Bogs down in 1st gear

having trouble with 1 st gear, when i first start out it bogs down and goes real slow, then the rest of the gears are fine. However, if you give it a little extra throttle before engaging the clutch, it is fine. We have clean the carbs and adjusted them, put a new ignitor on, high performance one. Still the same thing
Any suggestions?

How does it idle?

Sounds like the Weber progession ports. I gave money to a Weber guru who solved my (other, nonrelated) carb problems. When he was done, I had a 2367 CC type 4 with dual Webers that idled so low (like 500 RPM) that the alternator light came on. We re-adjussted to 650. My message - in this age of fuel injection, you may need an old fashioned air-fuel expert who doesn't use a computer.

Maybe accerator pump diaphram or adjustment? If it were anything other than a Weber that would most likely be it. With Webers, look to an expert it seems.

Maybe accerator pump diaphram or adjustment? If it were anything other than a Weber that would most likely be it. With Webers, look to an expert it seems.

Again......how does it ldle?

If the idle circuit is running too lean to start, it'll hunt a little bit (vary idle speed up and down just a little at will) and sometimes stall at idle. It may also have a vacuum leak, causing idle speed hunting and often running the idle speed up higher, then coming back down again - all indications of running lean.

When running and sitting at idle for 10 seconds or more, it'll bog off idle like mad - almost like it's going to stall, and generally act like you describe. Several cures are things like clearing a clogged idle jet (or more than one), re-setting your accelerator pump stroke for a richer squirt, checking for and eliminating a vacuum leak, or going to larger idle circuit jets.

But it all comes down to, How does it idle?

idles fine, no problems there