Here ya go 610 fans, a little low down on the most bad mouthed saw of all times.
These things sold for about $225 when they first hit the market,with a 20 bar but later sold for $169 at K-mart with a 16" bar,on sale.
They weigh in at 17.3 lbs or several pounds heavier than say an 038 Stihl.The oilers will oil any length bar the saw was designed to run,in this case a 28" but I don't recommend one that long.It does a 20" real well.
The oiler is a diaphragm type that works off of impulse pressure plus a thumb over ride.The flow is controlled by a screw,clock wise decreases flow and vica versa.You can find the oilers on e-bay from 10 bucks to nearly 30.I just bought 3 for 10 a pop,brand new.
If the auto portion of the oiler goes bad the saw will suck oil into the crankcase and plug the muffler screen,not good,tough on the piston.
They aren't a bad saw for 60 cc.They have what seems to be more grunt than most saws of that size and just a tad slower,rpm wise.
I've seen them on e-bay go from 35 or so bucks to 175.I got a real clean one for my son for a tad less than 50,with shipping.It required a new ignition,about 30 bucks from Fayetteville.Not bad,$80 for a saw that most likey will last 30 years with proper care.My personal 610 is that old and although not used much,still is a good runner.
Edited after thought: Often times the rewinds get over wound which causes the spring to bind and non retraction of the pull rope.A real nuisance .Of the many I've worked on,this plus the oilers and the ignitions are the most prevailing problems other than gummy carbs and broken fuel lines.