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Won't accelerate when hot.

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We have a 2012 450f monster. 61 hours on it. Once it has ran for about an hour, it will not accelerate when you nail the throttle. Bogs down with some back fire. Starts fine, idles well. It will accelerate slowly to about half throttle. When you nail it, it pukes. What I've done so far: new wire harness, new TPS sensor. Help!!! We love this bike (GNCC RACER). Need it to run the whole race.

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Good one.

 

The fuel filter is not serviceable.  

 

You can get them apart, however, here's an older link: 

 

http://www.thumpertalk.com/topic/1017998-2010-yz450-bogs-after-15-minutes/#entry10702600

 

A more recent post from about a month back stated he was able to get the thing disassembled without damaging any of the parts. 

 

The symptoms are right for that.  Basically, the filter becomes a flow limiter, and the system can't deliver fuel any faster.  

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You can buy a replacement filter or do as some have do and wash the current one with dawn but their cheap enough just replace it. I'm going to warn you it's a B!!!! Taking it apart, one black hose in particular, other than that it's not to bad. Take your time and crack open a beer!! It's going to be a while...

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Yep, what everybody else said. It becomes symptomatic when the fuel level gets low in the tank and therefore only the lower contaminated portion of the filter is trying to flow fuel. Just went through this on my '13. While the filter/pump assembly is not designed to be serviceable it turns out that if you are careful you can remove and clean (or replace) the filter.

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Thanks to everyone who replied. There are some very knowledgeable people on this thread. I am in the process of disassembly and cleaning. Thanks again.

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