Gene Café CBR-101 roasting and general roasting advice needed

Discuss roast levels and profiles for espresso, equipment for roasting coffee.
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Joined: 6 months ago

#1: Post by es1337o »


I've been browsing topics on this forum for a while, but I've had trouble finding threads answering my specific questions.

I've roasted coffee for since fall 2020. My "training" consisted of my colleague teaching me how to roast. He read about roasting 10+ years ago. Since then my experience came from trial and error and further debates with my colleague.
Nowadays my standard roasting procedure is something like this:
Preheat to 200C (392F)
Dry at 160C (320F) for 6 minutes
245C (472F) until first crack (usually 6-7 minutes)
225C (437F) for 1½-2 minutes
Cool with Gene Café Cooler

I use this recipe (with minor variations) for pretty much all beans unless the result tastes horrible. Am I on the right path? Am I doing something fundamentally wrong that is easy to change?
I have had trouble with uneven roasts with some beans. I read that it might be due to a moisture difference between beans. I also read that beans are properly dry when they turn yellow. Therefore, I experimented with drying the beans at 160C (320F) until they turn yellow. Drying phase is then 15 minutes instead, but the roast turns out more even. Is a long dry bad for the coffee?

Another question:
The beans in the attached picture (Sidamo, washed, 1900-2200 MASL) are sometimes wrinkly with dark spots. Roasting procedure is the same as above. Is this how they're supposed to look?

Any feedback is welcome. Thank you very much in advance.

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Joined: 7 months ago

#2: Post by Gm7dha »

I don't know know my exact timings with mine but my method is:

1. Don't preheat
2. Set to max temp until 30-40 seconds into 1st crack
3. Drop set temp by 8-10 degrees
4. Continue to roast for around 2 mins or until I eyeball the colour.
5. Cool in Gene until around 80-90 degrees
6. Decant into large baking tray and leave by a window.

So far results have been very consistent aiming for a medium roast.

I've been doing it for 5-6 years but I haven't been experimenting much as my results are generally similar and to my taste using all sorts of green beans.

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Joined: 4 months ago

#3: Post by dwitting »

How do you identify the 1st crack ? You use any tools ?

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#4: Post by cai42 »


Your ears are the only tools you need.


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Joined: 14 years ago

#5: Post by boren »

Your ears and a BBQ mat:

Gene Cafe - Hearing Cracks