- What happens when you put nitrous on a tiny motorcycle?
(motorcycle engine revving)
- No. - Oh God.
Wonder way
- Will NOS actually make this little mini motorcycle
any faster?
Or will it blow up in betwixt my thighs?
We got a whole track today all to ourselves to test it out.
I'm Jeremiah.
This is Donut.
(motorcycle engine revving)
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- This all started
when we bought a nitrous kit thinking it was for a pit bike.
- Nitrous kit for a pit bike.
(laughing)
- What?
- But it turns out we misread the ad
and the guy actually wanted to trade for a pit bike.
But in the comments you requested
that we actually make this video
so legally we have to do it.
So we got the most insane sickest motorcycle we could find
at Walmart.
So now that we have our pit bike,
we decided to set a baseline
to see how fast this thing is without nitrous.
Joey down there he's gonna check my top speed.
It's not gonna be much.
(motorcycle engine revving)
- 18 miles an hour.
- 18 miles per hour.
That's our benchmark.
Now the speed on this bike is limited by a governor.
So I only expected the NOS to improve my acceleration
not my top speed.
And in the case of this first test
I reached 18 miles per hour in 3.9 seconds.
So nitrous oxide or N2O
is what we're gonna be talking about today.
Now you know you need air, fuel and spark
for your engine to run.
Well, the air component,
we care about the oxygen percentage in that air,
which is 20%.
Now nitrous, on the other hand, it has 33% oxygen.
And when you have more oxygen means you can add more fuel
so you can make more power.
And there are two main ways
in which you can deliver nitrous.
You have a wet system
and you have a real cheap and dirty system
and that's called the dry system.
So what I've got here is a dry kit
and this little thing cost me about a hundred bucks
and runs on canisters of NOS like this.
You push this little button right here,
the NOS travels down this tube
and it goes screaming out this jet.
So what I've done is I've drilled a little hole here
so that this jet is gonna squirt high sexy NOS
straight into the car.
But here's the thing, we need more fuel to make more power.
Otherwise this NOS kit is pretty much pointless.
So I have to re-jet this carb to deliver more fuel.
Unfortunately, when I don't have NOS
it's gonna be running pretty bad.
And this is kind of why most people don't use dry kits
especially in carburetted applications.
It's just not practical.
But we're gonna try it
and see how much more horsepower we can get
with our little Coleman minibike.
Oh, look at that.
Just threading her out.
Aw, now I can put some new fresh brass in there.
Let's go install this on the bike.
NOS line routed right there.
And let's mount it right there.
I'll just zip tie it up.
This should be totally secure.
Nice.
Great.
All right boys, we're ready.
Okay, we have our stock bike here
with our dry kit installed.
Honestly, I don't think it's really gonna work that great
but I'm gonna give it a fair shake down
and we'll see how it goes.
Okay, you ready?
(motorcycle engine cranking then revving)
- All right, yeah, we got quicker.
(motorcycle engine revving)
So is it a lot?
No.
Is it sustained?
No, but you could definitely feel it in the butt.
So now what we gotta do is get serious.
Let's go put on a wet kit.
Now this is a wet nitrous kit and unlike a dry system
this will deliver nitrous and fuel hence why we call it wet.
Now because of that
it will be able to maintain a proper air fuel ratio
and make us a lot more horsepower theoretically.
But here's the thing,
our little Coleman bike only makes six horsepower
from the factory.
This thing is 40 horsepower.
So before I go
and just send 40 horsepower to a Chinese engine
and have charges just blow all the way up,
I'm gonna build that motor up a little bit.
Starting this lovely Billet flywheel.
I have a new carburetor, connecting rod, intake,
exhaust, valve springs, ham shaft.
This little bike's gonna get dangerous quick.
(upbeat music)
So I have my OEM flywheel
with this plastic contraption on the top
and here is my Billet boy.
It's much, much stronger.
So that is our governor.
That's what's limiting our top speed.
So I'm gonna pull that sucker out.
We got us a fully disassembled engine.
How long did that take?
15 minutes?
Let's see how long it takes to put it back together.
(machine whirring)
Good compression.
Now how this system works is pretty simple.
I have a fuel side and I have a nitrous side.
So on the fuel side I have a fuel pump
that's gonna pressurize the system with fuel
whenever I get ready to hit this button.
Now controlling the nitrous and the fuel are these solenoids
nitrous goes in one port here in the end
and fuel goes through the F port.
Now in a car you're gonna mount this somewhere
in your intake manifold, but on a Coleman minibike,
it doesn't have that.
So we've tapped directly into the air filter
and you can see we have our jet pointing directly
down the barrel of the carburetor.
See that little jet?
We're gonna get healthy, healthy fuel and oxygen
making instant power like that.
Okay, so right now I'm just assembling the NOS kit,
making sure I get all my solenoids wired up correctly,
all my lines, we have a fuel pump.
There are these little jets besides that hole,
depends how much horsepower I'm gonna get.
So I have five horsepower jets,
10, 20, 30, 40 horsepower jets.
I don't know if we're gonna make it up to that point.
If we were to put 40 to it it might blow up.
(upbeat music)
(machine whirring)
Dear, look at this.
This is great here.
Okay, so I have mounted our fuel solenoid
and our NOS solenoid,
I'm getting our fuel pump in place,
getting the battery squared away.
Got all our lines pretty much plumed up
and Joey is on the way back
from getting our NOS bottle filled
with sexy sweet go fast juice.
This is my activation switch down here.
So this arms my fuel pump
and now I have our final go go fast button
which I'm gonna put right here.
Those will activate our solenoids
which will squirt our nice juice right into our carburetor.
- [Joey] Yeah, that's gonna look sick
- Boys look at that.
I think look as tight as hell.
- [Joey] Hot dog.
- Great.
- Go switch
- All right, that's it.
We got our fully built out motor,
now with a custom installed nitrous kit.
I think it's time to go test the sucker out, shall we?
(upbeat music)
Okay, so we have our built minibike over there.
It's a little bit of a hard thing to start
with a crappy pull cord.
So I'm letting it warm up right now.
Since I did a full engine rebuild on this bike
and remove the governor that was limiting its top speed,
I needed a new baseline without nitrous.
This time however,
we'd be after the highest possible top speed.
(motorcycle engine revving)
- He just hit 21 whopping miles an hour
- With a new baseline of 21 miles per hour,
I was ready to reset and try this thing with NOS,
but of course it wouldn't be a Donut video
if something didn't go wrong.
I mean it's just not enough vacuum being pulled through
for it to like miss when we hit it.
- Well is the nitrous shooting?
- No, the nitrous isn't shooting yet.
So that'll help fuel out I think.
- Right.
Okay, nitrous is on.
- Oh, I think I'm just feeling this one.
So at first it felt like the solenoid was firing
'cause you could feel a click in it
but I was just feeling the click
from the other solenoid traveling through the chassis.
So this one isn't actually firing when he hits the button.
So probably just a simple wiring issue probably.
- Fingers crossed.
Oh there it is.
- Is that fuel too?
Yeah.
- We got nice little atomization of our fuel,
our NOS is firing.
Dude!
(motorcycle engine cranking then revving)
All right we got the bike started.
I'm gonna take it on track, run it with NOS.
Let's go.
- I hope the nitrous setup works and I hope he can feel it.
I hope it feels cool.
'Cause I know this has been a lot of work for Jerry
so I hope he gets a little payoff
but what do I think's gonna happen?
A lightning fast pass.
(motorcycle engine revving)
- I did it!
- And he hit 26 miles an hour.
To everyone's amazement,
the bike responded really well when I gave it some NOS,
but 26 miles per hour still wasn't fast enough.
So I decided to try it again
(motorcycle engine revving)
- Very good.
Hit 27 that time
- [Jeremiah] And again.
(motorcycle engine revving)
- Oh 28!
- [Jeremiah] And again.
(motorcycle engine revving)
- Oh he's on fire.
(engine dying down)
- [Jeremiah] Oh God!
- Run away.
(extinguisher firing)
I was just worried about you. (laughing)
I wanted to make sure you're all good.
- I heard something go (blowing air profusely)
I looked down and it was on fire.
So when it sprayed I'm sure it soaked that filter
then a little backfire produced a little...
- Hey, but you hit 28 miles an hour.
- Heck yeah!
With a little bit of tuning and some time,
dude, this thing will be sweet, man.
Hitting the NOS is really fun,
not so much when it catches on fire from a backfire.
You know what, I chalk this up as a success.
Thank you so much for watching this episode
or anything else here at Donut.
Like, subscribe, all that good stuff.
Until next week.
Bye for now.