Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
No gas leak , where gas could be leaking out ans igniting? Vent should not get hot enough to melt! Is this the aluminum vent or a composite breather? Has it done it more than once?
Composite breather, (plastic) not metal. Vents around cylinder heads open and not plugged with grass?
The engine exhaust is not leaking into this area, letting it get to hot?
I had one with a fuel leak, and the gas would ignite and ruin the breather, but that is the only one I can recall.
I can opt out and see if anyone else will answer. Sorry.