carb confusion

['70 521 L16]

i couldn't really find much on google about this... maybe i should just find a weber book. anyway, i've been tinkering with it to try to figure out why it pretty much drops off around 3k rpms. i realized that only one of the barrels was actually getting gas squirted into it which was confusing, until i took out the accel pump jet which only has one side drilled out. why does the other half even hang over the secondary if it's not drilled out? does this have anything to do with the dead spot? i haven't had any money to update any ignition stuff yet either, which could be contributing to it i guess...? am i just getting ahead of myself?

 

this is what i have, and it even says down the page that it's single sided to primary only. at first i thought maybe it was clogged until i looked on the inside of it for a hole and there wasn't one.

 

 

it's a 32/36 btw

[Laecaon]

Accel pump is designed that way. Reason for haning on both sides (assuming 32/36) is that there is a right-hand and left-hand version. So they made it more a universal part and then simply drilled it for the appropriate version.

 

Read this:

http://dimequarterly.tierranet.com/articles/tech_weber_tuning.html

[datzenmike]

There is also a Weber that is synchronized to open both barrels together. Bet both are drilled out on that one.

 

does this have anything to do with the dead spot?

 

 

The flat spot could be the secondaries opening and the jet for it is too small or blocked so it's lean... too much air not enough gas.