Cbr 125 05 just replaced air filter wont start.!!

Bik3rCh3f · Derestricted Danger Joined: 08 Sep 2011 Karma :

Hi there, need your help!
Today I took my bike to my mate to replace a K&N air filter with the original stock one.
Removed everything, fit the filter. Gave it a start-up and started but cut out within me letting the throttle go.
Started it again and gave it a test run. Cuts out after I let go of the throttle. Being an idiot I hammer on the throttle and the electric start in attempt of rescuing it. Use up all of the battery.
Took it back apart, put original filter back on, again nothing.
We cleaned the spark plug, changed battery and tried to start it again but while we held up the fuel tank (being told about the kinks in fuel pipe) STILL NOTHING!!
Please help Smile

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Nope. · World Chat Champion Joined: 16 Feb 2011 Karma :

Did you really feel the need to post this twice? Rolling Eyes

ANYWAY, when you fit a K&N filter you have to Upjet. If your sure you didn't touch the carb, put back the original air filter and charge the battery. It may just be that it doesn't have enough power to spark.

You could try bumping it and it may work depending on how much battery is left for the CDI.
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Former: Derbi GP1 50, Sachs XTC 125, Suzuki GSXR 400 GK73A, Kawasaki ZX7R, Suzuki DR250, Yamaha RD350
Current: 2011 Yamaha XT660Z Ténéré, 2003 Yamaha YZR-R1 5PW (In Build), 2009 Kawasaki ZZR1400

R6 Wilson · Trackday Trickster Joined: 31 Jul 2011 Karma :

Tried bumping it?
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Bik3rCh3f · Derestricted Danger Joined: 08 Sep 2011 Karma :

Didnt know how to delete the other one Laughing

We didnt touch the carb at all.
I do believe this is the case.(battery)
Just bumped it this morning, it started to kick in but as soon as i let go off the throttle it kicked out.
And how does the CDI unit work? Shocked

Can u bump start with a dead battery?
Thanks
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P. · Red Rocket Joined: 14 Feb 2008 Karma :

Being 05 its carbed.

Last owner put a different exhaust on it by any chance? With the K&N it should have been jetted slightly differently.

Does it run if you put the choke on? Yes you can bump these bikes with a dead battery Thumbs Up

Bik3rCh3f · Derestricted Danger Joined: 08 Sep 2011 Karma :

No everything was and still is standard, untill I put this air filter in.
I've tried bumping it but no look.
I'm just going to take it to a garage.

Thanks anyway Laughing

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Dr. Quack · Could Be A Chat Bot Joined: 17 Mar 2011 Karma :

It's likely to be either air flow or petrol which has been blocked, it may be worth tracing your steps back performing what you did again checking that you haven't blocked anything and that the air filter fitted was fitted correctly.
When you cleaned the plug was it wet with petrol or smelled strongly of petrol, if not there's no fuel getting through?

Check the back of the air box for one of these too, he could have slipped in while your wern't watching.
https://img836.imageshack.us/img836/4775/lunapic131555655139351.jpg

Bik3rCh3f · Derestricted Danger Joined: 08 Sep 2011 Karma :

Retraced my steps several times, still no luck.
As for the plug, it did smell of petrol, fuel and air is deffinately going through. Probally just the spark plug.
Any way i've got someone picking it up to fit all new parts, service and sort this problem out.
Thanks for your help, much appreciated. Smile

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I cook food... and ride a bike... great! Smile

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

If you take it to a garage, you'd better lube yourself up first. They don't charge any less for working on a 125, and when they see L plates and hear "fix it mister, fix it fix it fix it", watch for the £££ signs in their eyes.

Bik3rCh3f · Derestricted Danger Joined: 08 Sep 2011 Karma :

Im aware of that my friend, but unfortunately it's my mother that insists on having a proper mechanic sort it out. (Remembering i'm coming up to my 18th birthday)

I meant all the bolts to get to the air filter.
Im not sure what the colour was and I admit, I have no idea what they are Embarassed

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ThoughtContro... · World Chat Champion Joined: 14 Aug 2008 Karma :

Bik3rCh3f · Derestricted Danger Joined: 08 Sep 2011 Karma :

I didnt actually remove the tank, i left the pipes attatched and managed to hold the tank. Bit of a bother! Confused

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P. · Red Rocket Joined: 14 Feb 2008 Karma :

There should be 2 pipes on one side, thin ones for fuel.

On the right hand side there will be 2 large pipes... these do kink VERY easily... even with 2 people guiding it down they can still kink which is a ball ache.

Id whip the tank off and have a quick peek in there.

Bik3rCh3f · Derestricted Danger Joined: 08 Sep 2011 Karma :

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Take the air filter out, pop it on choke and open the fuel cap...see if that does anything? Try opening the throttle a tiny amount.

ThoughtContro... · World Chat Champion Joined: 14 Aug 2008 Karma :

So you stretched (and probably moved) the large breather and overflow hoses while you lifted and moved the tank out the way. Have you properly checked that they're not kinked somewhere down their route to the bottom of the bike? I usually pull em completely out with the tank and re-route em when I put the tank back on, easier than trying to fiddle about disconnecting them from the bottom of the tank.

Has the vacuum hose become detached from the carb maybe?
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Bik3rCh3f · Derestricted Danger Joined: 08 Sep 2011 Karma :

Bik3rCh3f · Derestricted Danger Joined: 08 Sep 2011 Karma :

ClockworkJesu... · Nitrous Nuisance Joined: 31 Jan 2011 Karma :

Have you tried adjusting the mixture on the carb? Surprised

If you didn't upjet, you'd have had to have richened the mix to make it run right... Right? Confused

Just stabbing in the dark here.

ThoughtContro... · World Chat Champion Joined: 14 Aug 2008 Karma :

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

you do def need some juice in the battery in order for the CDI to work. I know some are self powered ignition, but if its anything like my CB1, then it def will need some battery juice even for bump starting. I imagine the lights are always 'on' on these models and hence no switch to turn them off.

My advice is get the battery on charge.