KX Riders
Maintenance & Technical => KX500 Original => Topic started by: jamex on February 16, 2015, 07:41:07 AM
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A carb that requires no jetting & when you have the mixture rod dialled in correctly, you don't ever have to worry about altitude variations or ambient changes!?!
Has anyone heard of these or had anything to do with them, sounds fantastic, too fantastic, but a very interesting website:
http://www.powerapt.com/smartcarb.php
Used on UAVs, this has really got my attention, but the price, I want more info, I hope that someone has some experience with them....
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just my .02$ from what ive seen...good idea thats hit or miss. known of a couple people put them on and end up going back to a keihin due to not being able to dial it in correctly.
others put it on and have no issues and work great in elevation change. they are $$$, especially the billet version. i think they may have rushed the product a bit to market.
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They are an evolution on the lectron carb from what I have read but they seem to be very hit and miss. Their release has been delayed numerous times due to problems and a lot of people gave trying to set them up and went back to their old carb out of frustration. I must admit I would be curious to try one.
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Alward25 has been threatening to get one for months..../
I wish he would do it... :-o
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On the cafe husky site there have been some good discussions about the smart carb and the lectron. I think APT pissed a lot of people off by not releasing the carbs when they promised. I know locally a Lectron will set me back $550 plus fine tuning.
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Blaster, I've mailed them requesting a 38mm billet carb, just waiting for their reply as I asked a few questions. The one testimonial was about a K5 & the one sponsored rider was in South Africa, he won his class in the 2012(quite a while back) enduro series on a Husky WR250.
The theory of operation makes sense but I think that they had some development problems, anyway I'm willing to give it a try.
I also just had my bike on a friends dyno just before I returned to work & it made 63hp at 4393ft 25degrees C, so it will be a good yard stick to performance differences.
If it works well then I may put the K5 carb on my girlfriends Banshee with a 2 into 1 intake manifold setup, that will eliminate a lot of balancing issues & make it easier to jet.
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Dyno numbers would be great along with a personal review on installation and set up :-D
Looking forward to it.
But I suspect if your carb is jetted correctly that you won't see a lot of gain.
Since I am constantly wrong, we'll see :lol:
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I was more fascinated by their two cycle engine. "0 Oil Consumption". Interesting.
http://www.powerapt.com/sonicflow-engine.php
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Yeah, that is cool.
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"Zero oil consumption" and "Three times the power of a four cycle engine" are pretty lofty statements. Still stuck on the "Zero" though. 'Low' or 'Less' as claimed by some of the other new two strokes I understand but 'zero' is definite. Not to hijack the carb thread...
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well, I've done testing on Billet and Cast 38mm models
https://www.youtube.com/watch?v=4e55g6Y4ppQ&list=UUZ1tEbTw9S1fHzFGxejj1lg
https://www.youtube.com/watch?v=r3DiUz3fZQE&list=UUZ1tEbTw9S1fHzFGxejj1lg
https://www.youtube.com/watch?v=ozc7QhQgl4E
https://www.youtube.com/watch?v=qijiGuEmOok
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So Roost, your verdict over stock????????
well, I've done testing on Billet and Cast 38mm models
https://www.youtube.com/watch?v=4e55g6Y4ppQ&list=UUZ1tEbTw9S1fHzFGxejj1lg
https://www.youtube.com/watch?v=r3DiUz3fZQE&list=UUZ1tEbTw9S1fHzFGxejj1lg
https://www.youtube.com/watch?v=ozc7QhQgl4E
https://www.youtube.com/watch?v=qijiGuEmOok
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So Roost, your verdict over stock????????
Just a guess.... Pulse :-D
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Mine started perfect, when richened with different rods from how they arrived.
Same setup with a buddy 1000' higher was a disaster. Another guy near him has the same deal. 50+ kicks to get it lit and then it idles like crap.
When it gets running right, like how I had them tuned, the pipe shook like a cat crapping razor blades!
The billet had some "upgrades" that it shouldnt have left the shop with, like the tip valve ball material/coating, float valve changes etc.
The cast, meh, wasn't too weird but i knew it needed a richer rod against their recommendation that it was proper as shipped. so it got here and i started it but couldnt use it really until a rod showed up 5 weeks after I got it ordered.
The carbs, no matter the clicker range or richness still get into a 3/4 throttle position lean detonation on deceleration. single circuit metering for ya.
The carbs weren't finished well, like it took messing with to get the cable in the slide and little things that could really tick a guy off at that kinda pricing. The cast was a dirty casting looking piece.
The billet had a really nice slide where the cast was machined with trailing marks which to a guy who makes chips for a living is kinda a tick off to see. These carbs are supposedly very closer tolerance etc, so why isnt the throttle valve lapped in, chromed, or just made right.
The SC guys i know have all gone back to standard PWK or pulse and all the sudden the bikes start, they run at any rpm and they don't fill the crankcase while sitting.
I think a pwk airstriker is much crisper low end, runs cleaner, and is substantially cheaper. The airstriker is a 38mm, flows the same as a 39/39.5/41 for cfm under 1/2 throttle, flows with less turbulence, more accurate metering and flows the same wfo, so its not really choking anything off, you can get to the jets without an allen wrench too.
Stick with stock, airstriker, or go Pulse.
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Wow. Lot's a lot of info and not exactly a glowing report! 50+ kicks! Yikes!
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Hmmm this might throw a wrench in my plan of using them for a Turbo k5 ... they did sound a little to good to be true :x . They did promise me dyno time if I get the k5 Turbo working so long as I use an apt smart Carb
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I'm not ever going to say that Corey Dyess isn't a 2-strike lover that'll go out of his way to help you. But the rest of the crew there kinda doesn't have the same enthusiasm.
You'll need a cultivator spring for the slide! Haha. The stock ones are so lite that a good cr5 intake signal will draw that slide open on its own. You can see it by looking in the airboot at idle while shining a timing light strobe in there.
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"The stock ones are so lite that a good cr5 intake signal will draw that slide open on its own."
That is,,, really, really, not good. Really. Seriously. Not. Good.
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Rootius Maximus.......curious to the jetting you have found works for cr500 with a 38mm pwk airstryker.....I have a 58 pilot with a 165 main jet with a DGL needle in the third clip on my 87 K KX500 Seems crips but I am not a carb tuner pro compared to you . I am running at around 700-1500ft above sea level at at around 5-15 degrees Celsius. I've cracked the throttle open a few times and it seems very close but I do not want to burn the top end up because I'm not understanding what the engine is looking for......on a side note the work you have done for me sounds so clean and crisp compared to other bike of the era..... amazing attention to detail.......passed on your name to many on the west coast here......hope I can put some extra $$ in your pocket. Most common thing I am asked about after refering you is if you are able to to re=coat cylinder.....not sure if that is up your alley
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I know I'm way late to the game here, but I have run the 38 a.s. on my old '85 cr5 and my kx5 with no issue, most guys are looking for more power.
I wanted more low mid as I was riding from 3000 to 6000' and 13 or 14/51 (10mph or so 1st gear) single track skidder and fire roads with guys way faster than me. Up here you rarely have the oppty. to get to 5th let alone wfo. I never had any issue with short wfo 4th/5th as there was less than a mile or two to get it. If you are looking for low/mid throttle response the improved velocity of the 38 worked for me. There are some of my old posts here, but I think my cr5riders may be long gone... RoostMax has done some great work search his stuff on both sites.
you can't go wrong...Tuck\o/
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There is a letter response in Dirt Rider written by Editor Adam Booth this month regarding the APT carb. He said something similar (to roostmax) regarding 3/4+ throttle lean operation. Letter stated he blew up his personal KTM 300 using this carb with major damage to the top end sustained.
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Mike Grant, Haven't run a KX here yet, won't be on a standard PWK when I do either, going pulse induction.
The K5 generally takes more pilot than a CR, the numbers you're at is about what I'm hearing.
I'd only have Millennium plate cylinders, I don't do that work.