Tomos A3 sputtering with throttle

Jason F /
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I have a 1984 Silver Bullet that I’m having an issue with. I recently installed a 70cc Airsal kit with high-compression head and a 15mm Dellorto. It ran great for a day or so then started sputtering under acceleration. It’s like it cuts out then back on. I was running a 75 jet then went to a 73 and it’s the same. I seem to be getting food flow from the petcock and the filter under the fuel inlet is clean. I put a video on YouTube to illustrate. Any ideas? Thanks

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