Poulan Pro leaf blower engine not sealed, and threads are broken, how can i fix this

Question

I've been trying to get a Poulan Pro leaf blower engine to run. I had noticed that the seal for the engine isn't tight and I saw that the threads were stripped. I know compression is needed for combustion.
I tried using a simple thread restorer kit but it didn't hold. I tried a bigger thread creator, and now the original bolt is too small. (I was probably being an idiot and wasn't paying attention.) Does anyone know a way I can hopefully restore the seal and threads?
The model information on the cover is:
25cc Gas Blower
200mph
Bvm200FE
Poulan Pro

here is where the seal I'm referring to is:

the_storyteller · Accepted Answer

That gasket definitely needs to be tight. Each rotation of the engine, gas is sucked into that bottom half, squished super hard, and squirted under pressure into the top half. If the gasket isn't tight, it won't work, period.
I'd try to tap it with oversized dies (what it sounds like you did) and just find a different bolt in the large size to replace the original.
If the bolt won't fit down past the fins, could you possibly get a bolt with a different shape of head? Something like a socket head cap screw, which uses an allen key might be able to fit where a hex head bolt wouldn't.

Solar Mike · Answer

To get back to the original size a helicoil may work. BUT it depends on how much damage you have done which is unclear from the information you don’t supply.
It may be possible to repair more damage but that would mean a machine shop and welding etc.
And what leaf blower does 200mph?

Poulan Pro leaf blower engine not sealed, and threads are broken, how can i fix this

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