I recently picked-up a 1969 Evinrude Sportwin, 9.5hp motor. The motor starts easily and idles great. It also will go into gear and run as long as I don't apply much gas to it. The problem is that once I increase the rpm's, by giving it some gas (turning the throttle anywhere from "start" and higher), the engine stalls. However, I have discovered that if I put it in gear then open the choke, I can then give it gas and it runs at the higher rpm's without any issues. I'm guessing I'm dealing with a carb problem but I'm not sure. I should also mention that I gave it new J6C plugs and a fresh tank of gas to rule those things out. Has anyone seen anything like this before? Is there anything specific I should be looking at to fix the problem? Thanks in advance for any help you can offer.
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