Posted August 17, 201212 yr hi all after some help I've got a wr125x on a 2011 plate, only just got it. when i bought it it had a blown starter so i replaced this bike still would not start but would bump so I've now replaced the starter clutch and fly wheel now starter turns engine over but wont start and now wont bump start either. I've checked spark and got a good strong one(new plug) fuel pump runs as had pipe off injector to check good strong flow of fuel. removed injector and checked it getting a good spray of fuel from it. every now and again it gives out a massive back fire when trying to start. engine management light goes out ok, LCD Set's to 0 when ignition switched on. forgot to say at some point it's had a 180 head conversion after market exhaust and after market ecu system fitted any help would be great cheers carl
August 18, 201212 yr Bad ecu posibly ..the timing is off droping the spark at the wrong time. Check coil and pickup and rotor timing
August 19, 201212 yr Author cheers dt502001 had a look last night and found the woodruff key that locates the flywheel/generator has sheared so think that will be problem will let you know the outcome when i replace it
August 19, 201212 yr Moderator it probably hadnt been torqued up properly, often the way when people start tinkering!
August 19, 201212 yr Author yep was woodruff key as put new one in and bike run great for about ten mins ten woodruff key failed again so going to put in to local bike shop to have it done (as i dont think i got bolt tight enought) then hopefull it will be ok will let you know
August 19, 201212 yr Author yep thats how i tightened it up apart from that i used a fabric strap to tighten it mate, dont supose yu know the correct torque setting do you as carnt find it any where cheers
August 19, 201212 yr Moderator a fabric strap probably wont be man enough, I dont know the setting for yours though it will be in the workshop manual, as a guide though my DT175 is 40 lb/ft
August 20, 201212 yr Author just an update got a chain strap and re tightened the flywheel and now bike starts up and runs great cheers for your help airhead much appreciated
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