Chainsaw Repair

I Think it comes down to really lean factory drill patterns on the Zama and Walbro.  This early generation of saws were some of the first to have to pass much stricter EPA regs and really lean low sides and Cats were used to meet the regs.  The ms200t went though a bunch of carb changes during these years to try and meet the smog regs and still run ok. The shaft actuated accelerator pump on the little zama C1? Was a great example of a crappy fix that usually had issues after a short time of use.