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Post by hippo008 on Apr 29, 2022 17:51:04 GMT -5
I finally cracked and bit the $700 bullet, I placed an order for a 28mm Smartcarb SC2 through ScooterSwapShop today. I'll be updating my experience purchasing, installing, tuning and using the carb inside this thread.
For such an expensive carburetor I want to document the full process for others to hopefully make an informed decision about the value and merits (or lack thereof) of the Smartcarb SC2.
I supplied SSS with detailed information about my engine, its setup and my suspected operating conditions. I paid just about $650 shipped for the Smartcarb with an estimated two week leadtime.
More to come.
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Post by benji on Apr 30, 2022 12:28:12 GMT -5
Nice. Why did you buy it through sss? Technology elevated sells them direct I think. I've been thinking about this for a while.
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Post by benji on Apr 30, 2022 12:31:37 GMT -5
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Post by lunatuck on Apr 30, 2022 13:18:51 GMT -5
What engine is it going on? I just wonder if our 50-70cc's are a bit too small for the sizes offered. If I thought I'd get increased performance out of it, I'd buy it in a second.
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Post by benji on Apr 30, 2022 14:23:40 GMT -5
What engine is it going on? I just wonder if our 50-70cc's are a bit too small for the sizes offered. If I thought I'd get increased performance out of it, I'd buy it in a second. they actually carried a 25mm for a while, but no longer list it. They specifically listed scooters for it too. But, if it works, 28mm should still be a decent size. 24 mm to 28 mm is starting out sizes for race builds, and I would think that one of these carbs would be best used for a race build. Here's a link for a 26mm 👀 smartcarbfuelsystems.com/product/26mm-sc2-smartcarb/
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Post by hippo008 on Apr 30, 2022 15:04:58 GMT -5
To answer some direct questions
I purchased through SSS for two reasons. The main one is customer support. I have purchased most all of my dio parts from them and they have been willing to help me because of that. I want to keep a relationship with SSS because I know they will stand behind the stuff they sell and support the end user. That isn't to say the SmartCarb people won't support the end user, I just don't know them.
The engine is a AF16 with flowed cases, 50mm bore with some pretty serious porting, 44mm Mini stroker crank, Overrange CVT, NCY racing ignition, big valve intake with carbon reeds and a NCY pipe. The pipe may change to a stroker pipe or over the tire pipe from TWH. I expect to be maxing out at about 10,000RPM and I live at sea level. It's a ported built 90cc setup basically.
Honda carb sizing is weird. In any other similar build I wouldn't run past a 21mm roundslide like a Polini CP or Dellorto PHGB. Hondas really like the big carbs, it's sort of building tradition. I think it's because of the bad intake ports on Hondas. With the intake being off the side of the crankcase you get very poor filling. With a larger size venturi you help compensate for that filling problem. I've run 28mm carbs on a Corsa w/ arrow pipe with no real issues. OK Temps, great off the line, etc. Additionally I consulted a local Dio guy and he runs a 28 SC2 on his built mini stroker and swears by it. It's his favorite setup out of all his builds.
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Post by hippo008 on Apr 30, 2022 15:09:24 GMT -5
What engine is it going on? I just wonder if our 50-70cc's are a bit too small for the sizes offered. If I thought I'd get increased performance out of it, I'd buy it in a second. I am not expecting to see any performance gains. I purchased the Smartcarb for a few reasons. Mainly is ease of use, I really love the concept of a "set and forget" carb. I really don't like carb tuning and find it frustrating, especially with New England weather. I also like the concept of the zero spill design. Dios use a vacuum pulse fuel pump. It's VERY efficient, so much so it's not uncommon for the carb to become overfilled and fuel to push its way past the float bowl. Lastly is it's claim to greater fuel economy and atomization. With a small gas tank and a 28mm carb these engines are thirsty, adding additional ride time would be awesome.
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Post by pete130 on May 6, 2022 3:32:19 GMT -5
What engine is it going on? I just wonder if our 50-70cc's are a bit too small for the sizes offered. If I thought I'd get increased performance out of it, I'd buy it in a second. I wonder that as well, im still not sold on them for price, im lucky I live at sea level no hills for 500km so I only have to jet once I have a lectron its a 34mm way to big for my rc-one 94cc but a mukini 35mm works well if you stay up high rpm, im old school and give me a mukini or pwk any day, they seem to be going towards bolt on don't have to tune. I don't like that
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Post by pete130 on May 6, 2022 3:35:22 GMT -5
What engine is it going on? I just wonder if our 50-70cc's are a bit too small for the sizes offered. If I thought I'd get increased performance out of it, I'd buy it in a second. I am not expecting to see any performance gains. I purchased the Smartcarb for a few reasons. Mainly is ease of use, I really love the concept of a "set and forget" carb. I really don't like carb tuning and find it frustrating, especially with New England weather. I also like the concept of the zero spill design. Dios use a vacuum pulse fuel pump. It's VERY efficient, so much so it's not uncommon for the carb to become overfilled and fuel to push its way past the float bowl. Lastly is it's claim to greater fuel economy and atomization. With a small gas tank and a 28mm carb these engines are thirsty, adding additional ride time would be awesome. I didn't realy know much about them and ok of your worried about fuel usage, and not having to tune, I live at sea level and no hills for 500km so im lucky jet right thats it, only have wet and dry, not so much hot and cold its all hot lol and I don't think fuel use is in my book rc-one 94cc 35mm tmx mukini race fuel so that's at $8/L and yes it can empty a tank very quickly
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Post by repherence2 on May 9, 2022 22:06:13 GMT -5
What engine is it going on? I just wonder if our 50-70cc's are a bit too small for the sizes offered. If I thought I'd get increased performance out of it, I'd buy it in a second. I wonder that as well, im still not sold on them for price, im lucky I live at sea level no hills for 500km so I only have to jet once I have a lectron its a 34mm way to big for my rc-one 94cc but a mukini 35mm works well if you stay up high rpm, im old school and give me a mukini or pwk any day, they seem to be going towards bolt on don't have to tune. I don't like that
pete130 install a venturi divider on the 35mm mikuni and watch the game change. the divider is a game changer on the D slide OKO pwk for sure.
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Post by 65grendel on May 10, 2022 5:58:14 GMT -5
Venturi divider? Available for purchase? Anyhow I’ve been chomping at the bit to get one of these smart carbs I can’t wait to see if it fares any better than the electron carbs.
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Post by benji on May 10, 2022 9:16:32 GMT -5
install a venturi divider on the 35mm mikuni and watch the game change.  the divider is a game changer on the D slide OKO pwk for sure. I've never tried this but always kind of wanted to try. Seems like it could work or not work at all.
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Post by hippo008 on May 14, 2022 19:48:01 GMT -5
A short update.
If you go to the SmartCarb website they show some models with fun anodized float bowls. I sent SSS a message about getting my float bowl in the orange color to match the Dio Baja's color scheme. They got back to me quickly and said that Technology Elevated only offers larger sized carbs with colored floatbowls. The 28 and 26 only come in black. This is a bummer for me, for $650 I would hope they would offer this service for any carb they sell.
I also got an update on delivery for my carb. I'm looking at an additional week out from the quoted two weeks. This isn't much of a surprise, I was warned when I ordered that Technology Elevated was behind on orders and my order could be delayed. Apparently they have been inundated with orders and have had a hard time keeping up with demand. I don't see this as an issue because both SSS and SmartCarb were very upfront about leadtime expectations.
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Post by 65grendel on May 14, 2022 20:11:32 GMT -5
Like Henry ford said you can have it in any color you’d like so long as it’s black.
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Post by pete130 on May 18, 2022 3:31:51 GMT -5
I wonder that as well, im still not sold on them for price, im lucky I live at sea level no hills for 500km so I only have to jet once I have a lectron its a 34mm way to big for my rc-one 94cc but a mukini 35mm works well if you stay up high rpm, im old school and give me a mukini or pwk any day, they seem to be going towards bolt on don't have to tune. I don't like that
pete130 install a venturi divider on the 35mm mikuni and watch the game change. the divider is a game changer on the D slide OKO pwk for sure. I will be doing that for sure thanks for the advice I do have a lectron but I think its to big 34-40mm but has a 4-2 rod and its ment to be just change to a 2-2 rod for size of motor but ive been told by a few people the 34mm is to big for 94cc yet the 35mm mukini seems as if its going to be good, ok maybe more high revs but im thinking of maybe power jet to be able to use a smaller main jet and power reeds, ivefound if tou have a power jet carb with power reeds it's a lot easier to tune a big carb to small motor, it's all a trile and error
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