:disappoin :disappoin After all I did swap my 76'280z to carbeurators. I have a problem though with one of my SU's round top carbeurator. The rear carbeurator has no suckshin what so ever. One more problem my air piston is very sticky and it closes. I need help on this one.

i had a problem with my SUs like that, as far as the sticking air piston.. Try loosening the nut at the bottom of the carb and letting the needle adjust itself in the sleeve, wiggle it back and for just a bit But not hard!! maybe that will also solve the suction problem.. if not try opening the idle screw slightly..

hope i helped..

Thanks I will try it.

I would suggest either getting the "Ztherapy" SU tune up video, or getting a manual. Something with some kind of instruction on how to rebuild or take your carbs appart. Like previously mentioned your needle might be binding or it could be that your piston is sticking, either way you need to dissassemble, clean and properly rebuild.

$.02

Here's a good place to start...

http://www.teglerizer.com/sucarbs/techtip6.htm

Ok thanks for the advice I will try it.

thx guys I took all of your advice and loosened that screw and sure enough it started not sticking as much. Ian

I also found that using to thick of oil in the carb cause it to stick as well..

Really I will check that also.