maybe 2. It is easy, on the very bottom of your carb there is a 17mm bolt. Remove that(gas will drain, so be prepared) then get a 6mm deep socket and put it up that hole that the 17mm plugged. The only thing you will be able to grab is the main jet. Remove that and change it. The needle jet holder might come out with it but not a big deal. Just swap out the jet and put it all back in there. Just finger tighten everything with the socket. These are made of brass and can break easy.
 

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Also, what elevation are you running at?
 

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Im not sure of elevation will have to check into that im just outside Barrie Ontario Canada but for what its worth i got some JP1 carb cleaner put very little in my tank as i had just under half a tank and ran the quad i hit it and it bogged down did it a second time and it ran great for 3-4 hours no bogging what so ever but i will still take your advice (Redracer and TRX2five0 and do it myself and jet but for now i just want to break it in and was thinking of getting the HRC power kit and an exhaust then jet get it all done at the same time so i dont have to rejet after every mod thanks again guys
 
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