APT SmartCarb

[siaknijustin]

First of all, I am not affiliated with APT, I just found this to be quite intriguing. I saw this carb mentioned on DirtBike Magazine's website in the news section and thought I might've seen Clay mention it here on the forum in the past. Does anyone know anything more about this? http://www.powerapt.com/smartcarb.php
btw, I find it very impressive how involved Clay is on this forum.

 

[Dave]

Let's say it improves fuel economy by 30% - just an optimistic guess as they don't list any hard numbers. So my 300 that gets around 23 mpg goes to 30 mpg. Riding 2000 miles per year (I don't ride nearly that much BTW) I'd save $80 a year at $4 per gallon. At $775 for the carb that's a lousy payback.
FWIW, my Honda 250 gets 30-35 mpg with its inferior EFI.

 

[GMP]

Its an interesting concept, quite possibly superior as they claim, but the price is just stupid. Not too many bought for tinkering with I'll bet.

 

[siaknijustin]

The greater efficiency is great but I am far more interested in their claim that it autocompensates for altitude changes. Where I live I can go on rides that will see 5000' of altitude changes. I do think that it is safe to assume that there's not much first hand experience w/ this product b/c of the price. You'd think that they'd enter the market with a lower price to see if their product would take off.

 

[gasgasman]

I bought one. I will post a review soon.
It is everything they say it is.

Bike sounds raspier and even the exhaust smells different due to the complete combustion of the fuel mixture.

 

[siaknijustin]

Awesome. Did you buy a straight bore or a taper bore? Let us know how well it auto adjusts as well as the increase in efficiency. I look forward to it.

 

[jostby]

I bought one. I will post a review soon.
It is everything they say it is.

Bike sounds raspier and even the exhaust smells different due to the complete combustion of the fuel mixture.

Is it a variable venturi like the Predator?

 

[gasgasman]

It is a straight bore.

No variable venturi.
It has a conventional slide with a straight needle.

You adjust the mixture by moving the needle up and down. That is done by the knob on top of the carb. You hold the throttle wide open ( engine off). Then push down on the knob to engage the needle and make the adjustment.

 

[siaknijustin]

You adjust the mixture by moving the needle up and down. That is done by the knob on top of the carb. You hold the throttle wide open ( engine off). Then push down on the knob to engage the needle and make the adjustment.

And that's it? Are there no further adjustments due to temp or elevation change?

 

[arminhammer]

I would love to try one but $800 for a carb! That's some carb!!!

 

[gasgasman]

And that's it? Are there no further adjustments due to temp or elevation change?

You just turn the knob according to your altitude. I can reach down and adjust the needle with my gloves on.
There are no external vent hoses on this carb-no dirt or water issues.

There is a die cast version coming out in the fall that will be way cheaper.

I have given the engineering dept at APT tons of "real world" feedback on this carb. A much better production version will be available on the billet version.

 

[nambo-trev]

i would really like to hear your feedback once you have a ride on it. performance differences?

 

[siaknijustin]

A much better production version will be available on the billet version.

Do you know how this version will differ from your current carb or the die cast carb?

 

[gasgasman]

i would really like to hear your feedback once you have a ride on it. performance differences?

I'll do a review once I have more time on the bike.
I have ridden twice with the carb.

The performance increase is noticeable. The drive out of the corners and out of whoops is amazing. There are no hiccups of any kind.
Fuel mileage did increase. Bike starts with one kick.

siaknijustin.
The die cast carb will be smaller and lighter. The billet carb is huge and heavy.
It is actually 3/4" longer than the Keihin.

 

[nambo-trev]

hmmm i really like trying new products that have potential, hopefully the die cast carb rolls out soon, i'd pick one up to give it a try just not at 800 bucks. im excited to read your full review!

 

[GMP]

I might go for it for a lot less $$ and a good fit. Something like a steering damper or Flexbars that you can take from bike to bike. Girard, how much trouble was fitting it being it is so long?

This is going to be devistating to Jakobi.

 

[Jakobi]

I'm all for it! It was the search for perfection that was my motivation. The only devistation this might cause is to the wallet if you all keep saying how well it works! Get one Glenn!

 

[GMP]

It will have to be A LOT cheaper, like less than half.

I would imagine the mixture is linear with respect to throttle opening, so no way to play to change power delivery like now with different tapers.

 

[Stoby]

carb

i googled it and all the info is vague I figured it was a gimmick esp. after seeing the bikes theyre selling.Until I saw a post from gasgasman, how did you find out about it? i'd like more details on how it functions can you point me to any articles ,tests etc. just curious, not buying anything for a while
Stoby

 

[GMP]

If there are patents pending I wouldn't be surprised with vague info. What is kind of goofy to me is their mission statement. Sounds like more of a green company than a performance part mfg. Looking at a broader spectrum of market possibilities I guess, but at $800 a pop you won't find these on Asian scooters running around the third world.