Reverse gear - explanation please - BMW Luxury Touring Community
 
LinkBack Thread Tools Display Modes
post #1 of 7 Old Aug 6th, 2011, 6:33 am Thread Starter
Senior Member
 
K100Dennis's Avatar
 
Join Date: Jul 2008
Location: Railton, Tasmania, Australia
Posts: 876
Reverse gear - explanation please

I noted recently while bringing my '05 K12 home from sunny Queensland that the reverse drive wouldn't propell the bike over a 2" high step on some concrete (at a motel). The electric drive continues to operate but the bike remains stationary. The reverse system works perfectly up the incline in my driveway, in fact I find it to be excellent. I am mechanically inclined and have checked the exploded view in the Clymers but it doesn't appear to show any kind of overload clutch. Does anyone know how this feature works ?
K100Dennis is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old Aug 6th, 2011, 7:12 am
Senior Member
 
Daveh's Avatar
 
Join Date: Mar 2005
Location: Reisterstown, MD, USA
Posts: 271
Re: Reverse gear - explanation please

Reverse drive is your starter motor an does not have enough torque to over come a step. Keep trying an you will burn up your starter motor.

Dave

2003 K1200LTC Titan Silver
BMWBMW, BMWMOA, AMA, IBA


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Daveh is offline  
post #3 of 7 Old Aug 6th, 2011, 8:56 am
Wrencher Extraordinaire
 
jzeiler's Avatar
 
Join Date: May 2004
Location: Hazel Green, AL, USA
Posts: 13,131
Re: Reverse gear - explanation please

There is no overload clutch. The reverser controller senses transmission gear speed and sends an appropriate voltage (less that the full 12V) to the starter motor to operate reverse. There is nothing but gears between the motor and the outputshaft of the transmission (I just had one apart for replacement of the input shaft bearing). It is hard to hear the motor running when the engine is running and up idled to reverse.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
jzeiler is offline  
 
post #4 of 7 Old Aug 6th, 2011, 9:58 am
Senior Member
 
vernvernvern's Avatar
 
Join Date: May 2006
Location: King City, Missouri, USA
Posts: 812
Talking Re: Reverse gear - explanation please

If I know I'm backing up over something, I just help it with my feet.

An example is when I back the bike out of a front wheel chock. Since I'm a little short legged, I have to put my feet on blocks of wood. LOL


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
====
Bought used K1200LT number 3. This one is green/teal with 31,369(now 7/29/2018 54,143) miles and is an '02. The first 2 bikes made it to near 150,000 miles.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Due to heart health, the Dr says not to ride under 40 degree air temp. Ugh! Now it is harder to get my 18000 miles a year in just in the summer. Guess that stopped my 20 degree rides now.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


78 years young!
04 Honda Reflex.....Hers (it mostly sits)
Converted HD rider.
Love this LT bike and still waiting for my first speeding ticket. LOL
Vern
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

=====
vernvernvern is offline  
post #5 of 7 Old Aug 6th, 2011, 10:25 am
Wrencher Extraordinaire
 
jzeiler's Avatar
 
Join Date: May 2004
Location: Hazel Green, AL, USA
Posts: 13,131
Re: Reverse gear - explanation please

Quote:
Originally Posted by Daveh
Reverse drive is your starter motor an does not have enough torque to over come a step. Keep trying an you will burn up your starter motor.
Actually when you look at the gear reduction train it should pull it straight verticle!!! First is only 3.864 to 1 while reverse is a whopping 115.7 to 1.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
jzeiler is offline  
post #6 of 7 Old Aug 7th, 2011, 6:45 am Thread Starter
Senior Member
 
K100Dennis's Avatar
 
Join Date: Jul 2008
Location: Railton, Tasmania, Australia
Posts: 876
Re: Reverse gear - explanation please

Yes, I was aware of the reduction ratio, and the starter is 700 watts (almost 1 hp), so I too wasn't thinking a small step would cause it to stall. Need to think some more about this.
K100Dennis is offline  
post #7 of 7 Old Aug 7th, 2011, 8:12 am
Senior Member
 
wa1200lt's Avatar
 
Join Date: Apr 2009
Location: Vancouver, WA, USA
Posts: 2,745
Re: Reverse gear - explanation please

I installed a break over type wheel chock on my lift. I have to help it "over the hump" in order to get the front wheel out of the chock. Push the starter button and give a good pull back on the tiller handles and out it comes. Without the pull there is no way it will back out of the chock.

Loren

WAK1200LT
Loren

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Cave quid dicis, quando, et cui
wa1200lt is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the BMW Luxury Touring Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
How does reverse gear system work? Allred K1200LT 20 Jun 28th, 2018 6:40 pm
Start button and reverse gear operation problem pkbrial K1200LT 8 Aug 27th, 2010 6:06 am
Reverse gear surging birdman K1200LT 36 Sep 13th, 2007 1:38 pm
Reverse gear will not disengage!!! aussielt K1200LT 18 May 2nd, 2007 2:38 pm
Reverse gear again! birdman K1200LT 1 Nov 2nd, 2006 7:38 am

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome