There are chains which do not have as many cutters per inch on them. There
is a "half skip" chain and a "full skip" chain.

With these you can have a longer bar and use the same amount of power to
cut.

Chain types...
http://www.oregonchain.com




"yddraig" wrote in message
Are there any problems when replacing a chainsaw bar say from 16
inches to 20 inches? I have a PoulanPro 3800 series and would like to
add a larger bar (occasionally) to cut larger logs. Poulan says that
the saw was not designed for a 20 inch bar (of course they do), am I
doing anything inherently risky by upsizing?


Thanks