Carb Repair Evo 4T

[stu109]

My Evo 2013 3004T has started putting out black smoke at higher revs.

I think the carb could probably do with an overhaul as it has not been looked at since I got the bike.

Does anyone know if there is a rebuild kit available for this carb?

Also, any tips for completing the work?

Thanks

 

 

[lineaway]

It`s all piece by piece and expensive. Also not very easy. Could be a broken intake boot as they are a problem. If its running good otherwise, the muffler could probably need repacked/replaced.

[Strutty]

when mine was pumping black smoke on full chat before steps it was the side diaphragm being dirty .

have you tried cleaning all the jets and gently cleaning both diaphragms?

[stu109]

I have taken the carb off, what a swine to get out!  Not looking forward to getting it back in.

I will give it a good clean and may invest in some new diaphragms.

At the top of the carp there is a connector for a tube.  On the parts diagram it is labelled oil breather joint.  Is there something connected here.  There was nothing on mine and being open it was full of crud right through to the top of the diaphragm.  Any thoughts? 

[mcman56]

There is a vent that gets a tube to air plus another connection that needs to be capped off.  See:

 

[stu109]

Hi

Got it all back together now, what a nightmare!

I was looking to buy a new needle.  My only experience of this type of CV carb is a worn needle making the bike run rich.

I could see the needle was worn, but could not get one straight away from Beta UK as it was an order only.  As a compromise I lowered the needle one notch.

The black smoke has stopped.

Thanks for everyone's help.

Stuart