please help!!! R in trouble!!

[yfzRRR]

i have a 2009 YFZ450R, and up until a month ago it was pefect! Bone stock, just powdercoated frame an a-arms yamaha blue, and the baffle taken out... no more than probably 50 hours on it.. i was trail riding deep in the woods and my fuel light came on, i ran out before i could get out to get gas, my buddy towed me and i put gas in it. started it up idled fine, went to take off and it just stalled, now ever since it will idle just fine but as soon as you go to take off it just boggs and stalls, it will idle pretty good and in neutral you can usually rev until the limiter but you have to push the throttle slowly to do that, if you crack the throttle it will just bog. Also backfires a little now too. so first i took the fuel pump out, and it was clean, cleaned it anyways, changed the spark plug and changed the oil, and cleaned the air filter, and put a new battery in it.. nothing different.. so i took off the throttle position sensor, cleaned that out, took off the airflow sensor and that was clean, put them back in same thing, i put fuel injector cleaner in just for shits and giggles because every yamaha dealer and mechanic i've talked to says on these new yfz's nothing will be able to get to the injector. still the same problem.. can someone please help me out with this?! if you can you'd be smarter than most of the yamaha dealers, mechanics, and yamaha's supposed "PRO" mechanics... on my last straw.. really wish i kept the 06 as a back up

[yfzRRR]

warranty ran out dec 31'st, this happened on new years day, how ironic, and i would put up pics but im new to the forum thing and i dont know how=

[yfzRRR]

oh yeah also its not throwing a check engine light

[veselym]

maybe the fuel injector failed when you ran it out of gas? I have no idea

[yfzRRR]

yeah that was originally what i thought i was but everyone i talked to said its near impossible, it seams almost like its not getting enouph gas but then you can bounce it off the rev limiter if you want, and not only for a second either, you can keep it in high revs as long as you want

[John79Lewis]

water in the gas maybe. i've bought shitty gas before and it would die when i tried to drive it. but would idle

[yfzRRR]

the gas thats in it i bought from a pretty good gas station but it could be it, i will definitely change it and see if it makes a difference, thanks!

[salvin36]

Your map sensor is what tells the ecu if the engine is under a load or not. If the bike runs fine unless under a load I would start there. I have no idea how to check it though so I cant help you there. But you could at least see if its plugged in.

[Duane]

Not sure how the newer models are set up as far as gas tanks but see if the fuel filter is clogged (if it has one) or try to run it on reserve. I know on my '05 the normal fuel setting on the tank had a mesh filter in the tank.....reserve opened it up fully bypassing the filter.

[jonnymonofrax]

I have my own broken yfz I got for cheap 3 months almost done anyway work on lots of cars and the fuel cools the fuel pump a lot of times with a car it will rev and idle fine but when driveing under load pump gets hot and failure occurs

[yfzRRR]

salvin - i dont know how to quote you but do you know where the map sensor is or what it looks like?

Duane - with the fuel injected models the fuel filter is in the pump and there is no reserve, just a fuel light

jonny - the fuel pump was my first thought because the fuel cools it and it didnt have it but i got it checked and its fine

[WickdYFZ450R]

To quote a thread more then one you hit the middle one on the bottom right then the last one you want to quote you hit the left one that say quote..

[yfzRRR]

put new gas in it, same thing, also didnt mention i always put ethanol treatment in the gas

[ctown208]

read your other thread

[yfzRRR]

Tried everything.. Is it possible I jumped time?? Bout to rip her apart and check cam positions, is it possible that this could happen on a quad so new?

[yfzRRR]

It jumped time that what was wrong