As far as I know,ALL Mac auto- oil pumps had issues.I talked extensively with Bob Johnson,owner of Bob's Lawnmower Repair in Maryland,N.Y.He said that the bar & chain oil is just too heavy for those impulse oilers.He said to use 10-30,10-40,or cut 1 gal.of bar & chain oil with 1 pint of kerosene or diesel fuel.I've had about 5 or 6 oilers on just about every saw you can think of go bad & I believe it's because the oil is too heavy.It might be OK in the summer when it tends to flow more freely,but when cutting in cooler temps it's better to either use the lighter weight motor oils,or cut it with kerosene.
As for those 610 carcasses,I could've used a chain brake about a week ago,but Bob Johnson fixed me up with a new one at a really good price.The problem with the 610's is that there were so many different variations on the chain brakes.He had to have my ser.# to know which one I needed.
I really don't need a decomp.valve on a 60 cc.sawI've got a Homelite 540,& a Homelite XP-1000 & neither one of those saws has a decomp.valve on it.The 540 is 88cc & the Xp-1000 is 100 cc.I've had 4 neck surgeries & 2 back surgeries & I'm still able to pull'em over.Lol