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Pre-ordered my cast APT smartcarb today

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#261 · (Edited)
To early to tell how these work, either way and specially on the BB engines making High HP & TrQ. The billet one we received came from a reputable member, one that everyone would recognize, with a lot of racing experience over many years, and NO it is not someone who freequents the forums.

The test he performed was limited to a Sphynx 363 BB engine making +65 HP on Race Fuel. The tests performed was to run the Sphynx with the 40 MM Keihin and then switch over to the Billet Smart carb....he tried all the combinations, spent time on the phone with the techs at Smart carb, got different parts from Smart Carb to try, and at the end he could not make it work. One one his comments was the Sphynx 363R was always running lean, fuel starved no matter what he did or what Smart carb provided for him to test. He also said the Keihn 40 MM clearly produced more HP and overall power than he could get out of the Smart carb.

Now I am the first to point out that this was only tested on a Sphynx 363 and no other engine. The tests were limited, not broad, and that the person doing the testing said he did not have the time to play with the Smart carb anynore than he already had. Does this mean the Smart carb is no good, no it does not. What it means to me is a lot more testing needs to be done on a variety of engines before we can determine the effectiveness of the Smart carb.

IMO the 'jury is still out' on the Smart carb....

Carlos
 
#262 ·
It surprises me that the cast version took so long to come out and the billet versions have been out for some time.. How hard can it be if, and thats a big if, the billet version was a proven winner, is it to duplicate in a cast version?? Maybe they are correcting some of the problems that some have found with the billet version and incorporating their findings and fixes into the newer cast version..It sure would be nice to have some communication from APT on this.. If they can send emails out putting us off for months.. Then an explanation into our investment(for which we havent seen no return yet)should not be a lot to expect. Im glad to see there are some good reviews of it. Im waiting for a bit.. If I can not get it to run the way its suppose to then I will just send it back..I will not accept a once you run it you bought it type policy on this. If thats their position on it, then they can keep it IMO.
 
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#263 ·
I feel there is going to be a lot of broken hearts about the smartcarb. Every few years another carb pops up claiming the same "more hp and superior fuel atomization" speech only to be proven false. Just like a shooting star they disappear as fast as it showed up. How anyone can shell out 400 bucks for one without multiple positive results from proven engine builders is beyond me.
 
#264 ·
Do you think they're going to give the first batch away to get those "multiple positive results"? You have to start somewhere and not everyoe is afraid to spend money on things. Some people would say it's just as to hard believe someone would be the member of a forum for almost 3 years and only have 2 posts, but it happens, LOL.
 
#265 · (Edited)
If the claims ATP are making are true then carbs would have sold themselves to big OEM manufacturer orders. A carb that claims it is better than fuel injection??! What a joke..if that is the case then this technology needs to be given Honda, Yamaha, Ford, Chevy, ect. so they can convert future motorcycle and car models back to an ol fashioned carburetor.
 
#266 ·
You're reading too much into it. APT states that "The extremely fine fuel atomization provided by the SmartCarb exceeds that of Electronic Fuel Injection". This is not a claim that the SmartCarb outperforms fuel injection under any and all circumstances by any means so it really isn't fair for you to put that sort of unreachable goal on them. Also, the SmartCarb seems to be aimed mostly, if not exclusively, at the 2-stroke market. What use would Ford or Chevy possibly have with this technology? Don't get me wrong, I think APT has a lot of work ahead of them and some big claims to fulfill, but let's not misunderstand a claim and make it any harder on them than it already is.
 
#267 ·
if they were being sold today,i wouldn't think twice about getting one.if it does half of wha they say,it would be worth it.race season is only 1 1/2 months away.with the weather the way is is here"ohio"it's going to be hard to get my new motor brokin-in and tuned.last year I spent atleast 1/2 hour a week making sure the jetting was spot on.each track was different.temp and altitude was always a factor.i'm really hoping they start selling them off of the shelf so I can get one in a week.
 
#268 ·
^^^^^dont hold your breath... I was told around christmas, then a few weeks after I will get a tracking number for shipment, well its been more than a few weeks after christmas and havent gotten anything yet from APT.
 
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#269 ·
The Phantom said:
It surprises me that the cast version took so long to come out and the billet versions have been out for some time.. How hard can it be if, and thats a big if, the billet version was a proven winner, is it to duplicate in a cast version?? Maybe they are correcting some of the problems that some have found with the billet version and incorporating their findings and fixes into the newer cast version..It sure would be nice to have some communication from APT on this.. If they can send emails out putting us off for months.. Then an explanation into our investment(for which we havent seen no return yet)should not be a lot to expect. Im glad to see there are some good reviews of it. Im waiting for a bit.. If I can not get it to run the way its suppose to then I will just send it back..I will not accept a once you run it you bought it type policy on this. If thats their position on it, then they can keep it IMO.
Click to expand...
They have a money back guarantee. If you don't like, they give you your money back. That's a pretty fair deal. I think you can rest easy with that.

In order to get these carbs to work right , they have to have tight tolerances. The cast versions had to have draft added to them for casting purposes and etc. It has been a trying process for them to get all the machining down to extremely accurate. Plus, they have had a problem with their supplier. The contracted a company that agreed to do all the casting and then do the machining. After the project got started, the casting company realized they couldn't comply, so they had to shop out another company to do the work. This is partly why it has taken so long. Even after that, there were some things that the casting company didn't do correctly and more parts had to be made. This is some of the information I have gotten from talking to Corey at APT.

Oriolman said:
If the claims ATP are making are true then carbs would have sold themselves to big OEM manufacturer orders. A carb that claims it is better than fuel injection??! What a joke..if that is the case then this technology needs to be given Honda, Yamaha, Ford, Chevy, ect. so they can convert future motorcycle and car models back to an ol fashioned carburetor.
Click to expand...
They have spoken to some of the OEM's, but not many of them are selling two strokes. They are in talks and testing with KTM and Gas Gas right now to work on getting them on as factory OEM carbs.

Scawn said:
You're reading too much into it. APT states that "The extremely fine fuel atomization provided by the SmartCarb exceeds that of Electronic Fuel Injection". This is not a claim that the SmartCarb outperforms fuel injection under any and all circumstances by any means so it really isn't fair for you to put that sort of unreachable goal on them. Also, the SmartCarb seems to be aimed mostly, if not exclusively, at the 2-stroke market. What use would Ford or Chevy possibly have with this technology? Don't get me wrong, I think APT has a lot of work ahead of them and some big claims to fulfill, but let's not misunderstand a claim and make it any harder on them than it already is.
Click to expand...
You are correct sir. The big push right now is for the 2 stroke bikes, because you can tell a huge difference in them right away. They are also working on their 4 stroke carb that will be out later this year. So that will be coming as well.
 
#270 ·
#271 ·
Oriolman said:
So far on other forums the reviews have been quite less than stellar. I really feel with having only one tuning circuit on this carb (the metering rod) it is never going to carburate very clean. It needs a pilot jet in the worst way.

http://www.dirtbikeworld.net/forum/showthread.php?t=96980&page=28]The HP, YZStuff Review of the APT Smart Carb on a yz250- Dyno info - Page 7 - Yamaha 2-Stroke - ThumperTalk[/URL]

APT smart carb? Anyone? - Page 26 - dbw - dirtbikeworld.net Members Forums
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If you look over on the ktmtalk and gasgas forums, you will find the reviews are quite different. The guys that have tried them are very happy with them.
 
Discussion starter · #273 ·
I understand there are skeptics. But I set my 36mm billet on full rich and I have amazing top end pull and the atomization doesnt seem to hurt my bottom end no oil drips or thick smoking. Running this carb hard months now with great results
 
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#274 ·
That's awesome to hear brewer! Hopefully they get the cast versions out for everyone and prove these are what they say they are. The billet ones seem to be working well in certain applications and I don't expect the cast to be any different. We did cancel our pre-ordered SmartCarb for our QuadZilla, but only because of our build plans kept changing while we waited. Originally we were just putting that carb on and doing nothing else. We've gone back and forth between a full OEM restoration or a complete "you have no chance of holding onto these handlebars" motor build. The SmartCarb doesn't fit either of those builds because it's not OEM and it wouldn't provide enough fuel to a wildly bored and ported 500cc motor.
 
#275 ·
I am SO glad to finally be shipping orders out! It has been a long wait , but I am excited that they are working so well. The video that was posted on Thumpertalk by YZ Stuff was #1 a very early order, which we learned quickly a richer metering rod was needed after modifying with the insert. #2 the open throttle cable tube was not helping the lean condition, letting air come in through there. #3 who revs a customers bike up like that, when way lean until it stalls- over and over? The stock throttle cable on the YZ250... some customers say it fits just fine- others can't seem to make it work?? I ordered a replacement from Motion Pro, should be here on Tuesday. Should have perfect throttle cabels available for every model by the end of the month. Quite the education figuring out cables on everything from Suzuki to Husky...lol.
Quadzilla, was sad to see you go... thanks for sending the great picture. I agree with you that the SC is not OEM, not yet at least.... However, I think that you are underestimating it. I might agree that Quadzilla would like a 40mm a bit more, but SC is no joke.... its all "you have no chance of holding onto your teeth" power. Your right it will not dump a lot of fuel into your engine just so it can come out of your tailpipe, but the engine does pull what it needs and then bbbbrrrrrraaaaappppp! (That's as technical as I get, ha ha)
We will be offering several early model 40mm billets over the next couple of weeks. I'm working on getting dual throttle cables that will fit before I promote them, as they will work best on Banshee's and Snowmobiles. If anyone is interested PM me, they will be sold at a discounted price- just the basic early version. They are runners- and perfect for you quad guys... Thanks to all of you! I also have 36mm Billets in and ready to ship tomorrow. Go Sea-Hawks!
 
#276 ·
That is great news Liz! There has been tons of anticipation surrounding the SmartCarb. Even though it doesn't fit our quadzilla build, that doesn't mean I won't come back and grab one for my 89 TRX250R I'm currently building. I may be getting back with you in the next month or so once I get my motor figured out. Thanks so much for stopping by and giving everyone an update.
 
#278 ·
two stroke smoke said:
I am SO glad to finally be shipping orders out! It has been a long wait , but I am excited that they are working so well. The video that was posted on Thumpertalk by YZ Stuff was #1 a very early order, which we learned quickly a richer metering rod was needed after modifying with the insert. #2 the open throttle cable tube was not helping the lean condition, letting air come in through there. #3 who revs a customers bike up like that, when way lean until it stalls- over and over? The stock throttle cable on the YZ250... some customers say it fits just fine- others can't seem to make it work?? I ordered a replacement from Motion Pro, should be here on Tuesday. Should have perfect throttle cabels available for every model by the end of the month. Quite the education figuring out cables on everything from Suzuki to Husky...lol.
Quadzilla, was sad to see you go... thanks for sending the great picture. I agree with you that the SC is not OEM, not yet at least.... However, I think that you are underestimating it. I might agree that Quadzilla would like a 40mm a bit more, but SC is no joke.... its all "you have no chance of holding onto your teeth" power. Your right it will not dump a lot of fuel into your engine just so it can come out of your tailpipe, but the engine does pull what it needs and then bbbbrrrrrraaaaappppp! (That's as technical as I get, ha ha)
We will be offering several early model 40mm billets over the next couple of weeks. I'm working on getting dual throttle cables that will fit before I promote them, as they will work best on Banshee's and Snowmobiles. If anyone is interested PM me, they will be sold at a discounted price- just the basic early version. They are runners- and perfect for you quad guys... Thanks to all of you! I also have 36mm Billets in and ready to ship tomorrow. Go Sea-Hawks!
Click to expand...
Thanks for the update Liz! Glad to see you take the time to come on here and give an update. It was good talking to you last week and I can't wait til mine ships this week! There will definitely be a large show and tell report from me once I get mine in and get it mounted. I was excited to find out that I would get it in time for my first race this year on Feb. 23. Be looking for the race video coming soon!
 
#280 ·
two stroke smoke said:
I am SO glad to finally be shipping orders out! It has been a long wait , but I am excited that they are working so well. The video that was posted on Thumpertalk by YZ Stuff was #1 a very early order, which we learned quickly a richer metering rod was needed after modifying with the insert. #2 the open throttle cable tube was not helping the lean condition, letting air come in through there. #3 who revs a customers bike up like that, when way lean until it stalls- over and over? The stock throttle cable on the YZ250... some customers say it fits just fine- others can't seem to make it work?? I ordered a replacement from Motion Pro, should be here on Tuesday. Should have perfect throttle cabels available for every model by the end of the month. Quite the education figuring out cables on everything from Suzuki to Husky...lol.
Quadzilla, was sad to see you go... thanks for sending the great picture. I agree with you that the SC is not OEM, not yet at least.... However, I think that you are underestimating it. I might agree that Quadzilla would like a 40mm a bit more, but SC is no joke.... its all "you have no chance of holding onto your teeth" power. Your right it will not dump a lot of fuel into your engine just so it can come out of your tailpipe, but the engine does pull what it needs and then bbbbrrrrrraaaaappppp! (That's as technical as I get, ha ha)
We will be offering several early model 40mm billets over the next couple of weeks. I'm working on getting dual throttle cables that will fit before I promote them, as they will work best on Banshee's and Snowmobiles. If anyone is interested PM me, they will be sold at a discounted price- just the basic early version. They are runners- and perfect for you quad guys... Thanks to all of you! I also have 36mm Billets in and ready to ship tomorrow. Go Sea-Hawks!
Click to expand...
Very cool. It's great to see a company that puts the time and effort into R&D before the product hits the shelves. People are willing to wait for a great product.
 
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