I have posted this question on another forum and wondered if anyone else has had this problem and what the problem could be?.

Basicly I have changed the carb on my 1996 1200 C sportster but I had this problem with the last one, it may just be coincidence, not sure.

But when I open the choke/enrichers petrol drips from the air box for a little while, once the bike warms up it stops.

The last carb would do the same.

The new carbs only difference was the throttle cable arm, which I swapped over and the older one had a over flow pipe at on the bottom, again no problem if I wanted to change over.

This problem has haunted me since I got the bike over three years ago, but yet it hasnt been solved even changing over the carb.

I have also changed the vacum pipe.

The bike has a stage on done on it and the new carb was set up already when I got it.

It has already stripped the paint on a bit of the engine and is driving me nuts.

HELP!!!!!

 

Leaking accelerator pump diaphragm? Is your float adjusted properly?

John

 

Not sure, my next port of call was to strip the carb down, but I find it wierd the way both carbs have done this.

could it be anything to do with the filler cap?.

 

It's most likely coming from a stuck float or dirty needle/seat.
With the old carb, the fuel should have been running out of the overflow tube unless it was plugged up, but on the new carb without an overflow, it will wind up in the A/C.
I'd recommend using the bowl with the overflow tube regardless.

 

Yeah I will change it over, I have a carb building kit on hand so I will have a go and rebuilding the carb, if anything it will eliminate the carb.

I went into the garage yesterday and started the bike with hardly any choke and used the trottle to keep it running turned the choke off and no petrol dripping.