01-20-2010
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Senior Member
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Join Date: Oct 2009
Location: Gloucester, MA
Posts: 498
Rep Power: 3
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On a diesel, your engine will run away because more "fuel" is getting into the cylinders than it should. "Fuel" can refer to anything flamable but the likely culprits are diesel and engine oil although there have been cases of all sorts of other things including propane in the air.
If it is diesel that is doing this, there is something wrong with your fuel system. It has been too long since I have looked at a YSM-8 so I can't remember exactly what can go wrong.
If it is oil, it either comes in through the air intake or past the rings. For it to get into the air intake, usually you have a turbo or supercharger that needs new seals. To get it to blow by the rings, you just need a worn out engine, this was very common on the old cats. Something that would be a good first check is to check the oil level and check for dilution (blowby will cause dilution). If you haven't seen a lot of blue smoke, it is unlikely that this is the problem. I have never seen an engine as small as this run away from blowby.
When you tried to shut it down, did you try shutting off the fuel supply? It is likely a fuel problem and it could be as simple as a broken throttle cable. I would start by disconnecting the throttle cable and checking throttle arm movement. Once you have checked everything out as much as you can with the engine off, try starting it but be ready to shut off the fuel and if that doesn't work, have something really sturdy to shut off the air with. It doesn't sound like it really ran away from your description but if it does, you need to get it smothered fast (I don't recommend a fire extinguisher due to the damage it will cause with corrosion).
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