Chainsaw Repair

Yes unless you want to remove it then it will rev limit your saw. If modding you want the passage blocked off.

this mechanical rpm limit is for protecting the enginge when at full throttle without any load.
Maximum power while cutting should be at a much lower rpm, like 9000 rpm or so !

Just "fixing" that valve will not affect the power while cutting! Excpet you will do some porting job, that ends up at a higher rpm during normal opperation.

The valve also does not alow you anymore to do carb adjustment according to max rpm, just as every rpm-limited saw, you have to do the finetuning while cutting in wood.

As I wrote in your other thread, the 143 is the last saw you want to tune above factory specs! Not very durable even in its original setup!