Honda CBF 125 enging cutting out

[Khiss]

Hello,

I recently bought a 2011 honda cbf 125, with only 1000 miles on board. The bike is in perfect condition, but being so new it has never been really serviced by the previous owner, excepting fuel change a month or so ago.

It was perfectly fine for the first 50 miles but, today while I was riding the engine started cutting out.

Basically if I put it in neutral it idles fine, but if I start reving it, at around 5k RPM it just stops reving, even though I'm holding the throttle, goes back slowly to zero and dies (all this standstill an neutral). If I leave it for 5 minutes with the engine switched of, it works fine, but then I've got it up to 3rd gear and the bike started jerking, as if I was letting go and pulling the throttle, even though I was holding it constant.

My first thought would be that it's the sparks, but then again, if it is the sparks, leaving the bike standing for 5 minutes, shouldn't make the situation go away.

Any suggestions would be appreciated. thank you

[mealexme]

you havent done what I did when I first got my bike have you and presumed the fuel gauge was correct? Mine said i still had fuel when I didnt, check the tank lol. It does sound like you are running out of petrol though, or a fuel line is blocked.

Why was the fuel changed a month ago? If it had been left sitting for a while then its possible the fuel filter is blocked also

ps, welcome to the forum, say hi in the newbies section

[Khiss]

Lol I've meant oil change

I've checked the fuel level and it seems to me that there is at least another litre inside.

[eastanglianbiker]

if there is at least a litre you are guessing try turning fuel tap onto reserve or go and put some more fuel in it and see what happens then,also dont forget to check oil level in the engine 2 or 3 times a week as they do sometimes use some and it doesnt take a lot to wreck the engine

[klingelton]

There was a problem a little while ago with the little cbr's fuel pump. Honda recalled a whole load of these.

Basically in warm weather, the engine would begin kangarooing like you're describing. After allowing it to cool down, it would start normally, but display this characteristic. I believe it was the fuel pump that was replaced on bikes with this problem and it went away.

I tought it was only on older bikes, but could be wrong. At any case, it's a known fault. Blame the warm weather!

[Lumor_uk]

check valve clearance - needs checking every 2.5k miles or every 6 months whichever is sooner

take spark plug out and describe here what it looks like, is it wet or soot covered - needs replacing every 12 months

check an in line fuel filter hasn't been added causing a kink in the line

if you haven't got the manual let me know and I'll post up the specs, though there is a great blog on how to do it yourself f you Google it

.

also depending on what month it was originally purchased it's still in warranty?

p.s. to above there is no fuel tap on the cbf 125

[Khiss]

Thanks for the reply guys. It haven't done it since then, so I'm not sure what the issue was.

I did refuel after, but it took only 8L which means that there should have been another 4-5l left inside

[Garth Calitz]

Im having the same issue, when the ambient temps go up in the high 30sC I can expect the bike to start playing up, stppoing in a shady place for a half hour sorts the problem out for a while. Most of the riding is done in the early morning and evening so it doesn't have the problem then 

[RideWithStyles]

out.

 

 

Edited May 15, 2024 by RideWithStyles

[Grumpy Old Git]

Just read this topic and then realised it was posted in 2013!!!!!!!

[RideWithStyles]

Yes 

Edited May 15, 2024 by RideWithStyles