72 521 carb issues videos

[konig209]

I just rebuilt my carb on my 72 datsun but it dont seem to wanna work right at all. Here are some vids of what its doing

 

https://www.youtube.com/watch?v=jstkV-tR9pE&feature=youtube_gdata_player

Its starts right up but i dont get it

https://www.youtube.com/watch?v=PGNQSyFvg1k&feature=youtube_gdata_player

[konig209]

What is that needle called and what is it supposed to be at? Or how many turns out?

 

And in this pic this screw

1 the hole it goes into is stripped

2 the screw under the pump is stripped.

And wasnt able to come out for the rebuild.

 

do you guys think this carb is still good or nay?

All help is greatly appreciated.

['70 521 L16]

does it idle ok? it sounds like its stumbling when you open it up which is probably due to a lean mixture (not enough gas). look for some diagrams and find your mixture screw. just for a ballpark setting, set it to idle around 800 rpm (idle adjust screw), and turn the mixture screw out and see if that sounds any better. you want the mixture screw out just past where it starts to sound like that. this is of course the first in a long list of things that could be going on. start with this. that plunger looks like your accel pump which could also be the problem _{...........getaweber......}

[konig209]

Thanks the accel pump gets air in it but not sure if its causing the problem. I want a weber but dont have the cash :-/

['70 521 L16]

try holding it down tight and revving it. that should tell you if its just because those screws are strippped out and not getting good enough suction.

[Gibby]

ive been having some issues with my truck stumbling as well. carb just got rebuilt about a month ago. starts right up but when cruising it will just stumble a bit. it doesnt happen all the time. every now and then.

[konig209]

Well i pressed down runs a bit better going to get a small screw and nut in there to regain presure.

[banzai510(hainz)]

stock carbs once bad are best to be thrown away

 

The mixture screw with the brass tenssion spring is the mixture. I sauy turn it in all the way gently then turn it out in 1/2 increments to see what happens. More than 3 fulls turn I think somthing is wrong but try it.

see what happens.

[konig209]

Thanks for the tip