Problems with new ybr125

nick_harris · Two Stroke Sniffer Joined: 27 May 2010 Karma :

So, had my bike for 6 days now and this morning i waved it good bye as it was picked up to be repaired Sad

. So, the problem is:
I'd flooded the bike a couple of days ago (attempted a u-turn in 2nd and stalled) so left the bike for a while, then when it started left it to tick over for a bit and she seemed to be running fine. Then yesterday morning as i was about to set out for a ride the engine light flashed at me. But after stopping and re-starting the enginge the light had gone, so pressuming it was a bit of dirt in the electrics i rode off anyway. Got to my destination had a fag geared up and the bike wouldn't start Shocked

. Managed to get it running eventually by fully opening the throttle while pushing the electric start and rode home. So, i think there's a problem with the fuel injector (or electrics controlling it) but i'm not sure. Also, the spark plug was covered in petrol but i've cleaned it now. And, on top of all that, it's now idling at about 2-3k rpm which worries me a bit. So, even thought it's currently being fixed just wanted to know if anyone knows what's up with it?

And and and, how effecient are yamaha for repairs generally?
Thanks. Very Happy

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Yamaha YBR125 (2010) - BROKE!

baldy · World Chat Champion Joined: 16 Feb 2004 Karma :

It could be the choke that is stuck on, or a faulty sensor. When you pick it up ask what they did and for the old parts if they replaced any. This way you get a idea of what it was and to make sure they actually did something.
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One day i will rule the world, just not today.

Vincent · Banned Joined: 16 Oct 2006 Karma :

nick_harris · Two Stroke Sniffer Joined: 27 May 2010 Karma :

neil. · World Chat Champion Joined: 24 Feb 2008 Karma :

Yeah the 2007 onwards YBRs are fuel injected. More to do with complying with EU emmissions laws than performance etc. I personally prefer a carb as I know what's going on there. However, you can do some diagnosis of the FI system, it's documented in the Haynes book. From what I remember (having skimmed that section as I have the carbed YBR) there are some LEDs that indicate various errors in the system. If you have a multimeter you can test the temperature sensor, or at least you can with the carbed bike as it has one that controls a heating element on the carb when it's cold. If it's still causing trouble I can dig out the book and have a closer look after work if you like?
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CBT February 2008 | A2 June 2008 | Yamaha YBR125 (written off) | Honda CBF125 (current)

. · Renault 5 Driver Joined: 18 Feb 2008 Karma :

Do you wait until the yellow system light has gone out before starting the bike ?

Your bike should tick-over fairly fast when cold before settling down when hot - although 3,000 does seem too high. The dealer should readjust the tickover at the first service when the engine has loosened up a bit, but it only involves turning a slotted brass screw on the right hand side of the 'carb' body.

My knowledge of EFI is limited but minor problems can sometimes be cured by disconnecting one of the battery leads or removing the fuse for about 15minutes.(I regularly do this to sort out a problem on my car). However this will probably clear down the fault logged in the system memory, but if its a persistent problem it will log it again soon enough if disconnecting it from the power doesn't sort it.

Also some systems assume that the throttle is always fully closed during the start up/check procedure (the few seconds when your yellow light is lit) if the throttle is in any other position it will cause fuelling problems, which is why you must ensure there is always sufficient slack in the throttle cable, so nothing is partially opened if the handlebars are on full lock in either direction.