I'm having some bother with my fantic 305, it will only run with the choke on. With choke off it runs up and down and and soot up the spark plug. Iv stripped and cleaned the carb and took off the reed valve and checked them and all looks good! The manifold lookx good too no ctacks ect. Any ideas what else I could check? Cheers!

 You need to clean the choke circuit including the float bowl.

Thanks for that, does it all seperate easily?

I'm having some bother with my fantic 305, it will only run with the choke on. With choke off it runs up and down and and soot up the spark plug. Iv stripped and cleaned the carb and took off the reed valve and checked them and all looks good! The manifold lookx good too no ctacks ect. Any ideas what else I could check? Cheers!

are you sure the pilot jet is ok? if there is the genuine dellorto carb fitted, it'd have a 2nd slow jet and circuit in the bowl. is this circuit ok?

All looks clean I stripped i took them all out and blew them out with carb cleaner. It is a genuine dellorto carb.

Does the 305 fantic carb have an air screw or a petrol screw ?

it'd be a air screw

 

this type of dellorto (oval inlet) is very difficult to set up. It has a really small pilot jet and this is hidden really deep in the body so most time it is blocked

 

Sorted!  I changed an o ring on one of the jets and a bit of an adjustment on the air screw and it now runs brilliant!