honda clone clone build-20hp

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Monkeys1990

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ok so i want to build a go kart that goes 80-100mphs... i got the engine and the frame and a back up frame, here the list of upgrades i want to do and its a honda clone. i ust want to know am i missing anything or is there something i could add? this should get me to 18-20 hp or so.

22mm Mikuni - Gas (+$30)

T3 Flattop, genuine Honda (1.0mm Rings) (+$45)

12.5 to 1 (18 cc head) (+$80)

307 0807 camshaft

ARC Billet Flywheel (+$90)

Roller Rockers (spacer not included) (+$80) 1.2 Billet Rocker Arms

Chrome Moly Pushrods

Stud Kit

26 lb Springs,

Lash Caps

8 degree Timing Key

Billet Rod

Billet Guide plate

900 dollors total.
 
J_Walker

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Wouldn't it be easier to buy like a twin motorcycle engine? for even $500 dollars, you could get a air cooled, push start, 500cc engine, with like 50 something horses.
 
itsid

itsid

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Any bike engine is cheaper and will outperfom a gx200 with almost any modification.
(maybe no turbocharged efi mods...)

So excuse me, when I say... that sounds like the wet dream of a 13 year old more than a reasonable idea.

Think about using a lesser modified 14cc head, higher compression and valve clearance.
Get the "right" flywheel (ARC with timing hub) and scratch the timing key (it'll sheer off at the rpms you need to get 20 horses running)
Also you can set timing where you want it to be (and change it if you need to have mor lowend power)
A 22 mikuni is at it's limits with the amount of rpm you want to achieve there,
so you might need a 24 or even 26.
Also you need new bearings.
And you need a type 40 T/C or a horstman clutch to get the power to your wheels...
And that's where you hit the 1k mark, the magic mark where you could as easily get a outlaw mod build by a professional. (18-22hp)
Or, for something like half of that a nice two cylinder aircooled jap Motorcycle engine
with sometihing like 50 horses and 12k rpm or for about the same amount a racing kart engine with 125cc two stroke and 40+ horses @20k rpm.

So, I'd suggest either a lightly ported 14cc head (50$), the std length arc con rod ($60)
the flywheel you're talking about($90), a 4 or 6 degree key ($8), and some 18lb springs ($12) e140 tube with jets ($12).
that'll be around 12-15 horses with a little over $230

Anything more and another motor will be your best option.

'sid
 
jandj

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Post some pics of the frame you plan to go 100mph on. (I can't get the image of some 2x4's lying by a dumpster out of my mind..... ;) )
 
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and also if someone can show me a good place to buy the parts if nrracing aint good enough and maybe show me something that can teach me how to learn about upgrades, i can put them in i just dont know what most of it means, thank you
 
OzFab

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With those wheels, you'd need 3:1 gearing & the engine to rev to at least 7500rpm (almost unheard of) to reach 80mph. IMO, that's never gonna happen; if you use a clutch (even a high torque racing clutch), it'll burn out before you get moving; if you use a cvt you'll destroy the belt...

If you care to prove me (& all these other guys) wrong, I'll happily eat my words...
 
itsid

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an offset kartframe...
nah, there's not much fun in left turns only ;)
And with that much power it's never competitive with a straight rail kart on ordinary kart tracks (it'll rule on oval tracks though)

@Fabroman, There's a video on youtube where a gx200 is modified for 9000+ rpm dragrace something, can't find it anymore, the cost afair was beyond 2k.
So it IS in fact possible, but very -let's say- special ;)

And again, getting 20hp off of a clone is hard to achieve even for professionals
This isn't something an unexperienced hobbyist should try at home ;)

'sid
 
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Monkeys1990

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so why is it when someone askes for info they just get told its not possbile? when its been done befor many of time on go karts just like this and theres a track that runs these that does 60-100 mphs?
 
OzFab

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Monkeys1990 said:
so why is it when someone askes for info they just get told its not possbile? when its been done befor many of time on go karts just like this and theres a track that runs these that does 60-100 mphs?
Click to expand...

Can you show us examples of these karts? I've seen 2 stroke, single speed karts that will do 60mph but not 100mph...

The simple truth is, we're stating facts
FACT: A 4 stroke engine will not rev as high as a 2 stroke unless you throw thousands of dollars at it
FACT: High gearing kills clutches.

What most of these guys are saying (& I agree with them) is that it's more financially viable to use a dirtbike engine; I was merely giving a couple of reasons why it's the favourable option.

As stated, if you want to throw a few grand at a clone & prove me wrong, please feel free to try it...
 
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It may be better if we new exactly how you intend to use your kart setup. Are you going to run on a gigantic track, slowly bringing it up to top speed so you dont melt the clutch, Then run thru a speed trap to get a top mph figure? Or are you going to run on a sprint track that has tight turns so to purposly controll the speed? Or are you going to run on a dirt oval like I did all those years? Thats what your kart is designed for. Or are you going to run off road like alot of people do here? People here are trying to help you! If you show me people running 130mph on dirt oval karts, I'm gonna show some people that are going to die. Dont get mad, just get real and the folks here will help you.
 
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philip metzner

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I ran open 4 cycle on a 1\5 mile dirt oval. My modified briggs would turn just shy of 9000 rpm. I was just playing with the speed calulator. I ran a 12 tooth racing clutch with 11\700 rear tires. The fastest axle gear for that track was around 68 teeth. The calculator says 52 mph at 9000 rpm. Shure if I drop teeth off the rear she would go faster straight down the road, to a point, but I would have to drop to 44 teeth on the rear to do 80.
 
Doc Sprocket

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Monkeys1990 said:
so why is it when someone askes for info they just get told its not possbile? when its been done befor many of time on go karts just like this and theres a track that runs these that does 60-100 mphs?
Click to expand...

How many of these hyper-speed karts are shifter karts? These machines have a high-revving bike-type engine and transmission. That's two major points right there- an engine that is designed for high RPM, and a gearbox that will allow incredible road speeds without nuking a clutch.

Do realise that when you have only ONE gear ratio to play with, speed and acceleration are a compromise. You can't have both without reaching WELL past feasible. The reason you have been getting the answers from us that you have, is that what you are asking is not very feasible.

Now- you have a choice here- you can accept the comments and suggestions you've gotten from our good membership for what they are- good, practical comments from good guys that have some understanding of these things and are trying to steer you in the right direction. The alternate option is for us to go ahead and lie to you, stroke your ego, and sit back and probably watch you fail. Frankly, we'd rather not.

Your call.
 
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mckutzy

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Do tell....
We're all accepting of the actual facts, present them and we will listen. Other than that were going off our own experience... some of us decades.
 
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