I agree with what you say, I fitted an after market bellow to my barista pro to reduce retention and can usually get very close to the full 18g out.

Yeah a faster shot is going to be less extracted. In general, it's harder to over-extract a light roast bean, so if you are using light roast beans you may find that you like the taste from longer extraction times. For medium and darker roasts, you often get a strong bitter/burnt taste from over-extracted espresso. A good rule of thumb is that under-extracted coffee tastes sour while over-extracted coffee tastes bitter.

@@Joseph-kz1vn Thanks. That is just the information I was looking for!

yeah each bean will need to be dialed in separately. Typically that will take maybe 1-2 mediocre shots before getting it right. That said, Ive found with experience I’ve gotten better at making decent guesses for where to start depending on the roast of the beans.

Will be dependent on bean and grind setting. The bean I am currently using at setting 10 on grinder gives 10 grams of ground coffee after 7.5 seconds of grinding. I then go into Menu singe shot Custom with empty shot glass on scale zeroed press and hold single shot button for 6 to 7 seconds for pre-infusion and then them keep eye on scale and stop the shot at 20 -22 grams (or whatever output you find tastes best, usually somewhere in range 2 to 3 / 1 for espresso / coffee weight). Single shot is then set for that bean. The same can be done for double shot with double basket and button and then your only variable will be grind time between single and double shots. POf course if you choose to use another bean then you repeat the process. The use of a £10 digital scale makes the process a whole lot simpler.

The single and double settings are pretty different. You typically need to grind more beans in order to have the portafilter filled to the right height, but also grind a few clicks coarser to prevent too slow of a flow. Even if you literally halved the weight of the beans you still need to grind coarser because the shape of the basket creates more pressure due to fewer holes. It's hard to tell you exactly what weight you'll need because some beans are more dense than others. I can fit 20 grams of my medium roast beans into my double basket, only 15 for my decaf dark roast.

I did not program it for time. It’s volumetric. So if you’re getting much less than 30 seconds or so, you either have channeling issues or you need to grind finer.

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Sometimes the portafilter is tight if the machine is cold. If you pull a blank shot of water through first, is it still tight?

@@Joseph-kz1vn I works thanks, now I am concern about temperature... it is 65 celsius for the shot, vs Barista expres 73 celsius

You can adjust the temperature a bit in the settings. My personal experience is that the default setting is best for the light roast beans I’m using. It get significantly more bitter if I raise the temperature. If you’re worried about the temperature in the cup, preheating the cup and preheating the portafilter can help, of course.

@@Joseph-kz1vn I already programmed the maximum temperature. and it is still much lower than in the BE (almost 10 Celsius of difference). I really would have loved to keep the BP since the coffee extraction is wonderful because of the cream it generates. greetings from Mexico

@@Joseph-kz1vn As Joseph said, try the default setting however it's important to run two flushes through the portafilter to get it hot then towel dry and dose. Cheers.

Usually bitter means over-extracted. How are your shot times? And is your pour coming out pretty evenly? Early on, I distribution issues, but was able to get the shot time targets by grinding way too fine. The result was pretty bad espresso.

@@Joseph-kz1vn so what you’re saying is I could be grinding too fine?

@@tylermprice possibly. If your distribution is not good. It can be hard to see distribution problems without a bottomless portafilter. I might buy some Starbucks blonde and try myself - I’m curious.

@@Joseph-kz1vn yes please let me know if you do and I’d love to hear your thoughts and know what your burr grinder settings are. I think that mine could be so fine that it’s making so bitter.

Default.

Default from the factory can be 5, 6, 7. Mine was 6 and I moved it to 4. What is yours set at?

@@philipjchapman Mine is a 6. Didn't know it could come with different factory defaults. So far I haven't had a bean that has forced me to change it.

Before, after, and during.