Here's some equipment needed to really do thorough job of carb cleaning. Note that spray carb-cleaners in cans no longer work due to removal of chlorinated compounds (carbon-tetrachloride, tri-chloroethylene, etc.). Real fuel-system cleaners with healthy dose of PEA (mix 50/50 with acetone): - Red Line SI-1 - Techron Concentrate Plus - Gumout All-in-One - 3M Max Strength Fuel System Cleaner #08814 - Royal Purple Max Atomizer 18000 Amazon - nylon scrub brushes Amazon - 4L Ultrasonic cleaner TCPglobal - mini soda blaster I just bought an MC19 and MC22 in boxes, so will be going through this myself. I'll post where I found replacement rubber carb parts. May be more difficult in U.S. than over there.