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Jul 08

Posts: 7

Bike cutting out while riding

Ok, having a problem with my beloved (annoying) Honda CBR 125R (05)

Riding along the other day & the bike cut out at about 40mph.

Wouldnt start again, tried to bump it with no luck  & eventually i think the battery just died as it stopped clicking when i hit the starter & the neutral light had more or less gone out.

I was on my way to honda anyway to get a new reg plate made up to get it through the MOT, so pushed it there,explained the problem and they said they'd have a look.

Picked it up the next day, they said they'd checked the engine & the battery and seemed ok.

Riding it home..happened again. I've got no idea, Honda apparently have no idea.

Usually i can fix the bike myself & it is very well maintained but i can't diagnose this problem (i'm not great at the diagnosing part, just the fixing part!).

Really need some help, MOT booked in 3 days from now and if i can't fix it myself as Honda wont be able to do anything about it until 2 days from now...and i'm running pretty low on funds as it is!



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  • Posted 4 years ago (07 January 2011 18:47)

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Sep 07

Posts: 2816

James600zx says:


It could be carb-icing, maybe. It's the season. I'd expect an experienced mechanic to think of that though.
To resist icing try some Silkolene Pro-FST additive in the fuel tank.
If it cuts out again wait a few minutes for the heat of the engine to thaw the carb before trying the starter.
The dealer re-charged the battery for you, presumably?

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Apr 08

Posts: 3042

AdieR says:

Other idea

being winter, is damp electrical / ignition system.

Try replacing your spark plug and HT lead, and make sure electrical connections are clean, dry and tight.

I'd also double check your battery - after a while they can fail to hold charge, esp on short-ish runs where it won't be getting sufficient charge from the generator / alternator.

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Jul 08

Posts: 7

Problem possibly solved

Well, turns out my make & model of bike was recalled a few years back due to a faulty ignition coil:

From the VOSA website:

"In certain conditions it is possible for contaminated water to penetrate into the ignition coil causing the internal components to corrode. This can result in hard starting, poor engine performance and in extreme cases cause the engine to cut out"


The previous owner has chosen to ignore this product recall.

and unfortunately it probably explains my battery & light problems i've had for the last year or so.


Not sure where i stand from that point of view, but at least my local honda dealer are going to fix it for free. (Though i suspect that they could be in the shit for selling it on without checking it had been required for a recall?)

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Aug 02

Posts: 3270

eatcs01 says:

cutting out

Might also be worth checking the side stand switch...

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Jul 08

Posts: 7

working again i hope!

Got it back today, seems to be running ok.

my local honda dealer tried to charge me for taking my bike through MOT (which i had only booked because they told me it was fixed.  Wasnt until the day before the MOT they checked the recall notices).
Cheeky bastards,lol

thanks for all your help though!
Seems like it was the ignition coil afterall!

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