Author Topic: Cast Smart Carb has arrived! (Read 15992 times)

rablack21 · « **Reply #30 on:** February 24, 2014, 01:53:39 PM »

Finally got to ride the smart carb on an mx track this weekend. It performed very well. I was very happy with it. It provided plenty of power, it accelerated very well, I'm not sure what else you would ask for. It would allow my to stay a gear higher into the corners alot of times without having to use the clutch and would pull out of them cleanly. I was definitely not used to having to feather the crap out of the corners to keep the engine from bogging. With this carb, the engine didn't seem to care if I was at low rpms, it would pull out of it anyway. I will have to investigate this further.
My first official race of the season is in 2 weeks on a wide open track, and am going to practice on the track next weekend. I think I have going to switch my gears from 14/38 to 14/37 and drop 1-2 clicks on the mixture ratio to boost the bottom end responsiveness and see how I like that. On the other hand, when I go a tad richer, it seems to pull a bit harder the higher the rpm goes. It might be better of me to go a tad richer and pull that extra on the straight aways. I don't really remember how many sharp turns there are on this track. That extra bottom end only seems to help coming out of the tight turns where the rpms drop down some.
It also over revved very well. If I needed a little extra rpm for a short stretch it would give it to me without falling on it face.

Anyway, he is some more feedback for you guys. I have a video of yesterday's race. I will post it soon if it even turned out. It was really more of a practice because the track conditions were so terrible.

JasonB · « **Reply #31 on:** March 07, 2014, 01:52:47 PM »

thanks for sharing man! i cant wait to get mine. Looking for it any day now according to Liz at APT!

rablack21 · « **Reply #32 on:** March 07, 2014, 02:04:49 PM »

Got my next race on this carb coming up tomorrow. Hopefully, I should have some good videos to should how well it is working. That DOES NOT, by any means, mean I will win, lol, just that it is working like the best jetted carb I have ever used.

jcs003 · « **Reply #33 on:** March 07, 2014, 04:15:00 PM »

Quote from: rablack21;28133

Got my next race on this carb coming up tomorrow. Hopefully, I should have some good videos to should how well it is working. That DOES NOT, by any means, mean I will win, lol, just that it is working like the best jetted carb I have ever used.

im glad this worked out. too bad the billet carbs are so expensive. i dont understand why a block of aluminum/CNC time doubles the price.

john

JasonB · « **Reply #34 on:** March 11, 2014, 01:53:55 PM »

howd the race go Steve?

rablack21 · « **Reply #35 on:** March 11, 2014, 01:59:14 PM »

Quote from: JasonB;28592

howd the race go Steve?

I'm assuming you are talking to me. Check out this thread.
http://trx250r.org/showthread.php?2876-SE-Quads-Race-2014-Round-1-Bremen-MX-Park-C-Class

Ryan

ATV_Chick08 · « **Reply #36 on:** April 26, 2014, 06:54:19 PM »

Thanks for all the info you have posted on the smart carb. I was wondering if it still seems to be a great as initially reported. I have seen threads on the billet carb ,but this is the first I have read about the cast carb. I have a 38 mm air striker on my woods quads, and it's a PITA to try to get the jetting right with the weather around here. I'm definitely thinking of getting the 38 mm cast carb at some point when the hubby gets some extra overtime. The jetting on my Duncan MX motor doesn't seem to nearly as finicky (We never had to mess with the jetting like we do on the 38mm AS), but it has a regular 36 mm carb on it.

Sand_Blaster · « **Reply #37 on:** April 26, 2014, 10:25:02 PM »

Thanks for all the good info. I think you have sold me on this carb. I really hope ESR starts to sell these one day:)

rablack21 · « **Reply #38 on:** April 28, 2014, 09:00:40 AM »

Quote from: ATV_Chick08;32484

Thanks for all the info you have posted on the smart carb. I was wondering if it still seems to be a great as initially reported. I have seen threads on the billet carb ,but this is the first I have read about the cast carb. I have a 38 mm air striker on my woods quads, and it's a PITA to try to get the jetting right with the weather around here. I'm definitely thinking of getting the 38 mm cast carb at some point when the hubby gets some extra overtime. The jetting on my Duncan MX motor doesn't seem to nearly as finicky (We never had to mess with the jetting like we do on the 38mm AS), but it has a regular 36 mm carb on it.

Hey Breezy. Everything has still continued to run the same. The only issue I have had was a little bit ago. When I would be on the gas WFO pounding through the gears, it occasionally would bog. I had a suspicion to two what it was, but called up Corey at APT and asked him. He confirmed what I was thinking. He said that I was draining the fuel bowl and it wasn't filling fast enough. This was due to either needing more fuel level in the float bowl or the fuel cap was not letting enough air through the gas tank. He said that some of the aftermarket plastic check valve that you can buy for the gas tank are highly restrictive and don't allow much air in the tank. I happen to be running one of these. So, I replaced it will some regular black vent hose like factory and raised the fuel level in the carb. Not sure which one was the issue, but good to go now. Other than that, it has been running fantastic. I don't know what to do with myself not having to change jets and needle heights all the time trying to find what runs right! LOL. I have pretty much narrowed down the sweet spot on this low speed find adjustment knob on this Smart Carb and have not been messing with it much anymore. Hope this answers your question.

ATV_Chick08 · « **Reply #39 on:** April 28, 2014, 05:47:10 PM »

Quote from: rablack21;32571

Hey Breezy. Everything has still continued to run the same. The only issue I have had was a little bit ago. When I would be on the gas WFO pounding through the gears, it occasionally would bog. I had a suspicion to two what it was, but called up Corey at APT and asked him. He confirmed what I was thinking. He said that I was draining the fuel bowl and it wasn't filling fast enough. This was due to either needing more fuel level in the float bowl or the fuel cap was not letting enough air through the gas tank. He said that some of the aftermarket plastic check valve that you can buy for the gas tank are highly restrictive and don't allow much air in the tank. I happen to be running one of these. So, I replaced it will some regular black vent hose like factory and raised the fuel level in the carb. Not sure which one was the issue, but good to go now. Other than that, it has been running fantastic. I don't know what to do with myself not having to change jets and needle heights all the time trying to find what runs right! LOL. I have pretty much narrowed down the sweet spot on this low speed find adjustment knob on this Smart Carb and have not been messing with it much anymore. Hope this answers your question.

Thanks for the reply

. I had one of those plastic vent things on my 86 when I bought it. I had seen a thread somewhere about it possibly being too restrictive and just put a piece of vent hose on it. That's great to know that it works well under racing conditions.

Fire1 · « **Reply #40 on:** May 03, 2014, 06:15:28 PM »

Do you know how clicks out your factory setting was? I got mine on and just around the house it feels very good.

rablack21 · « **Reply #41 on:** May 03, 2014, 08:33:59 PM »

Corey told me the factory setting was 50-58 clicks from full rich. I am running 53 clicks so far.

JasonB · « **Reply #42 on:** May 11, 2014, 07:50:08 PM »

hey guys i pulled my SC off the 500 bike and installed it on the 310. I set it to 50 clicks from full rich. I had my brother start it since i can't kick any bikes over for another month. only ran it for 60 seconds but it sounded good. Im interested in giving this carb a chance on the 310 bike, i was really not happy with the results on the 500. It took my brother about 10 kicks to get the bike started, so i guess we will see how it runs after there is some time on the carb and i play with it more to get it dialed in better.

rablack21 · « **Reply #43 on:** May 12, 2014, 08:00:08 AM »

Quote from: JasonB;33686

hey guys i pulled my SC off the 500 bike and installed it on the 310. I set it to 50 clicks from full rich. I had my brother start it since i can't kick any bikes over for another month. only ran it for 60 seconds but it sounded good. Im interested in giving this carb a chance on the 310 bike, i was really not happy with the results on the 500. It took my brother about 10 kicks to get the bike started, so i guess we will see how it runs after there is some time on the carb and i play with it more to get it dialed in better.

Does it have the needle for the 310 in it or the 500? I remember you saying that they sent you the cr 500 needle, just checking you got the right needle in there. Hope you are healing quick!

JasonB · « **Reply #44 on:** May 12, 2014, 08:49:35 AM »

Thanks man! And ya I swapped back over to the 310 needle. I made sure the right one was in there lol. Can't wait to ride it and see how the bike responds with this carb