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Discussion Starter #1
This little machine has been a beast and used hard, when it starts!

I've replaced 3 carbs over the years to get it running again.
Trying to start it now with the electric start it makes a terrible noise.
Pull start is not smooth.

Thinking about a HF predator replacement, I've seen done on here.

What modifications would I encounter?
 

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I’ve got 2 520 blowers and are quite different from each other, However one has a twin pulley engine so before deciding on a new engine find out which yours has
 

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Discussion Starter #3
I believe it is one pulley from engine.
HF Predator is 3/4 shaft

I'll tare it apart tomorrow.
If I can't get this tacumseh running.
 

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I had the same trouble with a 520.Check the exhaust valve is closing fully at top dead center. I
had one that would not start.
It was the exhaust valve staying open.
I ground down the valve,it ran perfect after.The valve stretched after getting hot.
Check U tube for videos ,easy fix.
 
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