Honda CBF125 fuelling or electrical?

sgtcalle · Spanner Monkey Joined: 07 Sep 2011 Karma :

Hi All.

I foolishly tried to ride my girlfriends 2010 CBF125 the 45 miles to work the other day. Got 35 miles in when the bike started surging and dieing, before eventually spluttering to a halt. The symptoms were more or less as shown here:

https://www.youtube.com/watch?v=Yz6ljcPzY7E

I have read online that this year of CBF were recalled for faulty fuel pumps, and the symptoms would seem to support this. However, upon trying to restart the bike I found the battery was flat. I bumped it, managed to get a mile or two further before the same thing happened. I had noticed a bit of battery performance degradation in the days prior (I.e not turning over as vigorously). Would a reg/rec or similar fault cause the fuelling issues described? Loath the replace a £200 fuel pump unless I have to.

Any help much appreciated as usual.
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CBR600F '02
Manchester

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

If you suspect the battery then test that first.

If not enough juice in the battery then there won't be enough to convert into big happy sparks for the engine.

AVO meters are easily obtainable (without a licence) from your friendly

Maplins.

The battery should have a minimum of 12volts at rest. But 13v is normal.
Under 12v indicates a bad battery.
But these tests are not dead accurate and should not be relied on.

If you have someone to help.
Put the tester to the 20 Volts DC range.
Connect the red to the battery Positive +
Connect the Black to the Frame or Battery Negative -
Turn the bike over on the starter and observe the meter.
It should read 12v or a little under.
If it reads under and rapidly drops to the low numbers then the battery is goosed.
This is a Load Test and is 'almost' the heaviest test for a battery.

Due to bad battery (5 years is nearly old).
Bad charging system.
Bad connections.
And some other less likely stuff.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

nowhere.elysium · The Pork Lord Joined: 02 Mar 2009 Karma :

Kangaroo hopping? They have a known issue with the fuel pump. Check that.
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'10 SV650SF, '83 GS650GT (it lives!), Questionable DIY dash project, 3D Printer project, Lasercutter project

zark · Trackday Trickster Joined: 18 Dec 2013 Karma :

if they were recalled for fuel pumps - would a quick call to honda establish if you have had a recall or need one?

otherwise - on my FI YBR, every running, starting or lumpy issue was caused by a stator fault not charging the battery. a multi-meter will save you untold guesswork
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CBT - Oct 13. Theory - July 14. Mod 1 & 2 - June 15.
Rides a Fazer like an idiot... Edit: Now ride a Fazer Thou...

Pol Anorl · Banned Joined: 13 Apr 2010 Karma :

fuel pump.

known issue
recall for many

call honda.
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Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

How has a hooky fuel pump discharged the battery?

Multimeter.

Charge battery.

Diagnose from there.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

sgtcalle · Spanner Monkey Joined: 07 Sep 2011 Karma :

thanks for the replies.

I will of course be investigating both avenues - but as rogerborg suggests, how would a faulty fuel pump lead to a dead battery.

If my bike has missed a recall, are Honda liable to fix the problem for free on a 2010 bike? Surely they would just say we made every effort to contact the owner but with no success?
____________________
CBR600F '02
Manchester

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

vijay jaganathan · L Plate Warrior Joined: 06 Apr 2016 Karma :

i would like to share my experience.i also had the same problem two months after searching web i thought it was due to fuel pump.I am from india, new fuel pump costs around 75 pounds which is a big money here.But , i found odd similarity with the problem.It occurs either after servicing or during rainy season.So,i checked the spark plug and found water in the noise suppressor.The old noise suppressor cover is a three piece unit.So, water can enter easily and changed with a single piece unit which costs less less than 1 pound and now it is running fine