Chainsaw Repair

I am getting quite confused here now by that early 1990s advice to dealers.

Using a double (thick) gasket will of course lead to a larger squish and less compression + raise all the ports. Unless the design was faulty from the outset (piston hitting cylinder roof), I find it hard to believe this would improve the performance of the saw. 

Now I know that really high compression tends to be over rated on certain chainsaw forums, but I don't believe that is an issue in this case?