[lnewqban]

Originally Posted by firstlog

....... I don't understand why the ktm 200 is 3 times more polluting than the honda 250. They both have 38mm carbs, the honda is an mx bike. I tend to think something else is going on here.........

"Two-stroke engines produce more pollution from:
-- The combustion of the oil in the gas. The oil makes all two-stroke engines smoky to some extent, and a badly worn two-stroke engine can emit more oily smoke.
-- Each time a new mix of air/fuel is loaded into the combustion chamber, part of it leaks out through the exhaust port."

http://www.deepscience.com/articles/engines.html