The 6401 is sweet with a 20 inch bar. Never put a 24 on mine. Unless you are in big wood, the 20 will do fine. If you find the need for a 24 inch bar on occassion, I still do not think you need the big bore kit. Now want is a whole different cup of tea....
I agree that he doesnt "need" the kit. I only suggested it IF something were to go wrong with the top end in the near future.
As to bar length, I perfer a 24" bar. That it what I have on most of my saws. And it is NOT because we cut big wood all the time. The reason I like the 24" is because I dont have to bend over. For me, a 20" bar is harder on my back and tires me out quicker because of this.
I've never seen or even heard of Makita Chainsaws. Makita is my favorite power tool company, so I'm a big fan of their stuff already. What makes me nervous is where will you get service if you need it? if you have a place to get it worked on, then it might be worth buying. If not, walk away.
Echo is my favorite chain saw. I have to Stihl's and one Echo right now. I also have an Echo weed eater. The Echo is just night and day easier to start compared to the Stihl's that I own. When they die, I will only buy Echo for now on.
Eddie
Makita also makes a gas powered cut off saw.
We have had a Dolmar 120 si as the first saw at the VFD and it was a bunch of junk, lot of carb probs, guess they had a kind of variable nozzles, that was not working correctly.