I bought a 2nd hand Victa Commando with a B&S XM50 4 stroke engine.

The engine purrs along but the difference between idle and flat out RPM doesnt seem very much; what should i look for as the cause?

When the mower is running it vibrates pretty badly (horizontally) so I think the blade/cutting disc is out of whack. I've removed it from teh crank shaft and checked it- no major damage, cracks (even on the blades)etc. When looking in teh back of the mower while it runs i can see the edge of the disc the blades mount on is not steady; is this disc meant to be eliptical?

Lastly, the air filter was totally scunged up when I got it so I pulled the filter and carby off and cleaned the lot out. The air filter doesnt seem to be correct, there is a foam pad fused to some mesh but it doesnt seal the carby air intake off, the foam/mesh pad has printing on it mentioning a paper filter...

Any help would be great- I'd preffer no tto take it to the repair shop since I'm trying to keep the $ down.
Thanks in advance!

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-=kHAn=-