Falling out under riding.

9 replies to this topic
  • jnabuurs

Posted December 03, 2012 - 12:46 AM


I have a YZ450F 2011 the bike sometimes falls out under load I did a reading with the diagnostic tool and it told me D61 fault code 30.
This is the lean angle sensor and it's in the ECU so I replaced the ECU and still the same problem. I checked all connections they are all oke. The problem is the bike runs great but sometimes and you never know when the engine stops, I had it on a jump face, and sometimes after a landing sometimes during acceleration it's always a surprise. Did anyone have this problem and found out what the solution is?

  • Modmotoman

Posted December 03, 2012 - 05:30 AM


does the new ECU show the same codek?

  • jnabuurs

Posted December 03, 2012 - 08:37 AM


Yes the same reading after searching I think the fuel pump stops sometimes I like to know how the ECU sees this as a faulty lean sensor.

  • grayracer513

Posted December 03, 2012 - 08:48 AM


Is the ECU mounted in the stock position, or was it relocated?

  • jnabuurs

Posted December 06, 2012 - 09:19 AM


The ECU is mounted on the original place. At the moment after measuring all components I have the feeling that the fuel pump sometimes stops and the ECU recognizes this as lean over sensor problem I will change the fuel tank to try. Thank you for thinking about this issue.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Chazmagnum

Posted December 06, 2012 - 01:00 PM


Are you sure it's not a bad kill switch?

  • jnabuurs

Posted December 06, 2012 - 01:29 PM


It could be but it's only a few month old the last time I tried the bike slowly every time I used the brakes the bike stopped during engine breaking without pulling the clutch and it most of the times stops after a jump I have a strong feeling it's in the fuel tank.

  • vic2340

Posted December 07, 2012 - 10:59 PM


Ahhhh, nothing wrong with carbs but they just had to switch them for computers. well thats what you get!! that never happened to a properly jetting carb before but mr. japanese computer pants just had to go a screw everything up and put a 10 pound fuel injection system on a dirt bike that randomly breaks. thanks yamaha, kawaski, suzuki, honda. (p.s im just messing around, no hard feelings please)

  • jnabuurs

Posted December 08, 2012 - 05:35 AM


There are a lot of components that are needed for the engine to run but only for running and not diagnostic for the ECU memory storage are the AC magneto or stator, wiring, condenser, the fuel pump, spark plug, ignition coil, rectifier/regulator, fuel pressure. Only three of them can fail accidentally AC stator, wiring, fuel pump and fuel pressure. Only two of these three can fail abruptly AC stator and wiring. I checked fuel pressure and it's OK the engine stops under 1 bar that's about 2 bar less then normal. During running I moved the wiring everywhere and no misfiring at all. I think I will replace the stator this one can fail by temperature change and can start working after seconds again and can be good while measuring and fail under load or high temperature. The bike has 160 hours and carburated bikes have these problems also sometimes.

  • jnabuurs

Posted December 16, 2012 - 01:02 AM


Yesterday tested the bike with a new stator on an indoor track until now no problem at all next time I will test on a teavy sand track if it is fine there the problem is solved.

Related Content


Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.