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I know there's no junk keeping the float needles open because I had the whole assembly apart yesterday. If the float needles were worn, why would it only overflow with gas after i adjusted the float height? Also, where is the idle mixture needle I'm supposed to see carb cleaner shoot out of...

Okay, I set the float heights to 26mm and its now dripping gas onto the ground. The float bowls are tightened on, it's coming out of the throat of the carburetor. I'm guessing that the float is too low now. Once it's stopped doing that I'll spray out everywhere you said and see what happens.

Everything on the bike appears to be stock, and the diaphragms are moving as you guys described.

Originally each needle would easily move up and down when I moved it by hand and if I covered the crescent shaped vent hole it wouldn't make a difference. I switched out one of the diaphragms and now that needle goes up and down easily, but if i lift it up and cover the vent hole it won't come...

I have brass floats.

Yeah, I've made sure every single jet and passage on the carbs are clean. I adjusted the float height to what it states in my manual. The intake boots looked to be free of cracks but I can take a closer look. The throttle cable is connected and working fine. I don't think it's something like an...

Hi everyone! I've just bought myself a 1980 XS400 Special for the princely sum of $400 off craigslist. Unsurprisingly enough, it has some issues. The most pressing one is that my bike will start and idle fine, but the throttle does nearly nothing. Anywhere from 1/8 of the way open to full...