There are a few varations to 3k carby venturi sizes.

I like the 21mm pri and 25mm sec, but these one's do suffer a off idle stumble, however once there reving there the pick of the bunch.

Order a 171 jet for the sec from your toyota dealer and you should be right.

The pixs tell the story. the size in mm is stamped on the venturi rim.

Cheers

Andy

 

are they changable? And yeh we race speedway aswell we talked on abother acc, just trying for abit more speed

You can swap pri for pri but you will find the discharge nossel for the accelerator pump gets in the way. The nossel is a press fit, if you use a 1mm drill bit as a drift you can tap it out swap the venturi and tap it back in again.

The Secondry ones pop out OK and once again you can swap Sec for Sec, but as they are about 6 mm shorter than the Primary ones you cannot swap sec or pri or visa versa.

Cheers

Andy

 

 

You can swap pri for pri but you will find the discharge nossel for the accelerator pump gets in the way. The nossel is a press fit, if you use a 1mm drill bit as a drift you can tap it out swap the venturi and tap it back in again.

The Secondry ones pop out OK and once again you can swap Sec for Sec, but as they are about 6 mm shorter than the Primary ones you cannot swap sec or pri or visa versa.

Cheers

Andy

 

Thanks mate top bloke, if ya wna no anything gimmie a pm we gotta help each other beat the dattos