How is Reverse supposed to work ? - BMW Luxury Touring Community
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post #1 of 23 Old Jun 13th, 2016, 3:46 pm Thread Starter
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How is Reverse supposed to work ?

On my K1200LT - To reverse,
Engage neutral, Twist knob, Press starter.

The engine revs and the bike rolls back about 18 inches then the reverse disengages.
Hold down starter button and repeat for another 18 inches or so back.

Is it cutting out early ? Should the bike roll back until the button is released ?
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post #2 of 23 Old Jun 13th, 2016, 3:48 pm
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Re: How is Reverse supposed to work ?

Something is not working right.. I put mine in reverse and as long as i hold the starter button down, it continues to reverse.


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2002 R1150RT (Sold)
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post #3 of 23 Old Jun 13th, 2016, 3:52 pm
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Re: How is Reverse supposed to work ?

Quote:
Originally Posted by Bimbler View Post
On my K1200LT - To reverse,
Engage neutral, Twist knob, Press starter.

The engine revs and the bike rolls back about 18 inches then the reverse disengages.
Hold down starter button and repeat for another 18 inches or so back.

Is it cutting out early ? Should the bike roll back until the button is released ?
Mine stays engaged as long as I'm hitting the button.
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post #4 of 23 Old Jun 13th, 2016, 4:15 pm
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Re: How is Reverse supposed to work ?

I believe this is caused by a faulty or miss-adjusted speed sensor. Let me check on that and find a thread.

EDIT: Yes, the threads I find indicate the speed sensor on the transmission or possibly a bad reverse controller.

You can try and clean the speed sensor or replace it if that doesn't help and after that, I would look at a reverse conteroler from flebay

Gordon
Sugar Hill, GA
2001 K1200LTI – Champagne (current ride) Lazy Susan
1998 R1100RT – Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced


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Last edited by bmwcoolk1200; Jun 13th, 2016 at 4:29 pm.
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post #5 of 23 Old Jun 13th, 2016, 4:28 pm
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Re: How is Reverse supposed to work ?

Quote:
Originally Posted by Bimbler View Post
On my K1200LT - To reverse,
Engage neutral, Twist knob, Press starter.

The engine revs and the bike rolls back about 18 inches then the reverse disengages.
Hold down starter button and repeat for another 18 inches or so back.

Is it cutting out early ? Should the bike roll back until the button is released ?
Are you on a flat surface they dont like ramps ect
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post #6 of 23 Old Jun 13th, 2016, 4:43 pm
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Re: How is Reverse supposed to work ?

Mine has always worked as you described, just a bit longer. Engages for about 1-1.5 meters the cuts off. Possibly to avoid overheating the starter motor. Not 18" though.


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post #7 of 23 Old Jun 13th, 2016, 4:44 pm
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Re: How is Reverse supposed to work ?

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Originally Posted by mondrage View Post
Mine has always worked as you described, just a bit longer. Engages for about 1-1.5 meters the cuts off. Possibly to avoid overheating the starter motor. Not 18" though.


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It should run until you release the button. If it doesn't, there is a problem.

Gordon
Sugar Hill, GA
2001 K1200LTI – Champagne (current ride) Lazy Susan
1998 R1100RT – Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced


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post #8 of 23 Old Jun 13th, 2016, 4:45 pm
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Re: How is Reverse supposed to work ?

Oh!


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post #9 of 23 Old Jun 13th, 2016, 4:51 pm
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Re: How is Reverse supposed to work ?

Mine goes into reverse, light comes on but it does not move when I push the starter button. Is this the reverse motor that is bad or could it be gunked up?
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post #10 of 23 Old Jun 13th, 2016, 4:53 pm
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Re: How is Reverse supposed to work ?

Quote:
Originally Posted by peterj View Post
Are you on a flat surface they dont like ramps ect
Ramps (within reason) shouldn't be an issue. A flat surface almost defeats the purpose of having reverse. I use mine to back into my garage and my driveway has a decent downslope and never had a problem. I could see a great enough slope being more than the starter torque can overcome but that's about it.
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post #11 of 23 Old Jun 13th, 2016, 4:55 pm
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Re: How is Reverse supposed to work ?

Quote:
Originally Posted by ProfSnape View Post
Mine goes into reverse, light comes on but it does not move when I push the starter button. Is this the reverse motor that is bad or could it be gunked up?
The reverse motor is actually the starter motor so you have a different issue as long as the bike starts normally.

Gordon
Sugar Hill, GA
2001 K1200LTI – Champagne (current ride) Lazy Susan
1998 R1100RT – Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced


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post #12 of 23 Old Jun 13th, 2016, 4:59 pm
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Re: How is Reverse supposed to work ?

I don't mean to be argumentative, but having read up on the reverse system, it has nothing to do with the starter. There is actually a revers gear in the transmission, therefore ramps should not have anything to do with it. As an experiment and if your balance is good, try and give it a little gas and you'll see that it actually speeds up.


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Palm Coast, FL.

2006 K1200LT (Love it)
2002 R1150RT (Sold)
2007 Harley FLHTCU (sold at 137k Miles)
1999 Harley Night train (blew the eng at 150k miles)
1986 harley Davidson FLTC (Sold When assigned to Europe
1982 Harley Wide Glide (sold)
1981 Kawasaki k1000LTD (sold)
1980 Triumph Bonneville (sold)
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post #13 of 23 Old Jun 13th, 2016, 5:12 pm
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Re: How is Reverse supposed to work ?

HMMMM. I may have to "reverse" myself.. I'm reading conflicting discussions on the K1200lt reverse system. Some say it's an actual function of the transmission, and others say it's the Starter. Now i'm really confused, as My Dealer in Jacksonville specifically told me the reverse had nothing to do with the Starter. I look at transmissions for sale in various outlets, and they all say K1200lt transmission with reverse.. If anyone has a definitive guide to this, i'd sure like to read it. As a side note, i've had absolutely no issues reversing even with a steep incline.


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Joe
Palm Coast, FL.

2006 K1200LT (Love it)
2002 R1150RT (Sold)
2007 Harley FLHTCU (sold at 137k Miles)
1999 Harley Night train (blew the eng at 150k miles)
1986 harley Davidson FLTC (Sold When assigned to Europe
1982 Harley Wide Glide (sold)
1981 Kawasaki k1000LTD (sold)
1980 Triumph Bonneville (sold)
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post #14 of 23 Old Jun 13th, 2016, 5:58 pm Thread Starter
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Re: How is Reverse supposed to work ?

Thanks for the comments.

Obviously there is a problem with a faulty part somewhere.

However I still have reverse - I just have to do it in a series of inelegant steps while others glide serenely backwards.
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post #15 of 23 Old Jun 13th, 2016, 6:22 pm
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Re: How is Reverse supposed to work ?

Quote:
Originally Posted by BeemerJoe View Post
HMMMM. I may have to "reverse" myself.. I'm reading conflicting discussions on the K1200lt reverse system. Some say it's an actual function of the transmission, and others say it's the Starter. Now i'm really confused, as My Dealer in Jacksonville specifically told me the reverse had nothing to do with the Starter. I look at transmissions for sale in various outlets, and they all say K1200lt transmission with reverse.. If anyone has a definitive guide to this, i'd sure like to read it. As a side note, i've had absolutely no issues reversing even with a steep incline.
This is near as I can get with an explanation.
when you shift into rev there is a dog gear in the top of the g/box that that slides across connecting the starter drive with the gear, the reverse controller limits the rpm so that the bike doesn't go flat out backwards and yes it is driven by the starter motor. As said if you hold the button down it should keep going until you release.
Mine did this after a bmw service many years ago they left a wire unplugged to the rev controller

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post #16 of 23 Old Jun 13th, 2016, 6:37 pm
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Re: How is Reverse supposed to work ?

When I push the starter button for reverse mode the RPM steps up a bit. I always assumed it was because of the significant amount of reduction gear from the starter to the gearbox, and to keep the battery happy. I have never tested it, but it feels like is has plenty of torque to make it up a ramp. this is making me want to try something crazy with it (here hold my beer and watch this).
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post #17 of 23 Old Jun 13th, 2016, 7:22 pm
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Re: How is Reverse supposed to work ?

My 2007 K1200LT did that under warranty...the reverse controller was replaced, which fixed the problem.

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post #18 of 23 Old Jun 13th, 2016, 8:09 pm
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Re: How is Reverse supposed to work ?

Most likely cause is a bad speed sensor. It tells the reverser controller how fast you are moving and if it gets no signal it stops until you press the starter button again. I would change it $ first before I went after the $$$ controller.

John
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post #19 of 23 Old Jun 14th, 2016, 9:08 am
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Re: How is Reverse supposed to work ?

I found this on a copy of the owners manual:
"Do not operate the reverser for more than 1 minute – bear the state of battery charge in mind. The reverser switches off if it is overloaded."

I also believe I read somewhere that reverse is limited to 1mph, if it exceeds that I believe it will switch off as well. That would lead me to believe the speed sensor is at fault. It is possible the cables to the starter/battery could have a bad contact or something is overloading it but my money is on the sensor.
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post #20 of 23 Old Jun 14th, 2016, 10:30 am
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Re: How is Reverse supposed to work ?

Quote:
Originally Posted by Bimbler View Post
Thanks for the comments.

Obviously there is a problem with a faulty part somewhere.

However I still have reverse - I just have to do it in a series of inelegant steps while others glide serenely backwards.
As many have already stated. This is a "classic" fault. It is fault in speed sensor on top/side of gearbox or the connector to it (like I had).
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post #21 of 23 Old Jun 21st, 2016, 3:41 pm
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Re: How is Reverse supposed to work ?

Most likely the reverse speed sensor on the right side of the bike into the transmission... I had the same problem. Installed a new sensor and it works fine...
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post #22 of 23 Old Jun 23rd, 2016, 8:14 am
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Re: How is Reverse supposed to work ?

Quote:
Originally Posted by jtalka View Post
Most likely the reverse speed sensor on the right side of the bike into the transmission... I had the same problem. Installed a new sensor and it works fine...
What he said.

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post #23 of 23 Old Jun 23rd, 2016, 8:48 am
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Re: How is Reverse supposed to work ?

One final thought: it can not go up a steep ramp or curb etc.

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