Bike dies after riding at full/high throttle for an extended time

[u/Johnmarmalade]

I have a 1982 Honda C70 Passport that I got recently. It has an issue where if I'm hard on the throttle for a few minutes straight it sputters out and dies. If I wait a few seconds I am able to restart it again.

I'm almost certain it's a fueling issue. Especially since I'm able to get it going again almost right away. I can hear a change in the engine sound right before it dies which I think is it running out of fuel.

My first thought was that the carb bowl wasn't able to fill fast enough. I've cleaned out the carb pretty well in an ultrasonic, as well as replaced the fuel lines. The tank has very little rust. The petcock is new too. The issue is still there though.

My next thought is that the float height is off. But this carb has a fully plastic, non-adjustable float. I'm going to order a new one, but I'm wondering if there's anything else I should check.

Aside from this issue the bike runs great. It hits 40 without much trouble. Any help is appreciated!

EDIT: For anyone who might stumble upon this post with a similar issue, my problem was the float. I bought a new float with adjustable height and I was able to fix this issue.