Hi I'm new to the forum my name is Dave.I have 3 lawnboys I'm working on a 7021 bricktop that has been in the family since I believe the mid to late 60's.Today my brother and I picked up picked up a 5074 and a 5270 on Craigslist for $40 for both. We fooled with them and got both running.The question I have is (where to get carb kits for the 5074 and 5270.They both run but one has a small fuel leak and just want to go through and do the maintence . The 7021 shuts down when it warms up[no spark] any common problems seen on this one before?As for the air filters the had homemade air filters no letting enough air through.Where is a good place to get air filters for these as well).