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post #1 of 2 (permalink) Old Aug 1st, 2013, 9:58 am Thread Starter
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Weird Engine Braking

Hello All! First time posting here, sorry if it's noobish!

I tried searching and either there isn't anything on this subject or I don't know the proper terms.

Lately I've been riding my '99 K1200RS (around 35k miles) to work and around 70MPH (or at least when it's most noticeable) it feels like it's slightly engine braking every 4-5 seconds and then goes back to what I had the throttle at. It feels like I let off the throttle slightly for about a second or two and then go back to where I have the throttle set. It doesn't do this all the time, but it feels like its a lot lately. The morning drive in today it was pretty much nonstop for the whole time I was on the interstate doing 70. The RPM's drop slightly and the MPH drops around 1-2 each time. It's very strange. I tried to feel it going 40-50MPH, but either it doesn't do it then or it's not as strong.

Any ideas on why this might be happening?

Thanks!!

Josh
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post #2 of 2 (permalink) Old Aug 2nd, 2013, 1:40 pm
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One obvious area to look at are your throttle cables. Check for required slack and make sure they are free to move and not sticking. You have about the right amount of slack when the rpm does not increase if you idle and turn the steering lock to lock. As stock the throttle springs are very hard on the wrist. A previous owner may have slackened off the throttle springs so much there is now less tension to overcome the cable resistance.

If you think the effect you describe is like you backed off the throttle a fraction, then a big guess that you should get the TPS (Throttle position sensor) checked. A BMW dealer can do this with their diagnostics. Does this happen at a particular speed and rpm with a particular throttle setting? If you changed down say to 5th then went up to the same speed with a higher rpm and different throttle setting, do you get the same problem? If you don't then I might suspect the throttle pot has a bad section of track at the point were you were doing 70 in 6th. Conversely, if you stayed in a lower shift and hit that same point in the throttle range I would expect the same problem (but at a lower speed, if it is a TPS problem). Put some temporary marks around the throttle grip with a wax crayon, then whilst riding look down and see where the grip is at your problem speed. Now try the throttle in the same position in a lower gear before the bike maxes out on rpm.

The effect of a momentary loss of ignition may also have the same feeling. There are 2 coils, each one feeding a pair of cylinders. Most would know if it was a momentary loss of ignition because it feels different. Coils tend to show failures best with high rpm. This time try riding the same and higher rpm in lower shifts and see if you get the problem.



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Last edited by voxmagna; Aug 2nd, 2013 at 1:45 pm.
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