Author Topic: APT Smart Carb Testing today 40mm Billet Sphynx 363 (Read 33552 times)

Burns363R · « **on:** October 05, 2014, 07:12:47 PM »

Was a little lean on top, after 1/2 mile WOT, it was pinging a little bit and wasnt pulling on top quite as hard as it should. But it does run good, very crisp. Float bowl level is everything on these, i need to add a little more to the float level and i think i will have it.

Watch the video and enjoy.

http://youtu.be/RY2d1TopJmw?list=UURhJ3oFnLARwWYVG9fDuWKQ

Pumashine · « **Reply #1 on:** October 05, 2014, 07:55:25 PM »

Which FMR did you end up using?

Burns363R · « **Reply #2 on:** October 05, 2014, 07:58:29 PM »

I have the 74. Still lean though. Corey says that they will break in and get richer.

Pumashine · « **Reply #3 on:** October 05, 2014, 08:01:23 PM »

Quote from: Burns363R;43948

Still lean though.

Did you richen up the clicker?

Burns363R · « **Reply #4 on:** October 05, 2014, 08:03:14 PM »

Well the clicker is only ment to do idle to half throttle. You can adjust it and it will help top end but the bike will end up not wanting to idle and be rich down low.

hontrx265r · « **Reply #5 on:** October 05, 2014, 09:58:58 PM »

I havent heard one in person, but all the videos people post using these carbs the bikes sound funny to me.

Burns363R · « **Reply #6 on:** October 06, 2014, 08:10:02 AM »

It does have a different sound to it. But mostly what your hearing is the GO Pro, I need to do a video with the other back on it that allows for better sound.

Tbone07 · « **Reply #7 on:** October 06, 2014, 08:41:28 AM »

Is the bottom-end improvement really that noticeable with the SC?

Burns363R · « **Reply #8 on:** October 06, 2014, 08:45:23 AM »

Id say so, im not 100% satisified with it. If i lean up the bottom a little more it will be amazing down low, and it idles without loading up. Very cool.

Pumashine · « **Reply #9 on:** October 06, 2014, 09:51:33 AM »

Quote from: hontrx265r;43960

I havent heard one in person, but all the videos people post using these carbs the bikes sound funny to me.

Kyles video definitely does sound much lower pitch than in person. At first I just thought it was his pipe. But through the entire video it sounds nothing like Ryan Blacks smart carb video. Mine sounds more like Ryans as the pitch is high sounding (lean). If you set the carb lean down low it wants to rev out much quicker than if you set it to rich. I would say from my experience with the SC all kiehens are set to rich down low. I have now got my Smart carb set way rich and I can lug her down with no problem which is the way the Kiehen preformed. I fear running to lean but in time I believe we will get a FMR (fuel metering rod) made the correct size for WOT. So for now I am 13-15 clicks rich. I will do more plug checks as the outside temperature cools down. Don't want to run WOT if its 100 degree's out and she's runnin lean.

hontrx265r · « **Reply #10 on:** October 06, 2014, 10:24:46 AM »

They all just sound zingy... which might be great but when your are so conditioned to the keihen the change is weird. They might be a little better but I dont think they are there yet. Everyone seems to be struggling with some area.

rablack21 · « **Reply #11 on:** October 06, 2014, 11:02:17 AM »

It seems to be that if you have a 350cc or below, they are dialed in good. It seems that they are still dialing in the needle for the sizes above that. My 38 cast runs good with my 310cc. It is plumb angry with acceleration. The throttle response is pretty ridiculous. Sounds like you're getting there Kyle. I think alot of people need to keep this is mind and you made a little mention of it with the float bowl level: these are NOT plug and play carbs. They need to be setup and adjusted accordingly just like any other carb. But once they are set, they are good to go. If you buy this carb thinking all you got to do is strap it on and it's perfect for every application already set from the factory, you are kidding yourself. APT doesn't make that boast, yet people seem to think that.

Pumashine · « **Reply #12 on:** October 06, 2014, 05:26:39 PM »

Quote from: rablack21;43996

It is plumb angry with acceleration. The throttle response is pretty ridiculous.

Yep, and he is not kidding. Its like feeding your R a bunch of steroids. You will be surprised how much power is being hidden by your Kiehen carb. You will be asking yourself if someone added 50cc's to your bike.

RyanWsly · « **Reply #13 on:** October 06, 2014, 06:00:20 PM »

Quote from: Pumashine;43991

Kyles video definitely does sound much lower pitch than in person. At first I just thought it was his pipe. But through the entire video it sounds nothing like Ryan Blacks smart carb video. Mine sounds more like Ryans as the pitch is high sounding (lean). If you set the carb lean down low it wants to rev out much quicker than if you set it to rich. I would say from my experience with the SC all kiehens are set to rich down low. I have now got my Smart carb set way rich and I can lug her down with no problem which is the way the Kiehen preformed. I fear running to lean but in time I believe we will get a FMR (fuel metering rod) made the correct size for WOT. So for now I am 13-15 clicks rich. I will do more plug checks as the outside temperature cools down. Don't want to run WOT if its 100 degree's out and she's runnin lean.

It's funny you say that because my pilot and needle have always been leaner than what most people say they run or whoever the builder is recommends. I can literally count on my hands the number of pilot jet sizes that match mine that I have seen on the forums over the years. Mine is in the low 40's right now and I still feel it is rich, my needle diameter is about the only difference I see in my needle which also affects what most would call the bottom end.

RyanWsly · « **Reply #14 on:** October 06, 2014, 06:01:45 PM »

Quote from: Burns363R;43988

Id say so, im not 100% satisified with it. If i lean up the bottom a little more it will be amazing down low, and it idles without loading up. Very cool.

Interested to see how you compare the power delivery from the different carburetors you have run and this setup once you get finished adjusting on it.