My GX200 Clone

[Doc Sprocket]

Since the Great Server Crash Of 2011 took my clone thread, I'll just pick up where I left off. There's no sense revisiting the original as easily 60% was the whole Chinese engine debate.

Those of you that did contribute to the info I sought, thanks! I was lucky enough to have saved/bookmarked what I needed in time. So- Onward.

As you may recall, I plan some light mods. I'm not willing to spend insane amounts of money on a $100 industrial engine. If I was, I'd just go buy a beaten bike.

I'll do a high-flow intake, and a custom exhaust. I was so happy with my Homemade Cherry Bomb that I may just do it again. I will re-jet the stock carb for now. On to the governor- I had planned to remove it. I'm perfectly capable of it, but how necessary is it? If I simply bypass it, and keep the revs under 5000 (valve float territory), is there really going to be a problem with detonating governor guts?

Give me your thoughts, and experiences.
KEEP your "clones suck" stuff. Thank you!

 

[r_chez_08]

Hi,
Are you planning on a new air filer?
Rob

 

[Doc Sprocket]

Yes- I'm going to ditch the stock airbox and make a new intake adapter to take a K&N, or something similar.

 

[Rustydog2010]

What do you plan on using this on? Or do you not know yet?

 

[Doc Sprocket]

I have a kart project in mind, long term. It's a little out of the ordinary, and I don't want to let the cat out of the bag yet. It will be a gokart, 4 wheels, this engine, seat, steering wheel, etc. I'm still mashing ideas around and collecting parts. The only reason I have the engine this early into the game is the price I got it for.

 

[redsox985]

Is there a was to remove the whole airbox on a clone and get a filter that would bolt onto the carb's round air intake?

 

[robbie]

I made one from a tuna can. The carburetor is held on with nuts that screw onto studs that stick out of the engine, through the holes in the carburetor flanges. If you use something smaller than a tuna can, such as a tomato paste can, you could put it on over the carb, screw it on with the nuts, and then clamp a filter onto it with a piece of radiator hose. That's just a thought, because I haven't looked at a 6.5 hp up close yet. The only clone I've messed with is the 2.5.

 

[Doc Sprocket]

It's set up the same way, with the two long studs.

 

[Doc Sprocket]

Okay, here's something. I have an unknown clone carb I got as surplus some time back. I had thought it was from a 2.5, but unsure. Last night I compared it to the factory carb on my clone. It appears functionally identical, including the same jet size, which was a slightly loose fit with a 0.292" drill bit.

Here's the two differences;

1) Factory carb has a sediment bowl, unknown carb does not. I'm not too concerned anout it, I'm a believer in inline fuel filters and would use one anyhow

2) Pilot jet- The factory carb appears to have a non-adjustable pilot, whereas the mystery carb's has a screw. Please see pic below. I'm under the impression that it would be better to use the adjustable one. Your thoughts?

 

[redsox985]

What does the air intake look like on the stock clone? I haven't had enough of my airbox off to see it? Could you clamp on a standard round filter?

 

[Doc Sprocket]

You have to buy/fab an adapter plate.

 

[Blazkowiez]

Assuming you've compared them correctly its a good choice to go with adjustable. Are ya'll just not wanting to buy a milled aluminum adapter for the clone (10-20 dollars)? I'm not quite sure what the above conversation is, clearly something honed must direct airflow more successfully than a tuna can.

 

[Russ2251]

Factory carb has a sediment bowl, unknown carb does not.

I see a bowl on both carbs...or am I screwy???

 

[r_chez_08]

He's talking about the little sediment bowl, that looks like a mini carburettor bowl, I thinks
Rob

 

[Doc Sprocket]

I can't speak for Redsox, but in my case, I'm trying to keep this lo-buck. I can fab an adapter that should work decently. As far as comparing correctly- I've compared the jets, mounting, inlet size, and hardware. I have not yet dismounted the factory carb from the engine, so throttle bore size is unverified.

 

[Doc Sprocket]

Sorry, I just caught up- float bowl is the same on both- but the factory carb has a smaller bowl that the manual refers to as a sediment bowl, I can provide a pic if need be.

 

[Russ2251]

Either a carb has a bowl or it does not.
I see bowls on both...sediment or otherwise...

 

[Doc Sprocket]

Gimme a few minutes and I will clearly illustrate.

 

[Doc Sprocket]

Okay- from this angle you can clearly see the float bowls on both. Now, please note the indicated "sediment bowl" on the upper carb. This apparently traps particulate, and can be unscrewed and emptied.

EDIT- my clone manual calls it a "sediment bowl", my GX manual calls it a "strainer cup"
EDIT2- While I was waiting for folks to react to the picture (instead, y'all scattered like roaches with the light on ), I pulled off the factory carb. Bore IS identical to the mystery carb. And the plug that takes the place of the pilot screw, kind of looks like it might be a screw with no head, and threadlocked in. Not much chance for removal.

 

[Rustydog2010]

Okay- from this angle you can clearly see the float bowls on both. Now, please note the indicated "sediment bowl" on the upper carb. This apparently traps particulate, and can be unscrewed and emptied.
with no head, and threadlocked in. Not much chance for removal.

We have a 1950's Massey Ferguson tractor, and a sediment bowl is its only means of filtering the fuel. It must work okay, the tractor is nearing 60 years old and is still going strong.