the problem was actually with unleaded fuel.. The lead used to provide a kind of lubrication and also used to help stop the valve seats wearing in 4 stroke motors (a kind of cushioning effect when the valve closed). that's why you'll find a lead alternative that you can add to unleaded fuel for some older motors.
As a 2 stroke doesnt have any valves its fine to use either fuel. "If anything leaded is probably better as long as the octane rating is the same or higher".
The problem with putting leaded fuel into an unleaded car is that the lead stops the catalytic converter working(2 strokes don't have catalytic converters).
As a little footnote we used to get unleaded fuel and then top up with leaded. the result is that the lead raises the octane of the unleaded even further. I used to use 70% unlead to 30% lead fuel. A kind of cheap hot mix.
[This message has been edited by Bowman (edited June 19, 2001).]
[This message has been edited by Bowman (edited June 19, 2001).]
[This message has been edited by Bowman (edited June 19, 2001).]