"95+mph.lol i got a wildfire 150cc moped"
Wow, annoying. Very annoying, but it puts things in perspective.
Check this out.
It's a script that calculates the air drag of a bicyclist based
on speed. The "Weight" field doesn't do anything - if you put in
"0" for wind speed and grade, you can use this to find out how
much energy it takes to overcome the force of wind resistance
(just wind resistance) to get to a certain speed with a front
surface area approximately equivalent to that of a bicyclist
(which will actually be smaller than that of a moped - this utility
will spit out a number on the low side).
So, let's try it - Tommy went 70mph. According to the widget, it
would require 4031 watts to maintain that speed against wind
resistance. That's a little more than five horsepower.
It does take some power to overcome inertia, bearing
resistance, and simple rolling resistance, so he would have
needed an engine that did even better than five horsepower
to get there.
Does that seem reasonable? 80cc kit, 24mm carb, porting,
pipe - that could feasibly put out the six or seven he'd need.
I imagine that getting it to put out six or seven horses at WOT
would be a tuning challenge, but I know Nate could do it, and
imagine the west coasters can too.
Now, 95 miles per hour would require more than 10 kilowatts,
or more than fifteen horsepower.
Is that possible with a 150cc engine? Definitely. Not the
clone of a 40-year-old Honda design that comes on a Wildfire
scooter, though.
The _best
manufacturer estimate_ of a wildfire scooter, though, says
that it can put out 6.5 kilowatts (about nine horsepower), and
Lifan-engined bikes are notoriously over-rated (literally, not
figuratively - I actually like them quite a bit).
So, no, dude didn't go 95 unless his illegal shixtbox has been
regeared, converted to water cooling, fitted with a bigger carb
and an exhaust trumpet, re-cammed, and run on nitromethane.
+++
Even more in perspective - the same utility says that it will
take about 1.5 horsepower to maintain 45 miles per hour.
That is absolutely correct - an Olympic cyclist can maintain the
1000+ watts needed to do this for a few minutes - and cycling
races regularly get up to the mid-forties in flat sprints.
That's clean horsepower, though, and your two-stroke engine
is not - a 1.5 Maxi doesn't put 1.5 horsepower on the ground
at full throttle, but the people who've tuned them up (above,
bunches of them) can get them to.
I believe 45. High sixties into seventies are plausible for top
of the line setups.
Now show me a ton.