HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
waterhouse67

2010 YZ450F Acceleration Bog

4 posts in this topic

I have a 2010 YZ450 that has a nasty bog when getting on the throttle hard.  The bike has 85 hours on it and the bog didnt start happening until about two weeks ago.  I ride mostly on a motocross track.  The bog happens right when I need the power the most, on the face of a jump.  It feels like I am pressing the kill button.  The bike has never died, just loses all rpms.  The bike had 4 historic codes on it; atmospheric pressure sensor, throttle posistion sensor, intake air pressure sensor, and coolant temp sensor. I have replaced the stator/pick up coil and the kill button, neither of which have helped my issue. I have checked valves, all sensors, and wiring per the service manual and have not found any problem. Does anyone have any idea whats wrong with my bike? I feel like it is an electrical issue and not mechanical, as the bike always starts right up and runs great until the bike is hot. I am yet to determine if I am losing spark or fuel when the bog happens. 

Share this post


Link to post
Share on other sites

Its most likely the fuel pump, mine did the same on a jump face or when I lifted the front to get over a whoop etc

Share this post


Link to post
Share on other sites

I have had a fuel pressure guage on the bike and it has never lost pressure, it holds steady at 48 psi.  I double checked all the wiring again and found a connector that is not listed in the service manual anywhere.  It is on the right hand side rame rail on a bracket that holds the atmospheric pressure sensor.  You can access it by taking out the airbox.  The connector is a hub for all like color wires to come together.  I took the connector apart and found that I had corrosion on one of the ground wires.  I cleaned it all up, put it back together, and took it out riding.  So far I have not gotten the bog to come back.  Im hoping that fixed my issue.

Share this post


Link to post
Share on other sites

I have had a fuel pressure guage on the bike and it has never lost pressure, it holds steady at 48 psi.  I double checked all the wiring again and found a connector that is not listed in the service manual anywhere.  It is on the right hand side rame rail on a bracket that holds the atmospheric pressure sensor.  You can access it by taking out the airbox.  The connector is a hub for all like color wires to come together.  I took the connector apart and found that I had corrosion on one of the ground wires.  I cleaned it all up, put it back together, and took it out riding.  So far I have not gotten the bog to come back.  Im hoping that fixed my issue.

keep us posted. That's good info to k

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0