Hi guys, I have a Redback (el cheapo) mower that was given to me, minus the air box cover and cartridge. This mower has the Chinese copy engine. Without the air box cover and filter the mower starts and runs fine, however, when I put the filter and cover back on it starts ok but just barely idles and won't rev up, when I remove the airbox cover and filter away she goes, it has the same symptoms when I remove the filter cartridge and just put the cover back on. I have stripped, soaked and cleaned the carby thoroughly blowing out with the compressor, I have replaced the manifold and carby gaskets and the manifold spacer is in perfect condition, it's got me stumped, and ideas please.
