youzguyz
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I'm thinking two things here by it dieing when hitting the throttle: 1. Not enough gas getting to carb. Starves and dies 2. Not enough air getting to carb. Goes way rich, floods and dies.
So far, been looking at #1. More on that. If you have good gas flow coming out of the line (with petcock on prime), hook it back up to the carb. Open the bowl drain, let it empty, then put the petcock on prime again and see if you have good flow out of the drain. If so, the float valve is staying open far enough to let plenty of gas in. If it barely dribbles out of the drain, but you had good flow from the line, there is something wrong with the float valve. There is a screen that is part of the valve, and that could be clogged up.
#2: If the slide in the carb is stuck, or won't rise for some other reason, you won't get enough air through the carb and it will go very rich. Mine kept running when I had that problem, but it sounded sick when I cranked on the throttle, and the bike would not go over 30mph. You can try tapping the slide compartment when you open the throttle, but the only way to tell for sure if it is stuck, is to watch it, which means pulling off the boot between the air box and carb so you can see it.
You bought a used carb. I really doubt it was opened, cleaned and checked before they sent it out. "This came off a running so and so bike". When? How long did it sit? Who knows?
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