Problem with getting a cheap replacement carb is you have less than a 50% chance it will work. Normally, the leak or surge. You can probably get away with just cleaning the original one. There are no real bolts to disassemble it, just a 1\2" bolt at the bottom bowl or a solenoid in the same location holding the bowl on. Removing the bowl will show the float that comes right off and the needle. Remove these two and clean all the jets and holes with carb cleaner and small wires. Here is an example of a YouTube video showing the procedure. Just Google "Walbro carb cleaning" Best of luck.