Chainbrake malfunction

[Justin R]

Hi, new here, hope you can help me with a chain brake problem.

The brake will not engage when the saw is hot.

The saw (Stihl MS660) is new to me but second hand.

Had a new brake handle fitted (old one was bendy) before I encountered this problem.

I'm milling large sections of oak so it's working quite hard and getting quite hot.

If I cool the saw down by leaving it a while or by setting about it with compressed air it suddenly works again perfectly well.

Any ideas anybody?

Cheers

Justin

[Stubby]

Its a known problem . The exhaust gasses are softening the handle . Bad design . Try a twin port muffler or mod your existing one to redirect the exhaust gasses away from the plastic of the handle .....

[spudulike]

Worth taking off the cover over the chain brake mechanism and blast it with the compressor and lube it.If it still does it, mod the outlet as Andy said, done a few now and not had any complaints..........yet:blushing:

[bobh]

As spud says, strip it and clean/grease it. Mine was really bad until I did this to it. Not 100% but a hell of a lot better.