CBF 125 makes a bang.

[locked]

Recently I've noticed upon starting the bike in these cold mornings, after a couple of minutes with the engine running there is a bang on the right hand side of the bike.

Its happened every morning now for the past week. I can't see any physical signs of damage, no leaks or anything out of the ordinary. Engine oil is nice and full so I am kinda scratching my head here.

Its not due for a service for another 900 miles so i will ask the question then. In the mean time can anybody give me a heads up what it might be?
____________________
on the look out for my next bike....
CBT Passed - 13/09/09 Theroy Passed - 19/12/09 Mod 1 Passed 04/05/10 Mod 2 Passed 14/05/10 - Free to ride ANYTHING!
Motorcycles are perfectly safe as long as you remember they're dangerous.

[Kickstart]

Hi

Mechanical bang or a bang from the exhaust?

On such a new bike neither sound right. A bang from the exhaust would likely come from extra fuel landing in the exhaust unburnt then being ignited. Would suggest that it is running VERY rich when warming up or misfiring. However don't know enough about the CBF fuel system to comment beyond that.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[N cee thirty]

hmm a mates got a cbf and the exhaust makes a few noises when cooling down,but not when warming up

not a chance you could get a video or something ?
____________________
'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[locked]

sounds more like a mechanical bang. It sounds like somethings ricochet off the engine and hitting the plastic cover. I'll get a video after work as it only happens after the bikes been standstill for a while.
____________________
on the look out for my next bike....
CBT Passed - 13/09/09 Theroy Passed - 19/12/09 Mod 1 Passed 04/05/10 Mod 2 Passed 14/05/10 - Free to ride ANYTHING!
Motorcycles are perfectly safe as long as you remember they're dangerous.

[Kickstart]

Hi

Sounds odd. If it happened when you first moved the bike then I would suggest a brake pad sticking to the disk. Similarly the chain could slap the chain guard if way too lose and probably if wearing very unevenly (but I would be very surprised at this on a new bike).

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[chris-red]

Clutch possibly?

Whereabouts on the RHS of the bike.
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[PizzImperfect]

My CBF at times makes a popping sound when cooling down or even sometimes warming up... But it's usually only a pop or 2 before it settles.. I assumed it was the metal expanding/contracting as it warms/cools...

How many miles have you covered mate?
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Honda CBF125

[locked]

imagine your sitting on the bike, its the side where your right leg is resting on the plastic cover (not the fairing)

My bike does the usual expanding and contracting noise like all bikes do but this bang is defiantly not it.

Imagine using your knuckles and knocking your tank hard, thats the sound its makes but on the right side where the engine/exhaust is.
____________________
on the look out for my next bike....
CBT Passed - 13/09/09 Theroy Passed - 19/12/09 Mod 1 Passed 04/05/10 Mod 2 Passed 14/05/10 - Free to ride ANYTHING!
Motorcycles are perfectly safe as long as you remember they're dangerous.

[locked]

only 1.6k miles
____________________
on the look out for my next bike....
CBT Passed - 13/09/09 Theroy Passed - 19/12/09 Mod 1 Passed 04/05/10 Mod 2 Passed 14/05/10 - Free to ride ANYTHING!
Motorcycles are perfectly safe as long as you remember they're dangerous.

[PizzImperfect]

Very odd. I can't help you mate sorry
____________________
Honda CBF125

[DrDonnyBrago]

I'd take the plastic cover off and see if it still does it, or see if you can isolate the noise.

Sounds like something is under tension and when things around it expand with heat it is released, maybe a clip or fastener or something. Perhaps something is warping with heat, like how a crap baking tray will ping into a new shape in the oven?

[SillyMe]

If it's not constant it could just the expansion of the exhaust or exhaust components, also as engines warm up the heat expansion of valves and valve clearances slightly affect combustion timing so you may even a very slight issue with back fire.

I get taps when my engine warms up which is unusual because engines normally become less noisy as they warm up. It turned out to be something totally unexpected but common on my bike. The noise coming from chain rattle sounds as though it's coming from other places on the bike too. Weird!
____________________
Once made equal to man, woman becomes his superior.
The man who says "I may be wrong, but -" does not believe there can be any such possibility
Owned and rode: Honda 100H, Honda MBX 125, Kawasaki AR 125, Suzuki RG 125 Pepsi, Honda NSR125 RK, Honda NRS 125 race bike, Suzuki GSXR 400 Bandit, Aprilia RS 125 O2, Honda CG125, Kawasaki KMX 125, Aprilia RS 125 O6, Suzuki XT225 and now Honda XR 400. ( A few scooters and other dead beats in between)

[Masked]

Mine has done the same thing before, was the fairing popping in and out of the rubber lugs. Check that the screws holding the fairing on are done up properly, I replaced the screws on mine with allen bolts as the normal ones are really soft.

[PizzImperfect]

Maybe there's someone inside.. trying to get your attention...

https://thescenarios.org/wp-content/uploads/2009/08/men-in-black-alien.jpg
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Honda CBF125

[locked]

[SillyMe]

Thanks for the pic Pizz, another one for the collection.
If you ask me I think there's a little leprechaun dancing on his battery.
https://img177.imageshack.us/img177/4051/oie217336ydpa3pvc.gif
____________________
Once made equal to man, woman becomes his superior.
The man who says "I may be wrong, but -" does not believe there can be any such possibility
Owned and rode: Honda 100H, Honda MBX 125, Kawasaki AR 125, Suzuki RG 125 Pepsi, Honda NSR125 RK, Honda NRS 125 race bike, Suzuki GSXR 400 Bandit, Aprilia RS 125 O2, Honda CG125, Kawasaki KMX 125, Aprilia RS 125 O6, Suzuki XT225 and now Honda XR 400. ( A few scooters and other dead beats in between)

[PizzImperfect]

Take that casing off the side mate.. Ask the little fella what his problem is.

[SillyMe]

LOL!
____________________
Once made equal to man, woman becomes his superior.
The man who says "I may be wrong, but -" does not believe there can be any such possibility
Owned and rode: Honda 100H, Honda MBX 125, Kawasaki AR 125, Suzuki RG 125 Pepsi, Honda NSR125 RK, Honda NRS 125 race bike, Suzuki GSXR 400 Bandit, Aprilia RS 125 O2, Honda CG125, Kawasaki KMX 125, Aprilia RS 125 O6, Suzuki XT225 and now Honda XR 400. ( A few scooters and other dead beats in between)

[PizzImperfect]

Or it could be something completely logical. But if it is what i said let me know and i'll give u £50 for him
____________________
Honda CBF125

[SillyMe]

LOL!, And if it's what I said I want that pot of gold off him!
____________________
Once made equal to man, woman becomes his superior.
The man who says "I may be wrong, but -" does not believe there can be any such possibility
Owned and rode: Honda 100H, Honda MBX 125, Kawasaki AR 125, Suzuki RG 125 Pepsi, Honda NSR125 RK, Honda NRS 125 race bike, Suzuki GSXR 400 Bandit, Aprilia RS 125 O2, Honda CG125, Kawasaki KMX 125, Aprilia RS 125 O6, Suzuki XT225 and now Honda XR 400. ( A few scooters and other dead beats in between)

[chris-red]

If it only has 1.6k on it it should still be under warranty, don't touch it let a dealers sort it.
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[locked]

[locked]

[Olivernoob]

sorry to drag out an old thread thought it was better than starting a new one! Im just wondering if you sorted this problem as i have the same thing and im not sure what it is?

[scarborough_lad]

Mine does the same, try tightening the bolts holding your heat shield to the exhaust.