New Carb?

[CaptCanadia]

I have a Honda clone and because it's a clone and Chinese built it must have a sh** carb. Can anyone tell me how good the carb is on there and what carb to put in? I want to get one to get a lot better performance out of the engine. Is it possible to get 10-15+ mph out of a new carb? Thanks.

 

[devino246]

The carbs are actually pretty decent. A new carb wont get you an extra 10-15.

 

[CaptCanadia]

could I replace the fuel jet and get more performance?

 

[B man]

could I replace the fuel jet and get more performance?

if other things are done first. high flow air filter and exhaust.

 

[devino246]

could I replace the fuel jet and get more performance?

No, that would just make it run like crap. Adding more fuel requires adding more air.

 

[Badot]

Not unless there's something wrong with the one in there now. With engines you can either get more air into the cylinder (turbocharge, supercharge, high flow intake/exhaust, porting, etc) or have it pull in the same amount of air more often (higher revs)

The fuel air ratio needs to generally stay the same. Running an engine slightly rich can help keep the engine cooler (just a tiny performance increase) and/or keep it from pinging (from running cooler) but use more fuel and have increased emissions (and possibly buildup in your engine) and running an engine slightly lean can help reduce emissions and fuel consumption (with increased heat)

 

[devino246]

and/or keep it from pinging (from running cooler) but use more fuel and have increased emissions

and running an engine slightly lean can help reduce emissions

Depends. Do small engines run warm enough to produce NOx?

 

[CaptCanadia]

B-Man; I have a new air filter and exhaust
Here's what I have:
http://www.affordablegokarts.com/mm...oduct_Code=AGK100-CE4245ST&Category_Code=AFC1

http://www.affordablegokarts.com/mm..._Code=A&Product_Code=AGK680&Category_Code=EX1

Badot; so to make it richer get a jet with more holes right?

 

[devino246]

Unless your currently running lean, theres no use in changing out jets

 

[CaptCanadia]

Everything carb is stock so I have no idea what it's running

 

[devino246]

Everything carb is stock so I have no idea what it's running

Does it run fine without surging?

 

[Doc Sprocket]

Then do this:

Warm up engine, shut off, remove and clean plug.
Reinstall plug, drive at WOT, hit kill switch while still flying.
Roll to a stop, remove plug, take pic, post here.

This is sometimes called a "plug chop" or plug reading, and will tell you about your jetting situation.

 

[devino246]

And to be clear, you need to drive it at near WOT.

 

[CaptCanadia]

Okay I'll do that but it's kinda tireless right now...could I do it without driving it?

 

[devino246]

Okay I'll do that but it's kinda tireless right now...could I do it without driving it?

You need to drive it to be accurate.

 

[CaptCanadia]

*sigh* Okay I'll bring this thread back when I get the thing rolling again.

 

[Badot]

Depends. Do small engines run warm enough to produce NOx?

Not sure about all the chemistry behind NOx or other emissions, but I know at the very least running lean helps stop carbon monoxide from forming. Since the molecules aren't perfectly distributed, more oxygen makes it easier for it all to completely combust (meaning CO2 instead of CO).

 

[CaptCanadia]

that kinda makes me wonder what that smell is when you start the engine. What is it? It cant be carbon monoxide because you can't smell that right?

 

[Badot]

Nope, can't smell CO. I can usually smell gas from cold engines but might just be the leaky gas caps

I know engines run rich cold (choked), but I'm not sure if when they run 'badly' due to not warming up that they would put out more CO or not. They'll definitely put out something though, they tell you at the DMV to warm your engine up before you go through inspection because of that, and I figure that car engines and small industrials probably won't be too different in that sense. I'm sure devino can correct me if I'm wrong.

 

[Doc Sprocket]

Partially, the reason you need to be up to operating temperature before a smog test is because catalytic converters have to be HOT to work properly.