A mystery to me By erinsdad (Read 600 times)

[erinsdad]

I have a question that has been on my mind since early summer when I put in all the performance products I could find. OK now, the scoot is a 49cc Tank. If my top speed on flat road is 40 MPH and at that point (40) my throttle turnage is half way, my logic tells me that the rest of the throttle turnage will dump more gas into the system, causing the engine to run faster, thus providing more power or speed. But we all know that doesn't work that way. Sooooo, if that extra throttle twist IS dumping more fuel in, were does the excess gas go if not to more power & speed??? Thrown out to the ground? Evaporated? Or I need a throttle explained to me in terms I can understand!!
Thanks for your time everyone!

[alleyoop]

HAHAHAHA, yes that will happen in the summer time due to the air density: If it was cold that sucker would do wheelies.

Cold air has molecules that are moving slower than warm air therefore they are closer together and the air is denser.
The denser air has more oxygen to burn so you get more bang for your buck. So you’re getting a little more energy out Of the gas you're burning and you hit top end at a lower throttle. However, the carb is set for summer air and can't use the last bit of throttle.

If you were going to continue to run in the colder air you'd have to rejet or adjust the A/F. The change in temperature from what you normally run is similar to a change in altitude except you changed the Gas densities with temperature.
Alleyoop