2011 KX250F electrical

Hey I am new to Thumper Talk I was wondering if anyone has had any problems with their 2011 KX250f backfiring under load? I have just did a top end rebuild weisco piston with new moose cyclinder valves are in spec bike runs strong but backfires under load and then stalls out after it is warm. I am starting to think it might be electrical maybe tps or stator I am waiting on manual to come in to start process of elimination just wondering if this year had problems with electrical any input would help thanks...

Have you replaced your fuel pump filter?

Have you cleaned your CDI pickup sensor off the stator?


Harness ?

Thanks for the fast reply! No I have not replaced fuel pump filter I will try cleaning the cdi pickup, spark plug is new. Have you heard of this issue or any known issues with the 2011 kx250f

Other than the forks being stiffer than a Viagra side effect, no. There's nothing wrong with the '11. You could also have an exhaust leak as well. The gasket at the slip-on/header joint could be worn or the header might not be fully seated into the cylinder head.

I appreciate the input I just replaced the exhaust with Yoshimura RS-4 full system. The manual arrived yesterday so I will be getting to it this weekend I will update with what I find. I checked the spark plug that the shop I previously had it said they replaced and it looks fouled probably from the low compression before rebuild. Put new plug in seems to run fine for now I will feel really dumb if thats all it was but I will be checking the whole electrical system anyways to see if something is causing the plug to foul and run like crap.

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

  • Similar Content

    • By DirtBikeHead
      2015 Kawasaki KX250f - 20 hours
      As close to new as I'd imagine you'd get! I bought the bike brand new, I'm older and have taken extremely good care of this bike. Very little use and is COMPLETELY stock - everything is original. 
      Comes with the title, original book and map couplers for the fuel injection.
      $4700 - cash 
    • By CodyR
      Just thought maybe everyone could post up there youtube channels an we could all help eachother out by subscribing to one another.
      Heres mine ill sub back asap.
    • By bangmyhead
      Time for a top end on my bike, just wondering if there are any alternative Valve springs i can use. I have PC cams and $400 for just the springs and retainers is alil costly at the moment.
      This has been fun in other sections of TT, so I'll start the thread here and see if we can keep it going.
      Let us know what kind of mods, fixes, changes, etc.., you performed today, or just general fun you had with, your KX250F.
      I'll start with.. I installed a correct for my weight Race Tech shock spring, along with a Pivot Works shock spring thrust bearing. Also cleaned out all the nasty yellow plastic/wax crap that passes for grease in the lower shock bearing, and re-lubed it with Bel Ray waterproof.
    • By MotocrossMaverick
      Hey guys i have just gotten off my Honda crf150r and i am looking for a new bike. I have been to the dealership and have already checked out the Kx250f and the Crf250r. I am looking more at the Rm-z250 then any other bike right now. I need help finding what bike would be best for me. I have never been on a 250 but i am starting racing about a month after getting the bike. I was also offered $5800 for the Kx250f and i know it killed 2012 i am just not sure about a Kawasaki. Honestly i am not sure bout any please help!!