Commercial characteristics
- Sponsor who loaned the product for the magazine: Acquired on our own funds
- Price of the tested product: 149.90 Euros
- Product category according to its selling price: Luxury (over 100 euros)
- Atomizer type: Classic rebuildable
- Number of resistances allowed: 2
- Resistor Type: Classic Reconstructible, Rebuildable Micro Coil
- Type of wicks supported: Silica, Cotton, Ekowool
- Quantity in milliliters announced by the manufacturer: 4
Reviewer comments on business characteristics
Here is the latest version of the most famous atomizer! Entirely built in surgical grade stainless steel, with nearly 28 patents and with a number of parts never seen before, the Kayfun 4 is at the top of the market price may bring a good set of modifications:
The most of Kayfun 4 compared to previous versions:
- E-liquid flow control
- Top filling (by simply unscrewing the drip tip and its base)
- Air flow control
- Kit dedicated to subhom with PEEK insulation (optional)
- Interchangeable connector to adapt harmoniously with the main Mods on the market (optional)
- Access to assembly without emptying the tank at any time
- Supplied with 3 tanks (Pyrex, PMMA and Stainless Steel)
Physical characteristics and felt quality
- Width or Diameter of the product in mms: 22
- Length or height of the product in mms as it is sold, but without its drip tip if it is present, and regardless of the length of the connection: 57
- Weight in grams of the product as sold, with its drip tip if it is present: 100
- Material composing the product: Stainless steel, Stanless Steel lde surgical grade
- Form Factor Type: Kayfun / Russian
- Number of component parts without screws and washers: 42
- Number of threads: 7
- Quality of the threads: Excellent
- Number of O-rings, Dript-Tip excluded: 6
- Quality of O-rings present: Good
- O-ring positions: Top Cap - Tank, Bottom Cap - Tank, Other
- Capacity in milliliters actually usable: 4
- Overall, do you appreciate the quality of manufacture of this product with regard to its price? Yes
Rating of the vapelier as to feelings quality: 5 / 5 
Reviewer's comments on physical characteristics and perceived quality
While the price may seem high, but the quality is there. Whether it is the machining or the finishing of each part, the manufacturer obviously wanted to establish its excellent reputation in the field.
The engineering deployed for the design of this atomizer is simply impressive. The number of parts but beyond that, the utility of each part and the design are worthy of the most precise of mechanical parts.
Everything has been carefully thought out, from the most important part to the last screw.
Functional features
- Connection type: 510
- Adjustable positive stud? Yes, through an adjustment by thread, the assembly will be flush in all cases
- Presence of air flow regulation? Yes, and variable
- Diameter in mms maximum of the air regulation possible: 0.1
- Minimum diameter in mms of the air regulation possible: 3
- Positioning of the air regulation: From below and benefiting the resistances
- Spray chamber type: Chimney type
- Heat dissipation of the product: Excellent
Reviewer's comments on functional features
This atomizer with multiple superlatives does not suffer from criticism if it is used as it should. Admittedly, the first assembly will undoubtedly not be the good one and it will be necessary to search a little before finding “its” vape and “its” rendering on the Kayfun 4. It is the antithesis of the atomizer “plug and play. ”. It is earned and discovered through trial and error that everyone will make at the start. But, after having lived this period of break-in, a truly exceptional rendering is at the end of the tunnel. A simple atomizer? Not at all! Rather a thoroughbred to be mastered from start to finish.
Like all precision mechanics, care should be taken to use them as the manufacturer intended. Thus, the “normal” version will not tolerate the sub-ohm and the atomizer will make you feel it, if only by the rapid degradation of the seal of the positive stud. But by adding the optional “special sub-ohm” kit, you will be able to add this function to your atomizer while taking advantage of all its intrinsic qualities.
All the points of friction such as the e-liquid control are mounted on Teflon rings to ensure perfect operation. A first on an atomizer !! And an additional guarantee of longevity and ease of use.
Drip-Tip Features
- Drip tip type: 510 Only
- Presence of a Drip-Tip? Yes, the vaper can immediately use the product
- Length and type of drip-tip present: Medium
- Quality of the drip-tip present: Very good
Reviewer's comments on the Drip-Tip
Superb column type drip tip with a base a little wider than the top and a beautiful engraving reminiscent of the stainless steel tank and which will complete the design of the latter.
Evaluation of the packaging
- Presence of a box accompanying the product: Yes
- Would you say that the packaging is up to the price of the product? Yes
- Presence of a user manual? Yes
- Is the manual understandable for a non-English speaker? Yes
- Does the manual explain ALL features? Yes
Vapelier's note on packaging: 5 / 5
Reviewer's comments on conditioning
Conditioning of the most complete, we are entitled to three tank (ss, pyrex and pmma) and a box that presents and protects the contents very well. Too bad, however, that the PEEK insulators remain optional because these insulators are better at keeping the high temperatures than those provided. But again, as with a software like Photoshop, you are free to add the extensions that are necessary for your type of vape.
Appreciations in use
- Transport facilities with the mod of the test configuration: Ok for a side pocket of Jean (no discomfort)
- Disassembly and cleaning facilities: Easy but requires a workspace
- Filling facilities: Super simple, even blind in the dark!
- Easy to change resistors: Easy but requires a workspace
- Is it possible to use this product throughout the day with several vials of EJuice? Yes perfectly
- Was there leak after one day of use? No
- In the event of leaks during tests, descriptions of the situations in which they occur
Vapelier's note on ease of use: 4.2 / 5 
Reviewer's comments on the use of the product
Once understood and well taken in hand, the Kayfun 4 is a very easy to use atomizer. If we can not abstain from the learning period, we find that afterwards, things become infinitely more fluid.
Certainly, it can be scary at first glance but it is not. Once you understand the filling principle, using it is child's play.
Recommendations for use
- With which type of mod is it advisable to use this product? Electronics AND Mechanics
- With which mod model is it advisable to use this product? No rule, it's like you like
- With which type of EJuice is it advisable to use this product? All liquids without problem
- Description of the test configuration used: Box dna40, resistance to 0.8ohm and 25w
- Description of the ideal configuration with this product: There is no ideal configuration with this atomizer. It will work as well in meca mod as in electro.
was the product liked by the reviewer: Yes
Overall average of the Vapelier for this product: 4.7 / 5 
Link to a video review or blog maintained by the reviewer author of the review
The mood ticket of the reviewer
But what went through the mind of its creator to have the idea of such an atomizer?
It has what every vaper has dreamed of one day:
- Control of e-liquid arrival according to its VG rate
- Adjustable airflow allowing a vape as tight as air
- Quick access to your assembly for a quick change of cotton
- Quick filling from the top of the atomizer.
You will have understood it, it is the ato of all the superlatives and yet it has in my opinion a small flaw:
Regarding the vape nothing to say, it's good, it's saturated with aromas, it lives up to the reputation of the manufacturer. But, in view of the multiple improvements made, I admit that I expected better, much better even. Because the rendering is largely as good as that of its predecessor but not necessarily better. We can therefore ask ourselves the question of such a debauchery of engineering to achieve an almost equivalent taste result. Perhaps its price positioning, which took 30 € compared to version 3.1ES, gave hope for a big leap forward in terms of rendering?
But, in the end, even if we can argue about its quality / price ratio, I like it, me. The assembly becomes child's play once the animal has been tamed, the management of cotton is very simple, it will be very hard to drown your assembly or to take a dry-hit when you have learned to handle the arrivals of air and juice.
At that moment, you can almost speak of a beginner atomizer because you will find it so simple in everyday use and even if all the technology it displays can be scary, do not worry, it is not 🙂. However, it will be able to strongly scald the real beginners in the rebuildable which will turn to an easier atomizer to begin their adventure in the matter.
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