YBR Starting/running problems

s1h · Nova Slayer Joined: 14 Jan 2010 Karma :

Afternoon, Been having a couple of problems with my Yamaha YBR just recently. Wondering if anyone can give any pointers. 125 2005 carb model.

It started last week when I rode it to work in the snow got about 5 miles from work and it just lost all power. Like there was no fuel getting through just nothing at all when you pulled back the throttle, the lights still worked and the neutral light was still on however when i pushed the indicator it didnt flash just stayed on as a solid light.

After leaving it for a few minutes i managed to get it started using the kick start, the electric start just made a wimpering noise if anything at all. Got another 2 or 3 miles and it did the same thing again and no matter how hard i tried couldnt get it started. Pushed it to work left it there 2 or 3 days till the weather improved, tried it again and it started off the kick 3rd go. Let it run for 10 mins turned it off left it a while and worked off the electric start as well, all lights and indicators etc working as they should.

Went to ride it home the next morning (13 miles) bit of snow and a lot of slush on the road got 2 or 3 miles from home it did exactly the same thing, couldnt get it started had to push it home.

People are telling me different things. Battery is knackered? Crap in the carb, ice in the carb, fuel line frozen.

Anyone got any ideas? Just to note after pushing it home i put it in the garage overnight and it started first time the next morning. It starts fine now but im reluctant to use it incase it breaks down again part way through my journey.

Moo. · World Chat Champion Joined: 11 Jan 2009 Karma :

If the electrics are going haywire, suggests to me it would be that causing the problem.. could this also affect the spark plug?
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A2 Passed 18/6/10

s1h · Nova Slayer Joined: 14 Jan 2010 Karma :

Mark65 · World Chat Champion Joined: 16 May 2008 Karma :

People are telling me different things. Battery is knackered? Crap in the carb, ice in the carb, fuel line frozen.

Ive read about carb icing and it sounds similair, i believe people put a bit of isopropynol alchohol in the fuel to combat this, but wait till a more experienced person comes along, although ive not been able to ride mine the bike still gets started twice a week for 10 min and its been ok but your on the road in ice cold weather.
I would think its one of the above.

Mark
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07 Yamaha YBR125, 07 Honda CG125 , 15 CBR300R (Chocolate Crank, Deaded), 16 CB500FA, 19 Honda Forza 300, 70 Suzuki SV650

crackpotterpi... · Renault 5 Driver Joined: 15 Nov 2009 Karma :

it sounds like you have 2 seperate problems there,after you left it running for 10 mins you say that it had charged the battery up? if thats the case your charging system would seem like its ok but if you can get hold of a multimeter and check the charging at the battery should be about 14 volts.Could be an intermittent charging fault maybe the rectifier? And i think the running fault could maybe be the carb and jets need cleaning............all the best
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1990 jc20 nsr125-sold,2003 cg 125-sold currently no bike.........might get another 2 stroke me thinks much more fun

s1h · Nova Slayer Joined: 14 Jan 2010 Karma :

To be honest the electric start not working now and again doesn't bother me. Its not hard to kick it. Its the problem with it cutting out and having to push it home.

I'll try a multimeter on it.

Got the Haynes manual coming in the post tomorrow, finally they have brought one out for this bike i have been looking for one for the last few years. Hopefully that should have some help with cleaning the carb etc.

TUG · World Chat Champion Joined: 12 May 2007 Karma :

That is odd. I usually only work on the injected bikes but keep me informed.
When was it last serviced? i.e. oil change.
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Haz ER-5, innit!

s1h · Nova Slayer Joined: 14 Jan 2010 Karma :

TUG · World Chat Champion Joined: 12 May 2007 Karma :

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

The '05 model has a battery that needs to be topped up with distilled water. Lots of people overlook this and the level drops, leaving half the plates exposed and knackering out the battery. Worth a look, perhaps? Other things to check for would be crap stuck in the fuel cap vent, or a clogged fuel filter perhaps? Have you tried switching to reserve and seeing if the problem persists, to see if one of the inlet pipes is blocked?
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CBT February 2008 | A2 June 2008 | Yamaha YBR125 (written off) | Honda CBF125 (current)

TUG · World Chat Champion Joined: 12 May 2007 Karma :

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

Alexio · World Chat Champion Joined: 27 Aug 2009 Karma :

TUG · World Chat Champion Joined: 12 May 2007 Karma :

It disappears because of boiling when used thats why you have to vent it (as far as i'm aware might be wrong). The battery must be 2-3 yrs old for the level to drop below the lower marking on it. I fill them to the top line when i PDI a new bike.
If the battery is 3-4 yrs old and hasn't been maintained then it could possibly new battery time, Its very rare for a battery to prolong its life i think the best we had was 6 years but the bloke charged it every night and generally looked after all his bike.
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Haz ER-5, innit!

s1h · Nova Slayer Joined: 14 Jan 2010 Karma :

Thanks for the comments. I'm positive it has to be electrical.

Tried it on reserve and it still did the same thing. Battery has been topped up and charged regularly plus I use it for a 25 or 30 mile commute each day so its not left to run down for weeks at a time.

Saying that for the last day or 2 it has been fine.Until I came out of work tonight in the pouring rain turned the key. Nothing, no neutral light, no fuel gauge going up no lights nothing at all. Wouldn't work on kick or electric or bump.

I think it must be wiring rather than the battery as I tested the volts on the battery with a multimeter and it read 13.2V or there abouts. Which according to the haynes manual is fine as it should be between 12.8 & 13.2.

However this next part I can't explain. After disconnecting the battery and taking it off I tried to kick start it and it went first time. Does that give anymore indication of what the problem could be?

It was running fine as well although I left it at work as I didn't dare try and get home incase it cut out and had to push it again or be stuck in the pouring rain.

I'm slowly starting to lose patience with it but am loathed to have to take it in somewhere and pay someone unless absolutely neccersary.

Any ideas ?

Mark65 · World Chat Champion Joined: 16 May 2008 Karma :

I think a multimeter can show a battery in good condition but it may be duff, they use another tool to test the battery, it presses on both connections at the sae time and tells you if its ok or not.
I think and may be wrong here but if one cell is knackered and the others are fine and fully charged it may seem like its fine.
Hang fire and others more experianced will be on, although if it starts fine all the time when you kick it over it does sound electrical, i would take the battery off and have it tested properly.

Mark
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07 Yamaha YBR125, 07 Honda CG125 , 15 CBR300R (Chocolate Crank, Deaded), 16 CB500FA, 19 Honda Forza 300, 70 Suzuki SV650

TUG · World Chat Champion Joined: 12 May 2007 Karma :

Your bike was fine until today/yesterday when it had rained and you lost all power?
That is quite odd to be honest, You have said the bike is charging the battery but what does the battery read on its own? then if left for a few hours?
The reason i ask is, when i had my 400 the battery was kaput and it would hold its charge for a few mins then completely discharge.
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Haz ER-5, innit!