KX500 Smart Carb SC2 40mm testing and evaluation.

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This thread will be active for some time.
My plan is to run this carburetor on multiple bikes, including The Haas, The KtX, and the land speed bikes and who know what else..
I will also be testing at different elevations and show dyno runs.
I will also be comparing to other carbs.
I have heard so many good things about the Smart Carb I wanted to separate fact from fiction.
If you have any questions, feel free to post them up..
In the mean time stay tuned as I have a lot of work to do on this project.

You may need a Facebook account to view this vid

https://www.facebook.com/reel/1208020929850620

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Here is some documentation that came as well.

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Wrote by Oscar Cota to me:
I'm so glad you finally got that Smart Carb in your hands! Can't say enough about it. I'm not going to lie, at first I thought it was just a gimmick. I was very hesitant to get one however now I plan to eventually get one for each bike I own. Below I have posted videos of two completely different KX500's that I have.
The number 209 bike is bone stock kx500 with quite a bit of hours on the engine, V-force 2 reeds and a Zip-Ty racing pipe with FMF Turbine Core 2 spark arrestor silencer.
The Plated bike is a KX550 with 191 degrees of port timing, extensive KIPS mods, aggressive porting, V-Force 2 reeds, Power Dynamo ignition and FMF Desert Gnarly pipe with a Team Green style silencer. The silencer is a stock silencer cut short with a welded on Sparky spark arrestor.
These two bikes are as different as any big bore KX can be and the Dual Sport is very finicky to jet. However I was able to swap the same 40 mm smart carb between both bikes and they both ran great without carburetor adjustment between the two. Granted they ran even better once I fine tuned the smart carb to each bike it was on. With the smart carb, these bikes can be started very easily and idle as if they were fuel injected.
Power wise they feel amazing however I don't know what the Dyno will say. I myself have gotten to the point in life where I'm sick and tired of chasing jetting every time the weather changes or I go riding in a different area. With the Smart Carb, I don't have to touch a thing anytime conditions change and that is a big plus for someone like me who has multiple bikes and very little extra time to spend in the garage. I can't wait to see what results you get on all the different KX500's you have and especially when you take them to the dyno!
I am definitely sold on this product and I think you will be too.

Thanks Oscar for your insight.
Unfortunately, you can't click on the below pics and get a vid.
But I can tell you that both bikes started very easily.
If you want to see the vids, go to Facebook and go to your KX Guru Racing group.
On the search line, type in Oscar Cota.
Then you can easily find his vids.

Or, click on this link: https://www.facebook.com/groups/1792575 ... car%20cota

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Here is something I did not expect.
Ronnie Hawkins on FB hit me up about his CR500 experience.
Here it is..

Ronnie Hawkins. 01 Honda CR500AF, bored to 505. SC2 40mm. FMF GOLD SERIES GNARLY Pipe with Turbinecore2 spark arrestor.
Main reason is I am 5’6” 150lbs. I don’t need the powerband kick. SC2 delivers a linear throttle response throughout the entire powerband. I live at 4100’ elevation and ride between 2000-11600’ with no adjustments once dialed in. And one start kicks once warmed up at any elevation.

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Thank Ronnie.
Any bit of info really helps others decide if this is the investment for them.

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This was a question from FB user: Jim Bennett

The only problem I find with the smart carb unless they have changed the design is if the float decides not to seal gas won't run onto the ground it will fill up the engine. I tell people who run these carbs to make sure their petcock is in good shape and always turn off the gas when the engine is not running.

This was the answer from Smart Carb:

This came directly from Smart Carb: "The SmartCarb isn’t unique in its ability to flood an engine, but where it differs is it’s integrated venting feature. No external dangly hoses that may otherwise spill fuel if tipped over or should loss of float control occur.
As such float control is more critical. Check valves in the vent passages prevent fuel from flowing out while allowing air density communication in, whether flooding upright or upside down, but fuel can still get past the metering rod, albeit slowly.
For those reasons we stress the importance of keeping the fuel clean using fresh fuel line and the in-line fuel filter we include with the carb. We also stress keeping the fuel turned off at the petcock while not actively riding the bike. That’s a good habit for anyone with any carb, but perhaps more important with the SC2. A compound failure of loss of float control due to debris or carb gumming up along with leaving the fuel on during transportation or long term can cause severe flooding.
As for improvements, we have been using a much better controlling and faster responding POM style float in recent years compared to the older nitrophyl setup we used prior. "

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Here is a link to a Youtube vid that shows the principals of how the Smart Carb works.


https://youtu.be/TN8gjEJnb9Q

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6-14-23 Update..

I've been reading the directions that came with the carburetor.
There are a lot of things that would be unnecessary with someone with experience..
But that is good as we are not all on the same level mechanically or on our understanding of how bikes work.
And most importantly, there is information that is different than you would normally expect on a Jetted carburetor.
But more on that later.
I'm looking forward to get some testing started this weekend so stay tuned....