Supercharged go-kart engine running- Honda clone- first attempt.

Supercharged Go Kart built with a 2009 Harbor Freight 6.5 HP Honda GX200 clone engine. Supercharger is smog pump off a late 80s "FC" RX7.
(Engine pulley 5") (Jack shaft driving pulley 6") (Jack shaft driven pulley 4") (stock smog pump pulley ~5")
Ignition timing set to stock (20 degrees BTDC)
Carb jetting stock, running fully choked.
93 Octane pump gas.
Clutch not installed yet.
Definitely not running right yet, but the supercharger housing itself needs to be disassembled and sealed since it leaks on the low pressure side where the back cover meets the main body.
With this much "suck" behind the carb, any little vacuum leak seems to be enough to stop the engine dead.

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Author Pred 212 ( ago)
But how do we know it REALLY works?
i mean you probably have the choke turned on. If you can start it without
the extra incoming air, you dont need a 'charger.

Author BackYard Mech - Small Engine Repair ( ago)
Hey if you do that remember the governor, it can come loose inside the
engine..... You may want to take it out.

Author Kolby V. ( ago)
I remember a story where Edelbrock used an air conditioner compressor to
make his first supercharger.

Author NOBOX7 ( ago)

Author NOBOX7 ( ago)
you need a smaller pully on the smog pump if you flip flop the pullys you
will get more air pressure

Author Adam Danko ( ago)
Lol a supercharged setup can either force air through the induction system
, or pull air through it. In this case using an old air pump from an
emissions system, pulling air through the carb would be best as the fuel
would help lubricate the pump, as by itself it has no way to self

Author Hank Gorman ( ago)
check the order of how yours is set up and how would it be set up in a car.
it would go super charger then carb not carb then super charger.

Author Faisal Abdulaziz ( ago)
its a draw through carb setup...
does it affect cold start ?

Author carholden1 ( ago)
And trust me, I've removed the governor off my Honda GX160, and trust me
Ive had that engine revving full tit for full minutes going down the beach
at about 50mph on my go kart, and it hasn't skipped a beat.

Author carholden1 ( ago)
@James West yea but it will go sooo slow and whats the point in having a
slow go kart? You might as well remove it and blow the engine up having

Author James West ( ago)
People here recommend removing the governor. Don't do it. This engine was
designed to run at 3500 RPM. If you go beyond this without putting a
stronger con rod in, you will throw a rod. The stock rod is a die casting
and will not take the RPM. You could have left the carb on the engine and
put the thermactor pump on the intake side of the carb. It will work and
provide better starting. The blades on the pump are made of phenolic and
won't withstand the spray of gas on them.

Author SchizoFilms ( ago)
If the smog pump is working like it does in the car, it should be moving
air at a good few CFM, compressed a few PSI. On an engine this size, moving
as much air as the RX7 smog pump moves, into the space it can occupy trying
to get into the engine, there will be some natural pressure buildup.
Source: former FC owner.

Author MeMad Max ( ago)
Should've done a blow thru carb setup, it can handle it.

Author nipponcarisbestcar ( ago)
That smog pump is compressing the air right? If it's just moving air but
not compressing it then it's not doing anything.

Author Yeshua77 ( ago)
“Then he will say to those on his left, ‘Depart from me, you who are
cursed, into the eternal fire prepared for the devil and his angels."
(Matthew 25:41) "For by grace you have been saved through faith. And this
is not your own doing; it is the gift of God, 9 not a result of works, so
that no one may boast.” (Ephesians 2:8-9) "If you declare with your mouth,
"Jesus is Lord," and believe in your heart that God raised him from the
dead, you will be saved." (Romans 10:9)

Author warmfreeze ( ago)
i laugh at the people that put turbos and superchargers on their go-karts
and don't change the gear ratio...way to go your gokart still
tops out at 35 mph but at least it'll get you there faster..

Author spugsautorepair ( ago)
Remove the governor on this engine. Also, tighten up your Swagelok
retainers, lol.

Author charles keeton ( ago)
Any processes or documentation of needed to go about this?..

Author Nathan Bradfield ( ago)
I think this is rad. Found your vid to reference a smog pump supercharger
for a diesel mini bike. People are idiots on here to voice their negative
opinions. Keep being creative.

Author Nathan Bradfield ( ago)
Learn how to spell carburetor before you insult, dumbass.

Author matthew mclaughlin ( ago)
probably not, honda clone will do about 30 cfm normal atmospheric pressure.
smog pump will do probably 3 psi and pull 50 cfm. not saying it's a huge
performance boost, but it's very unlikely that it's restricting.

Author matthew mclaughlin ( ago)
lmao, notice the lever sticking out under the gas tank? that is the
unhooked governor smart guy.

Author matthew mclaughlin ( ago)
there is nothing wrong with that other than the fact that it could be a bit
closer to the engine.

Author Joseph Murphy ( ago)
I bet that smog pump actually makes the engine make less power because of
restricting the air flow.

Author theroadrunner661 ( ago)
looks like a smog injection pump from the 80's would be better as a crank
case evacuation system than a supercgarger

Author Damien Gomez ( ago)

Author Cwazywazy140 ( ago)
we used to have a little 3hp b&s kart. when we got it from my cousin the
throttle was suck wide open. before we fixed it it was freaking scary. it
was kinda small too. there was absolutely nothing safe about it except for
the lack of power. once the back wheel hit a fence when i was going into
our backyard. my nuts hit the steering wheel. which btw had tons of play in
it. the first time i went on the road i went up on 2 wheels when i took a
corner too fast. btw its 1wd and rear brakes it sucked.

Author Joseph Creed ( ago)
the rod would blow the other way moron.

Author Trex Fur ( ago)
who gave you the idea of putting the fucking corborator right next to you.
dumb shit.

Author nick hill ( ago)
its all fun till it blows a rod threw your back.

Author bison299 ( ago)
maby he uses carb cleaner to pop it off lol thats what id do

Author TheGamerPalace ( ago)
Yea a nice way to blow a 4 stroke engine. You want high rpm 16000 rpm. Get
a 2 stroke. $ stroke doenst make now power at high rpm unless modified to
take the abuse.

Author California avi8tor ( ago)

Author submitcyber ( ago)
Nice be careful you don't blow a head gasket! What ratio are you running?

Author korrutustabel ( ago)
If you only disconnect the governor arm from carb and dont fix it in place
with a weakish spring then the weights in that governor gear might hit the
cranckshaft and fuck up the engine. And change this supercharger v belt for
a flat belt(dont know the exact words for this) because v belt takes a lot
of power to turn around.

Author jfo420 ( ago)
stay of the internet and get back in school. dumbest question ive heard all

Author wertheroriginal ( ago)
The governor won't do anything if the little arm isn't attached to the
throttle shaft. You don't have to tear the engine apart to disconnect the
governor, but the parts inside the engine could fly apart with increased
engine rpm.

Author Alejandro Tovar ( ago)
As in tear the crankcase open and remove the governor gear, you dont need
the carb to be hooked up to the governor for it to do its job.

Author logan pruitt ( ago)
its going to burn up the valves and bend the push rod all ready did that it
olnly lasted half a summer

Author Evolover21 ( ago)
What kinda boost you making?

Author TheYahooskin ( ago)
very cool.

Author flashygap ( ago)
what octane level would you recommend for my GX160 with a supercharger and
turbocharger (has to be 86 or higher)?

Author donyboy73 ( ago)
quite the setup!

Author wertheroriginal ( ago)
@babybaby72586 The governor isn't hooked up, look where the carb is.

Author manta106 ( ago)

Author colin kimber ( ago)
one very imprtant tip: take of the oil low sensor... when you hit a corner
hard the oil goes up the side of the engine and shuts it off

Author colin kimber ( ago)
take off the gas tank and mount somewhere else and put the blower there

Author tbens9 ( ago)
Hey I'm in the process of fitting a turbo to my Gx200, so i've done a bit
of research on forced induction. are you running the stock carbie? if so id
suggest getting a larger aftermarket one that you can adjust the air/fuel
you can get air/fuel monitors on ebay fairly cheep, also for a supercharger
id attach something like a pressure regulator in the intake manifold so
that you can at least control your max boost, you shouldn't have to run
with the choke so id say bigger pulley on pump too.

Author TeamEggmotor ( ago)
With all the extra power you might need wider tyres :) Nice project

Author NZX ( ago)
@babybaby72586 but the carb is no where near the governor, or hooked to

Author spider6837 ( ago)
im building one like this to but im taking a briggs that has sit for ages
and a 49cc pocketbike transmission and doing what no one has done, im going
to build a procharger with 1:5 ration and see if it works... some of the
parts are machined but not in running order right this second, ill post a
video soon

Author Kurtayy95 ( ago)
@babybaby72586 cool story there. So now you know not to underestimate
people :)

Author babybaby72586 (471 year ago)
@Kurtayy95 actually there buddy i built my very first racing engine at the
ripe age of 13yrs old. it was a restricted B&S flathead. i didnt build a
twin engine setup with hondas but i have done countless twin animal setups
that i have ran in the UAS series.

Author Kurtayy95 (1628 years ago)
@babybaby72586 ahaha, now you have asked. actually I have had a twin 7.5hp
motor setup on the back on my racing gokart - Yeah I set them both up so
they would be exactly the same. Yeah I'm 16 too, bet you didn't do that.

Author babybaby72586 ( ago)
@Kurtayy95 ok slick please tell me how many of these engines you build and
race per year. you see i own a business building these engines for kart
racing and mini bike drag racing so im gonna assume i know a heck of alot
more about them than you ever will. all that motor is, is a completely
stock rotating assembly, running stock cam, stock valves, stock valve
springs, and a 2 degree timing advance. that motor wouldnt hit 6500 rpm if
its life depended on it.

Author CCSinventions (1735 years ago)
@kreigsmann ats y there called a honda clone its basically exact same thing
as a honda engine except its cheap and made really low quality

Author Alistair B ( ago)
hhehey ddududdude, uur ssusupsupposed tto ppuput tththe ssuper charger so
it blos into the carb, not the way u got it. i think i will get a small
leaf blower mechanism and use that when i make a go cart.

Author Kurtayy95 ( ago)
@babybaby72586 your an idiot, may as well belt a hole in the block with a
hammer now.

Author Rancid Cocks ( ago)
did you have to alter the compression ratio for it?

Author James Dotson ( ago)
@destruxxx Changing the valve springs will not increase the RPM unless you
remove the governor, and I wouldn't call 18# springs safe without other

Author kreigsmann ( ago)
def not a honda engine.

Author nuclearturtle ( ago)
@destruxxx 18lb springs will take you way above 5500..... the 10.8 springs
are whats needed to limit the rpm

Author destruxxx ( ago)
@EngineeringFun All you need to raise the safe rev limit on a GX-200 from
the governed 3600 to about 5500 is a set of 18# valve springs that cost $4
each. They take 10 minutes to install. You need a wide RPM range if you
want to go fast, especially with a centrifugal clutch.

Author rjc862003 ( ago)
the problem with attempting to super charge these motors is a: the super
charger offen takes more power then you make b: adjusting the air fuel
ratio to make more power and not lean it out and blow it up

Author steelmesh ( ago)
Are you building any pressure? I am asking for actual boost numbers not
your theory.

Author Isjix ( ago)
Where did you get the exhaust, I want it :(

Author Tyrone Johnson ( ago)

Author Buddy Rowe ( ago)
lol @ 0:47.... one tire fire!!!!!

Author Tyson ( ago)
@pcblah i think i was the one not very observant. haha. i had been looking
at a lot of modified karts that night and most of them still had the
centrifigul cluth with a belt. i assumed this was another one. i changed my
cart over to a chain drive. much better. :)

Author pcblah ( ago)
@vaultingy most engines use belt drive for super charger but if it goes to
the axel and i was not observant the you are right haha

Author Tyson ( ago)
Lose the belt drive haha

Author triple423 ( ago)
@Fraziernrc hahahahahahahaha

Author Jrob92544 ( ago)
How much did u pay at harbor frieght?

Author weekendtotaal ( ago)
hello, what frame do you use? i want to make a go kart myself;) Thanks in

Author babybaby72586 ( ago)
lmao nice governor man you should try taking it out so you can get some
real rpms

Author Fraziernrc ( ago)
Must be a bitch to start, carb is a few feet from engine

Author poopdogsays ( ago)
2hp parasitic drain for a .25 hp gain... Mmmm, I don't see the logic.

Author 50centmnm ( ago)
how much power did it make, my NA motor is at 33hp. :) jk, it will be thou

Author traxxasrcs ( ago)
nice water pump turbo!! lmao

Author charles byrd ( ago)
lol wtf is that a smog pump

Author miketheredneckable ( ago)
that supercharger adds just enough power to make no difference with the
added weight...

Author nekbiodieselworks ( ago)
nice thought but if you push that engine too hard you will throw a rod.

Author ECioffi4 ( ago)
you should take the govenor off

Author jake3085 ( ago)
cant wait to see it all running. !!!great job!!! and that just sounds

Author muhammadisasissy ( ago)
@tsummerlin84 Depending on how fast he is turning it (it looks to be
turning close to 1-1) those smog pumps can put out fair boost on a small
motor like that.I would think it needs to be 4-1 or higher over crank speed
if he wants 5lb or more.Would have to know swept volume of pump & cc of
motor to figure it.

Author tsummerlin84 ( ago)
Ha Ha, your getting no boost what so ever from that smog pump. Shave the
head instead!

Author Afdhal Atiff Tan Amin Husaini Tan ( ago)
@88bigpapa It's a smog pump...

Author PsychoGuitarist21 ( ago)
shit will take-off

Author kaspatheghost419 ( ago)
great videeo

Author Michael Mocan ( ago)
I was thinking of attempting this a while ago, but decided to try making my
engine run EFI first. Have you measured the power increase at all? Very
interested in seeing results.

Author 88bigpapa ( ago)
i just bought a motor like that where can i get a supercharger like that???

Author XSYPXAWSOME1 ( ago)
looks like its working

Author mrmeanr ( ago)
You need to use a York 210 A/C Compressor instead... it puts out about
12ft^3/min at a couple thousand rpm.

Author EngineeringFun ( ago)
@499882 The torque increases which means the power increases
proportionally. By installing a shim between the head and the cylinder you
can reduce the compression and increase the supercharger pressure. This way
the the torque and accordingly power can be almost doubled without
increasing the rpm and having to buy extra parts. A junk smog pump is 15$
at Upull&Usave, plus you don't have to deal with all the problems of
increased RPM. I would put the smog pump before the carb though.

Author 499882 ( ago)
whats the point it will still be slow

Author EngineeringFun ( ago)
Very, very cool! That seems the way to go. How much more power do you think
you gained. I just got one of them recently. Can I install a supercharger
and a small (1-2 quarts) air buffer BEFORE the carburetor so that I don't
need to tinker with the engine (except lower the ignition timing advance).

Author floridalawncare ( ago)
All you need is 2psi boost on one of the small single cylinder engines.

Author Donald Jackson ( ago)
i have to admit that is pretty sweet

Author hyperformance24 ( ago)
even if there is no major increase in performance, there has to be some
improvment. and if not, this is still some sick shit. BRAVO!

Author BrokenDoorStudios ( ago)
its not really "supercharged" the charger in question is really just a
secondary airpump off an Rx7 so it doesnt really create much boost. I'd
love to see this completed however with a boost gauge because that pump was
only designed to push MAYBE 2psi at 8000rpm....

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