There are a number of other forum posts on this topic that all relate to YBR Injection models, most notably one that replaced the fuel pump:
1. I turn ignition on and engine light comes on, but pump does not prime, engine light still goes out after about 5 seconds.
bike wil not start as no fuel getting through. I fitted new pump and worked fine for a very short time then the same symptoms came back, any ideas please, thanks
Any idea's if the rectifier was faulty would this stop the fuel pump or if there is a fuel pump relay on this bike, or anything that may control the pump thanks
2. just went to start my bike.... it started up as usuall then it stalled itself, turn the key again and the orange light comes on as usual, but theres no electronic sound like normal. and the bike wont start,... ticks over, but doesn't fire. this also happened on Sunday and a previous occasion.
i assumed the electronic sound was the fuel pump engaging ?
now the previous two times ive had to wait about half hour, and it magically sparks up with out problems.
any idea what this could be... ill try and answer any questions i can.
this is a Yamaha YBR 125, 2008 model, just over 10 thou miles on the clock.
3. in the last week, my bike has failed to start 4 or 5 times now. every single time, is when the bike is sitting in direct sunlight, i have to wheel the bike in the shade (if there is any) wait for it to cool completely down before i can start the bike. ive asked a few bike nuts, and they have all said, "Fuel evaporating from the carb"
is there any bikers on here suffering the same thing, if so how can i solve it, ive got my local yammy dealer picking the bike up tuesday. but im going to a motorbike show on sunday and dont want to risk the bike failing on me.
4. I had noticed that lately my 08 reg Yamaha YBR 125 has started to sometimes stall when sat idle with the engine running on the stand. Also the engine hum seems to dip as though it will stall, but then sounds normal again. Tonight when i went to drive home from work it would not start, it turned over but would not engage the engine and start. I kept turning over and eventually with some throttle it started. It seemed to be o.k and i pulled away, only to get a little way down the road and the engine seemed to begin to die, almost like it had run out of petrol? (but i have a full tank) Again i turned it over in vein until eventually it kicked in and i could pull away. This happened about 6 times on the way home. When i was at high speed it was fine, no problem at all, but at low speed or at a stop it wanted to cut out. I don`t think it`s a major problem, but am not sure what to check or what the fault may be? I cannot afford to put the bike in for a check up and i believe it could be something tiny, that i could sort myself! I am a motorbike novice and have no idea what to look at. My friend says it sounds like it could be muck in the carburetta?