Booster Plug or Rapid Bike Easy? - KTM Duke 390 Forum
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post #1 of 14 Old 10-08-2019, 03:10 PM Thread Starter
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Booster Plug or Rapid Bike Easy?

I want to cure the low down jerkiness of my standard Duke 390. I am looking at two options based on functionality and price: Either the Booster Plug (cheapest option) or the Rapid Bike Easy (has a bit more adjustability). Has anyone here more real time on the road info of any of the two devices mentioned? Regards!
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post #2 of 14 Old 10-08-2019, 04:19 PM
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Well l can tell you from experience that RBE cures the low speed running issues, as l have it on my Duke 390.
Just got back from a ride in fact.

I believe the booster plug works as well, they both work by fooling the bike ECU into making a slightly richer fuel mixture

Personally l prefer the way the RBE does it, which is by interrupting the signal from the exhaust lambda sensor and modifying it.

Maybe someone who has a BP fitted can relate their experience with it on their bike.
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post #3 of 14 Old 10-08-2019, 05:38 PM
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Mine (2016) has a Booster Plug and it definitely improves things and gets rid of most of the surging at low speeds. Before I fitted it meeting slow traffic was a chore. If I was always in the city maybe I would be more critical.
No noticeable difference in fuel economy and it's been on the bike for 3000+ miles without any issues at all.
My decision was made easier by finding a used BP at half the new price so I'm very happy with the improvement vs. cost
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post #4 of 14 Old 10-08-2019, 06:09 PM
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RBE on mine, can't speak of any other devices but before I had the Rapid Bike Easy the Duke was terrible in car parks, manoeuvring or just wanting to turn slowly with full balance and control. Whenever in first or second gear I'd have the clutch half pulled in to stop the engine jerking on and off power.
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post #5 of 14 Old 10-09-2019, 04:06 AM
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Booster plug did wonders for my bike (2017)
cheap and really ease to install and remove, 5 min tops each time (I removed it each time the bike was in for service due to possible warranty issues)
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post #6 of 14 Old 10-09-2019, 08:14 AM
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Booster Plug - 100%

It fixes your issues. There is no reason to mess with the closed loop (lamda).

https://www.boosterplug.com/shop/cms...tion_book.html

read that.


If you have a PRE 2017 Duke - I have a Booster Plug I can sell you.
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post #7 of 14 Old 10-09-2019, 10:25 AM
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No reason to mess with the Lambda.
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post #8 of 14 Old 10-09-2019, 12:42 PM Thread Starter
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Quote:
Originally Posted by pingywon View Post

If you have a PRE 2017 Duke - I have a Booster Plug I can sell you.

I take it then that the 2018 / 2019 390 will require another Booster Plug (upgraded??).
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post #9 of 14 Old 10-09-2019, 01:39 PM
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Quote:
Originally Posted by J W C View Post
I take it then that the 2018 / 2019 390 will require another Booster Plug (upgraded??).
2017 and BACK have a different connection then the 2018 and FORWARD (2019)

I have a 2018 Duke. I bought this booster plug off someone on the forum - a week after I got my bike and didn't realise it wont fit my bike. So I bough the correct one for my 2018 and now have the PRE 2017 for sale.
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post #10 of 14 Old 10-09-2019, 03:26 PM Thread Starter
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Quote:
Originally Posted by pingywon View Post
2017 and BACK have a different connection then the 2018 and FORWARD (2019)

Thanks for this info!!
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