Thread: Old concrete cutter project/parts Machine

This is not a woodworking tool so It probably shouldn't be in this forum but then I don't know where else it should go because even though it's based on a chainsaw its not a a chainsaw either. At this stage it's more of a curiosity that others might also find curious.

It's a 90cc Stihl 510 concrete cutter and was given to me to play with by another forum member who found it in a skip full of building rubble.
I needed another project like a hole in the head but I find stuff like this a bit of a challenge and can't resist playing with it.

As you can see the blade has flipped over because a couple of locking bolts have come loose. I don't know if this happened while it was running but if so it would have been pretty scary.





On the surface, apart from the blade, it doesn't look that bad but tipping it over and tapping it with a hammer released a 1/4 of a bucket of rust mainly from the blade/housing and the exhaust.

Inside it is even rustier and below is the air filter and it is also what the exhaust was like.
Apart from these two items and couple of hoses that have perished its all present and nothing is physically damaged, its just gunked and gummed up in every way possible.
The alloy parts are pitted and corroded in places but its not boo bad and have git things going that have been a lot worse than this.


Just about every, screw and hex bolt has the head full of hard cement so undoing these has been a slow and patience sapping process. Everything got liberally doused in CRC and left overnight. The slotted screw heads were scraped out with a hacksaw blade and the hex screws were cleaned out with a chainsaw file sharpened to a chisel point. So far I have managed to get all bar two hex bolts undone on the wrap handle. The most difficult were the two hex bolts on the muffler but I just got these off. The exhaust port was full of rust which I cleared and this has released the piston and I can see it will turn over (even though I haven't done that) which means it has not seized.

So why am I doing this? Well it's more of challenge to see if I can get it apart, If the piston and cylinder are OK I might even see if I can get it going. If it goes, getting hold of an air filter and muffler to restore it is not that hard as parts are still available for this model.

If it doesn't work, many of the parts will fit an old Stihl 076 chainsaw that I have that is still in good running order.