CBR 125 problem .. still

[adamcfc]

Have a Honda CBR 125, its running rich as the plug indicates dry fouling, and the exhaust backfires flames on de-acceleration.

Checked the air filter and its okay, tried to adjust the mixture but found its covered with a tamper-proof metal casing?

The carb is hard to get to properly on the left side (which is where im told the mixture screw is), there are two phillips head screws that i believe hold the choke housing onto the carb, and then this casing im talking about. Its at the front (on the left side) where the carb connects to the induction valve.

Is this the mixture screw, and how can i adjust it?

Also, when i start the bike cold, it revs at about 4000 for about 6 seconds then drops down to the 1500 set idling speed, any ideas?


Cheers, Adam

[Vincent]

Before messing up all the settings, it might be worth checking the choke is working ok.
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[P.]

Is it between 2004 and 2007?

Hand operated choke on the handle bar?
Known to stick very often... best thing to do is disconnect it, get it all cleaned up and lube the choke mechanism on the carb.

The mixture screw is behind a small cover, you need a very small drill to drill the casing off... but again, before you go toying with that (it more than probably doesnt need adjusting) check the choke

[adamcfc]

Yeah its a 2004 model, cheers guys.

So il undo the 2 screws holding it on the carb and make sure everythings sliding nicely and lubed up?

Is this causing the backfiring, or the high revs at startup, or both?

Adam

[P.]

[st3v3]

Is there only me that would squirt a can of WD40 down the cable outer..?
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[temeluchus]

3-in-1 oil would be better. Give the cable and choke mech a good slathering in oil.

If that appears well may be shite in the float bowl stopping the float needle closing which can cause the motor to flood.
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[adamcfc]

Yeah steve il try that, cheers.

The carb is just a right pig to get to, and i cant check the float bowl really without dismantling the carb?

Adam

[P.]

[adamcfc]

It seems on mine the only way to get to it all is by removing the fuel tank which is a bi***.

There is the blue panels with the aur vent on? But on the left side the 2 bottom screws are rounded off so thats not coming off easily. So at the moment my only real access is my hands up above the engine up to the carb.

Im not going to be able to do anything until sunday, but il take a photo of the plug and upload it, although it is black.

Cheers

[P.]

Nah, i've gt the 04 one currently.
Dont worry about the tank, its one bugger to get back on!

You "can" get to the carb once the plastic dress is off. I'll hunt a picture of my CBR for you... if you can call it that

https://a1.sphotos.ak.fbcdn.net/hphotos-ak-snc6/185718_195150683843164_100000447005731_653298_652493_n.jpg

[adamcfc]

Cheers Paddy, a pictures just what i need

Although my dad asked a garage today, and they said the backfiring was because the standard air box had not been upgraded after adding the race can?

Does this sound plausible?

Adam

[ThoughtContro...]

The tank is pretty easy to get off. Just make sure you disconnect the plug for the fuel level sensor, make a note of where the fuel and vacuum hoses connect to, then instead of trying to remove the breather and overflow hoses from the tank, which is a total bitch, just pull them out from the frame as you remove the tank. They aren't fixed by anything so it's pretty easy.

Then when you put the tank back on just re-route the hoses back through the frame. It makes the job dead simple.
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[st3v3]

[P.]