jetting

I can have this engine for 300 dollars. What engine is this and are they fast? Any mod options?

Ok so i have got a vm16 carb on the bike it came with a 85.5 main jet i think it was bogging over every range in the throttle i went to a 61 size main jet and it runs alot better from idle to about 3/4 throttle i saw this on another thread soem said this My carb came with a 70 jet in...

Hi, just a quick question.... What is the difference between the carburetor jetting and the fuel/oil mix ratio? As I understand, the jetting is how much fluid enters the engine and the mixture is the composition on the fluids? How does this affect the rich and lean running conditions...