Robbot Tech Kayfun V4 Clone Review
The Kayfun rebuildable atomizer series made by SvoeMesto is not only the most popular, and most imitated bottom coil style atomizer that this market has seen within the last year and half, it is also the most influential. From the Squapes, to the Orchids, Erls and Lemos, even as these rebuildable atomizers have qualities and design elements that make them unique unto themselves, they all find their foundation in the Kayfun style. The genius of creativity is not found in originality, as much as it is in the brilliance of reinvention.
With the coming of the new SvoeMesto Kayfun V4, we see a complete reinvention of the Kayfun style atomizer bearing very few design and engineering elements of the original Kayfun style. The Kayfun V4 brings with it a new body style which includes a glass tank option, a new build deck, redesigned juice feed/juice control, an adjustable 510 pin and a lot more parts and pieces â arghhh.
What I find most interesting as well as very suspicious is the fact that the clones of the new Kayfun V4 atomizer were well into production by the time the first authentic SvoeMesto Kayfun V4 was made available for worldwide sale. How was that even possible? There were many who in error thought that the Kayfun V4 was too complex to be cloned, let alone that it would happen the same week that the authentic Kayfun V4 was released. If we have learned anything, it should be to never underestimate China because their hustle is real folks.
The Kayfun V4 clone featured in this review is made by Robbot Technology, and was provided for the purpose of this product review. The Robbot Tech Kayfun V4 was intended to be a 1:1 replication, and is packaged in a cloned SvoeMesto gift box which includes the Kayfun V4 clone atomizer, a glass tank, a polycarbonate tank section, full user manual, and a parts and assembly demonstration sheet.
Where to Buy a Kayfun V4 Clone
- Buy here for $18.23+ – Free shipping from China
ROBBOT TECH KAYFUN V4 SPECIFICATIONS:
- Brand: Robbot Technology
- Type: Rebuildable bottom coil atomizer
- Material: 304 grade stainless steel
- Connection threading: 510
- E-liquid capacity: 3.5-4.5 ml
- Diameter: 22mm (base) 23mm (body with SS and Glass tanks)
- Height: 77.7mm
- Weight: 104 grams
- Liquid control
- Top filling capacity
- Airflow control
- Quad pole deck design
- Adjustable 510 connector
- Removal of deck without draining the tank
Being that Robbot Technology had previously cloned the ZNA 30 using 316L stainless steel, I think that many, including myself had expected the same for their Kayfun V4 clone. However, that is not the case. This 1:1 Kayfun V4 is made from 304 grade stainless steel, which is not an inferior grade of steel as much as it an easier to machine and mass produce grade of stainless steel.
Upon initial inspection out of the box I was happy with the way this clone looked, and the weighty feel of it. At 104 grams it is about 8-14 grams heavier than the prior Kayfun 3.1 ES and Lite versions. The Kayfun V4 also has a totally different aesthetic from the prior Kayfun versions. The top cap design is the only aspect that remains reminiscent of the original Kayfun style. There is now a laser engraved SvoeMesto logo on the middle tank section at the center of an engraved diamond shape. There is also a new 3D engraved SM logo on the front of the outer belt of the threaded chimney bell.
Based on photos, as well as statements from the owners of the authentic Kayfun V4, the engravings on the Robbot Tech clone are not as deep as the authentic, but are nicely done none the less.
During the early days of the pre-release of the Kayfun V4 there was lots of awe regarding the seemingly daunting 41 part assembly of this reinvented Kayfun, which also applies to its clone. However, the most basic parts breakdown into 10 pieces, which is still a lot more pieces than we usually see on a RBA/RTA. The 10 basic parts that make up this atomizer clone are all well machined. The threads were all smooth, and all parts threaded together easily, although the bolt that holds the middle and upper tank segment together was installed very tightly. I actually needed pliers to remove it initially.
It is not necessary to break this atomizer down into it 41 parts in order to clean or use it. But if you do, then I suggest that you have the parts and assembly guide on hand while you do so. This atomizer did smell of machine oil when I received it however, it wasn’t anything that a 10 minute cleaning couldn’t fix.
Now looking at these parts you can see how much of a departure there is from the prior Kayfun style design, for which I will cover all of the essentials in this review.
The only aspect of the new deck design that remains similar to the prior versions are the positive and negative blocks. At first look the decks construction appears to be solid although the positive looks lightly chewed around the edges, so I was not impressed with that. The four catch screw design may lead some to believe that is atomizer was intended for dual coil configurations however, that is not the case. The purpose of the fours screws is to add more options for installing and positioning your single coil.
On the upper deck there are two counter sunk e-liquid holes on either side of the center block where your wicks will sit. The air flow hole at the center of the deck appears to be a little larger than some of the other V4 clones on the market.
Now the air flow hole at the center of the deck is fed through the four air holes around the part of the device that SvoeMesto refers to as the UC connector. However, the degree of air flow into the atomizer is controlled by an air flow screw which can only be accessed by removing the adjustable 510 connection as shown below.
The 510 pin is installed with an insulator surrounding it to prevent shorts. Once removed, you can access the air flow control screw which you will need a flat head screwdriver in order to adjust. If making the adjustment from the position shown in the photo below, you would turn the screw clockwise to close, and counter clockwise to open. Now here is one place that some of the new design elements can be seen as an annoyance. That is a good bit of work to do in order to adjust air flow to your liking.
While reviewers such as Phil Busardo felt it was not a big deal to just set the air flow once to taste and forget about it, this is not necessarily the reality of how some of us vape. And considering Phil’s favorable comments regarding the tool-less adjusting of the new Russian 2.0 atomizer, I was surprised that he didn’t take some issue with this “tool and work required” airflow control system of the Kayfun V4.
Some of us like to tailor air flow according to our builds and e-liquids which can change, and in which case this style of air flow control can be a PITA. So how you get on with this air flow adjustment system will depend on whether you are a “set it and forget it” vaper, or the “adjust airflow to suite different builds with different e-liquids” vaper.
The stainless steel spring under the deck is thick and stiff, and it has not caused any issues with the resistance of my atomizer changing, as I have heard reported by some owners of the authentic Kayfun V4. As I get to the juice control mechanism of this atomizer clone, this is where I find my one and only real issue with the build quality on the Kayfun V4 clone that I received.
Out of the box my juice control was very difficult to move. Once I was able to muscle the deck up and out of the “UC upper section”, the o-ring #16 was a little frayed as though it was smashed by too much friction. So initially I thought the o-ring was too big, and I changed it out for a thinner o-ring from another atomizer.
That seemed to help a little, but not enough to make adjusting the JC easy. My guess is that the size and tolerances on this particular part of my atomizer are off. I have spoken to, and read the comments of a few other owners of the Robbot Tech Kayfun V4, and this is not an across the board occurrence, yet is has been reported on a couple of them. Youtube reviewer Richard Ng also reviewed this particular clone, and his juice control works smoothly.
In the photos below you can see what the deck looks like when the juice control is in the off position (top right), and in the open position (bottom right).
REBUILDING / PERFORMANCE
Even as there are now 4 catch screws instead of 2 on the build deck, the act of building a coil on the Kayfun V4 remains the same. I used 27 gauge Kanthal to make a 9/10 wrap on a 2mm screwdriver, which metered out to 1.5 ohms. As per SvoeMesto, the Kayfun V4 was not intended for sub ohm builds, and it is recommended that you do not build below .8 ohms if you are using the standard kit/insulator. SvoeMesto, does offer a 4s sub ohm upgrade kit for after market sale. I am also aware that Tobeco is now producing a 4s sub ohm as well.
Installing a build on this deck is not more difficult, or easier with the new wider positive/negative block and 4 catch screw configuration. Wicking is also the same, I used the same amount of cotton wick as I have with previous Kayfun versions. You should also continue to prime your wicks with e-liquid prior to filling your tank.
The first time that I went to reassemble the Kayfun V4, it took three tries before I got it right. First I forgot to install the chimney bell, and installed the bottom tank section first, lol. Then I put the entire tank together, including the bolt that holds the tank sections together, when I realized that I forgot to install the deck sleeve â Oy vey.
I do not like how much work is involved in changing from the stainless steel tank, to the glass tank, most especially due to the bolt/nut which has a lot of threads. A quick change between tanks is out of the question here. With glass kits being a popular after market accessory for the prior versions of the Kayfun, I would have liked to have seen a more simple, yet effective glass tank design with the new Kayfun V4.
To be the best of knowledge the juice control system of the new Kayfun V4 has two settings, off and on. Being able to turn the juice flow into the tank off, also allows the user to be able to top fill the Kayfun without the risk of forcing e-liquid into the deck chamber when the drip tip adapter is installed to the top cap after filling.
If you look closely at the threading on the drip tip adapter in the photo below, you will notice the flat section of the threads which will allow air to escape from the tank when the adapter is installed after filling. This is to prevent air from being pushed into the tank which would cause flooding.
Being that the juice flow control on the Kayfun V4 clone that I received is very stiff, top filling this device has been anything but a pleasure for me. Even as I feel SvoeMesto’s Kayfun V4 design is overly complicated, having incorrect build tolerances around my juice flow control is the fault of Robbot Tech. The fault of this one aspect of the device really did bring down my ability to enjoy this atomizer.
Between the new juice control, air flow control, and the difference between how each tank assembly affects juice feed into the deck, I had to do a lot of adjusting, and fiddling in order to get this atomizer to a place where I could enjoy its performance. While I have not experienced any leaking, I did experience some gurgling specifically when I had the air flow set a tighter setting with Max VG juice. It sounded like breathing through a nose filled with mucous.
When set up in the SS or Glass tank configurations with max VG liquid, and a very open air flow, I did experience dry hits while chain vaping. This is an issue that I have never had with any Kayfun atomizer. The flavor production was also muted in comparison to atomizers like the Rose or Aqua v2. However, when I finally switched to the polycarbonate M-tank configuration, with the same e-liquid and open air flow, the overall quality of the vape greatly improved for me. It went from a muted and disappointing vape, to very flavorful and satisfying vape. I also have had no problems with chain vaping while using the M-tank.
I believe that the fitment, and tolerances of the lower SS tank section (inner space between the tank section and chimney bell) does have an effect on how the e-liquid feeds into the chamber and deck of the Kayfun V4. Due to the stiff juice control of my Kayfun V4 clone, I now prefer to leave the juice control at its open position, and simply refill the tank from the bottom with a syringe.
When Robbot Technology told me that they were doing a 1:1 replication of the new Kayfun V4, I was over the moon excited about it. Being that Robbot Technology had done so well with replicating the Zen ZNA body, I felt confident that they could nail the machining of this clone. So I am a little disappointed that I did not receive their best Kayfun V4 clone for this review. While 90% of this Kayfun V4 clone is very well machined, the very stiff tolerances of the juice control on my clone is clearly a defect. And unfortunately, the juice control is also an integral aspect of the new Kayfun V4 design.
To be fair to the Robbot Tech Kayfun V4 clone, I do know that this issue with the stiff juice control is not an across the board issue. I have heard very positive feedback for the Robbot Tech KF4 from other consumers, including some that have both the Robbot Tech clone as well as the authentic SvoeMesto Kayfun V4. But I can only review and judge the device that I actually received, and I was a little disappointed with it.
With regard to the new Kayfun V4 design itself, I have said since the first day that I built and used this atomizer that I felt it was an overly engineered design, and that it created too much work for the user. Can a great vape be had with the Kayfun V4? Yes, but you’re going to have to work for it. This is not a total slam of SvoeMesto’s new design because I understand the nature of creativity, and it is a constant process of recreating, and fine tuning to achieve an optimal result. I am willing to bet that SvoeMesto is already taking user feedback into consideration, and figuring how to best fine tune, and improve this newest design.
There are several different manufacturers producing Kayfun V4 clones, including Eycotech, Limwell, Shenzhen Easter, Tobeco, SXK, and Ivogo. I have already received the Tobeco made Kayfun V4 clone, which is presently getting very good marks on the ecig forums, and so I look forward to seeing if my lukewarm feelings about the Kayfun V4 clone will change at all.
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