No probs No Notion, when I started the removal process I had a clean Sheet of paper, a can of Carb Cleaner, a 1" paint brush, & a clean bowl under the carb when you insert the carb cleaner, these carbs are very delicate due to the size, take a close up image from your phone If you have one, place everything in line on the paper, inside the carb & at the end of the Petrol Feed Pipe there is a VERY SMALL filter, these can be had off ebay for little money that's what I done, it was here in a couple of days, you can get a lot of spares off there, for the price replace the plug, there's two lenghth's Short /Long threads, at times the end of the HT Lead is the cause which I have found, as you may know these machines can be a sod to start but once running they are a good machine, I have just re-read your post, also check your throttle cable & the button.