No shortcuts here. If you R&R'd the carb and cleaned it, then put it back into service using the same fuel that was in the system, you completed what is known as "practice". Now you can do it again, in less time, minus the shortcuts! BONUS!! If the low speed jet is fouled (likely) no amount of magical potion will clear it, you'll have to repeat the cleaning and make sure ALL the old gas is gone, and start with FRESH, non-ethanol fuel. Any time you introduce ethanol into the system, expect problems. My Yamaha is a 2003, it DOES NOT tolerate ethanol. ETHANOL= PROBLEMS.
You can find non-ethanol fuel- google "real gas". Any small engine benefits from avoiding ethanol, it's worth the effort to obtain non-ethanol product in just the saved maintenance headaches as you're already learning. If your use is irregular, it exacerbates the problem. Ethanol that's idle for weeks will absorb moisture, phase separate and form orange snot. Just a pinprick amount of it clinging to the wall of the idle jet is all that's needed to create havoc in the carburetor's ability to deliver fuel properly.
If you possess basic mechanical skills and can remember a few steps, you can do the carburetor cleaning. It's not rocket science, but it must be done meticulously with no shortcuts. Let us know the vintage of your Yamaha. I could offer detailed instructions if the carb is close to mine. Armed with that knowledge, you're at least not out of business when it happens, since the carb can be torn down, cleaned, and reassembled without new parts if done carefully.
