Cast Smart Carb has arrived!

[Pumashine]

Tuning the power band....sounds like a different thread, LOL. Doug was saying when he leaned it up (idol circuit) seemed to really wake it up! I am hoping to play with the billet 40mm smart carb this weekend. Keep us up to date. The guy on the other site had nothing positive to say.

[udontknowme]

In my experiences, slightly more fuel on the bottom end makes good torque and slightly less fuel on the topend makes best power.

Maybe Mr Hall can share his tuning experiences

seems like if your rich on the top it knocks your rpm down alittle also

[brewer_brewer]

I agree with the tuning the powerband comment

My billet 36mm is same way

Richen and top end pulls harder, lean and bottom end is insane snappy

Find the middle point and you get both.  Try less clicks.  

1 click makes a big difference

[mx250r91]

Great review so far!

I wonder if something like this would work better on the cable adjustment? http://www.mcmaster.com/#thumb-screw-nuts
I'm guessing the thread is about M6?

[rablack21]

Great review so far!

I wonder if something like this would work better on the cable adjustment? http://www.mcmaster.com/#thumb-screw-nuts
I'm guessing the thread is about M6?

Something like this would probably work as long as it fit down in that recessed area.

[rablack21]

I agree with the tuning the powerband comment

My billet 36mm is same way

Richen and top end pulls harder, lean and bottom end is insane snappy

Find the middle point and you get both.  Try less clicks.  

1 click makes a big difference

Yep, it's strange how it feels like that, but that is the best way I can describe it. I wouldn't normally go that many clicks at once for tuning purposes. For the time being, I just wanted to see what the extreme would feel like, a significant change. Right now, I am set to 2 clicks on the lean side from factory position. I haven't actually ran it in this spot yet. This was where I was gonna run it next. I am thinking about running it in the woods again tonight and playing with the clicker some more. The real question will be is what will work best for mx. That is the most important question for me.

I can definitely see how this could work great for alot of people. I could see the woods riders running it a bit on the lean side to be more responsive down low and I could see the dune guys running it on the richer side to ride it WOT.

[rablack21]

I took the R for another spin this evening in the woods by the house. I can definitely say that the engine is producing more power now. What I can't say for sure is if it has something to do with the clams that APT made about this carb giving a power gain or if it is from the fact that this carb's air/fuel mixture is more precisely tuned to the needs of the motor therefore, producing more power. It definitely runs like an uncaged beast when you hammer the throttle. What I can get over is how well the over rev works. I realize the over rev is not where your best power is, but how well it runs in this rpm range vs my old carb is quite noticeable and astounding to me.

[brewer_brewer]

Glad you are happy with it

I think this carb is just as good/if not better than cr ignition

[rablack21]

Glad you are happy with it

I think this carb is just as good/if not better than cr ignition

Agreed^^^. honestly, I think I would favor the carb over the ignition.

[JesseA420]

what sizes do they make the cast carbs in?

[rablack21]

what sizes do they make the cast carbs in?

The 38mm is available now, they are working on the 36mm and 40mm cast. They have some billet ones available now in 36mm and 40mm.

[JesseA420]

i may have to get a 40mm cast when they come out, the thought of perfect a/f ratio throughout the entire rpm range seems worth the cost of a new carb, but no thanks on the double price of the billet ones lol.

[rablack21]

i may have to get a 40mm cast when they come out, the thought of perfect a/f ratio throughout the entire rpm range seems worth the cost of a new carb, but no thanks on the double price of the billet ones lol.

I agree, and yes it is worth it!

[JesseA420]

i contacted the sales dept at apt, i got offered a 40mm billet for $150 off the listed msrp O.o i just may pull the trigger

[rablack21]

i contacted the sales dept at apt, i got offered a 40mm billet for $150 off the listed msrp O.o i just may pull the trigger

Sorry, I should have mentioned that. They have some first generation billet ones that are selling at a good discount. They work just fine, they are just moving towards a more modular design for the new ones.