Viking 1820
ArboristSite Lurker
I also have a CS 400 I drilled out the muffler, took the limiters off the carb and it really runs I buy this picco super and I cut the bumper links off. I have a breaker and a spinner I buy the 55 Link chain break them add required links and I’ve been running 62 links full chisel for quite some time. Use a Dremel to cut off the bumpers only takes about five minutes. I’m not recommending you do this. This is what works for me.Ugh....according to the Stihl site it's not available anymore. It really doesn't sound like they make a full chisel for the CS-400. I've literally researched everywhere. I surely don't want to put a chain on that's not recommended, and have a failure of some sort. Guess I'm better off staying with recommended chains and the semi chisel.
https://www.stihlusa.com/products/chain-saws/saw-chains/piccosuper/