Husqvarna K750 concrete saw

[Fatboy2017]

Thanks very much for the info, no wonder it is 4 stroking at what I thought is a very low rpm, but if 4700 is the max rpm then that makes sense. I'll get it to do some work tomorrow as I have some paving slabs that want cutting up, I'll tach it up and see what it's doing. It's amazing what grief these concrete saws go through, but different abuse than saws generally. Filters never changed or cleaned seems to be the norm. This one had concrete dust above the piston in the cylinder, but surprisingly bore was not to worn and cleaned up ok, bottom end seems not to have suffered any ill effects and remarkably clean! 

[openspaceman]

27 minutes ago, Fatboy2017 said:

Thanks very much for the info, no wonder it is 4 stroking at what I thought is a very low rpm, but if 4700 is the max rpm then that makes sense. I'll get it to do some work tomorrow as I have some paving slabs that want cutting up, I'll tach it up and see what it's doing.

I've never really learned how to tune a saw or hedgecutter that has a rev limiting coil, it's generally not been a problem as I tend to blip the throttle on the power stroke with the hedge cutter. I used to have a lot of problems with the Stih BT 45 power drills at work, they invariably came back with the exhaust caked in tarry oil where unburnt  fuel had passed through when they were constantly held on the limiter.