The jet block gasket is a known issue in old carbs or ones that have been cleaned by soaking in solvent or had brake parts cleaner used on them. Jets-R-Us has new replacements available.
I'll give you another little tip that I didn't see anyone else post about a PWK carb. Set your float height to 18mm and not the factory setting. It will make dialing in the jetting that much easier and without little weird running issues. A lot of people don't realize how much float height affects the running of the engine.
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