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Hi all, I have a Yamaha yzf125 2008 fuel injected. Starts and runs fine. When go above 5k revs the engine light flashes then cuts out. Starts straight back up. Thought may be a fuel pump issue, borrowed another but made no difference. When it is in neutral and reb up it's fine, only does when under load. Any ideas?
 

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2008 YZF-R125 (180cc)
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if you're not getting a fault code (i.e. sequence of flashes on boot up then it sounds most likely a movement-based wagglecontact like maybe the side-stand switch or something like that. Perhaps lean angle sensor but iirc you'd need to do ignition off and on again to reset that. page 8-7 of the service manual details the switches involved in starting/keeping it running, would prob start there.

Also maybe use a multimeter to check it's charging ok - so voltage across battery terminals ought to be 11-12.6v ish and when running 13.6v or so..
 
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