dolmar 421

/ dolmar 421 #3  
I'm thinking the only difference between the 420 & 421 is a cat muffler. Are they worth porting? IMHO I think the 420 is one of the best running 42cc saws out of the box and porting would only make it better. I had one an it blew 195psi and was bone stock......Great little pro grade saws...
 

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