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
Poulan Pro

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

engine seal zoomed out view of engine

  • Which seal? Are you taking about the head bolts? Commented Feb 4, 2021 at 20:34
  • 1
    @the_storyteller i'm going to add some images so you can see what I'm talking about as I have no idea what most of the part names are. I'm completely new to this stuff. Commented Feb 4, 2021 at 20:41
  • An indication of the size of the original bolts and the new thread diameter should be helpful
    – Martin
    Commented Feb 4, 2021 at 20:48
  • @Martin, I am unsure of the original bolt size and thread diameter, I am a noob at this stuff and I have no idea what i'm doing. Although I will try to get as much information as possible, I am still learning how to do this stuff so try and bear with me Commented Feb 4, 2021 at 20:59
  • Do you have a more zoomed-out picture too? I can't tell for sure what the thing in the upper half of the picture is. Commented Feb 4, 2021 at 21:00

2 Answers 2


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.

socket head cap screw


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?

  • i'll add some images so you can see Commented Feb 4, 2021 at 20:38
  • @SolarMike, looks like 200 mph is the wind speed it produces ... like an F5 hurricane. :) Commented Feb 4, 2021 at 20:41
  • @SolarMike, all I did was increase the diameter of the hole. Commented Feb 4, 2021 at 20:58

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