125 Zero or hero carburetor

[Gemok]

It looks like when in my post weird Honda 125 I was overly optimistic when I said it was a runner I went to grab it today and I can't get it to idle properly anymore.

Everything said below is with choke on as when it's switched off bike cuts out completely unless the throttle is wide open.

At "idle" it slowly builds the revs up till they're at about 6000

I tried adjusting the throttle stop screw but no matter how small an adjustment I made I couldn't balance between it dieing off and racing away.

Even when I had it set to slowly die off if I blipped the throttle and the revs hit 3k the revs would pick up and sit at 6k they'd only drop back down again when I undid the throttle stop at least a full turn then naturally they fall off completely and the engine will cut out.

I've had the carb off the bike stripped it and cleaned it out today but that has not seemed to help.

I've tried playing with the pilot screw which is a prick to adjust on the bike had to make a "tool" out of a paper clip .

I suspect the person who's garage it's in has been mucking around with something but I can't figure out how to put it right . The throttle doesn't feel like its sticking anywhere either

Looks like I might have to pay for someone to have a look at it. Unless someone has any bright ideas?

[ThePhatomfart]

Hi ,what carb make is it, Keihin or Mikuni should have it written on the side along with designation (letters and numbers)

[Gemok]

Bugger didn't think to note that down.

And won't be round there till next weekend.

[Guest]

Everything said below is with choke on as when it's switched off bike cuts out completely unless the throttle is wide open.

 

Are you sure you're using the choke lever the right way round? On a normal CG the choke is off when the lever is all the way down. With full choke you require quite a bit of throttle to keep it running or it will cut out as there's no mechanism to raise the idle when the choke is on.

[Gemok]

Mines a frankenbike lol

With lever all the way down the flap inside is closed

Half way it's open a sliver

All the way up it's wide open

[TimR]

Do you

A Have fuel in it

B have the tap turned on and sufficient fuel level to feed the on setting

C Turned it to reserve if the fuel level is low enough to require it

[Gemok]

A) Yes filled the tank

B) Yes on

C) N/A

It would happily sit and run at 6000 revs without me touching the throttle for as long as I'd let it with choke on or half way.