BMW K bikes (Bricks)

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1Back to top Go down   Flat power band after 4K RPM Empty Flat power band after 4K RPM Fri Mar 29, 2024 2:17 pm


New member
New member
Hey there, I just picked up my new to me 91 K100RS and I was putting it around town and notice a loss of "power" or falls flat after 4000 RPM in every gear. it still accelerates but not at the same rate.

Im not really sure where to start. I did search the forum but didn't find much about it except it could either be a throttle sync or maybe a fuel filter clog? any help or direction would be much appreciated!


2Back to top Go down   Flat power band after 4K RPM Empty Re: Flat power band after 4K RPM Fri Mar 29, 2024 3:40 pm

Two Wheels Better

Two Wheels Better
Old, stale fuel? Clogged air or fuel filter? What are their history? The bike is new to you. Try a really good fuel system cleaner like Seafoam, and a few more miles to allow it to work.

Poor spark plug and/or ignition lead condition, misadjusted ignition timing or even a failing coil?
What have you attempted thus far? Can you check lead resistance? ~5K Ohms.

There are many things you should go over that might remedy the issue, or at least lead you to something after attempting to eliminate some basics. I would not go near the throttle body adjustment screws without a real understanding of their function and before I'd tried every step in troubleshooting a "loss of power" perception.

Patience is something you admire in the driver behind you and scorn in the one ahead.
~Mac McCleary
1977 R75/7-100, '93 K11/K12 Big Block, '95 R100 Mystic, '96 K1100RS, '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & 1st '98 K1200RS.
The Mystic, Big Block, 2nd K1200RS, K12R & K13 are running & ridable.

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