Just how heavy is a heavy throttle ? - BMW Luxury Touring Community
 
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post #1 of 11 Old May 12th, 2012, 2:04 pm Thread Starter
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Just how heavy is a heavy throttle ?

I have had my 2001 K1200LT since November last year and done a good few miles on it so far, however I have suffered from the well known heavy throttle problem and eventually stumped up a silly amount of cash for the 'upgrade' changing to the post 2005 setup.

Before I did the mod I thought, in all the threads on the subject I have read that it makes a big difference but just what is the difference ? Could I quantify it ?

So before fitting the mod I did some measurements. Not having a low number torque wrench I used an oil filter strap wrench around the twistgrip, a socket wrench, a wire coat hanger and some sockets, plus the wife's kitchen scales. See the attached picture.

I did the measurements first on my Norton Command as this has a light throttle and I thought it would give me something to compare against.

On the Commando the torque required to start the throttle moving is 88gM (That is 88 Gram metres).

On the BMW before the new cables this was a hefty 223gM

After the mod is came down to 109gM

So this means the new throttle requires less than half the torque of the old setup. and it is now not much more than the single carb Commando.

Calculation:-
Socket wrench weight = 541g
Socket wrench length from centre of twistgrip to end = 250mm
Weights (coat hanger + sockets) = 165g

Torque = (541/2 + 165) /4 = 109


Well I found it interesting ...

Will ride tomorrow and see what it feels like.

Tony
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2001 K1200LT Bought Nov 2011
1963 Norton Electra 400
1960 Norton Navigator Delux 350
1977 Norton Commando 850 MkIII, owned since new.
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post #2 of 11 Old May 12th, 2012, 2:15 pm
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Re: Just how heavy is a heavy throttle ?

Cool!


Patric Blackman
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post #3 of 11 Old May 12th, 2012, 2:44 pm
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Re: Just how heavy is a heavy throttle ?

My 2004 with original (160,000 miles) rerouted throttle cables have less resistance than my 2000 with the upgraded new style cables. The next time I have my 2000 & my 2004 apart I'll reroute the 2000 cables. I'll need both bikes apart at the same time because I can't remember how I routed the 2004 cables.

Dave Selvig
2004 Black LT
2000 Canon Red LT



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post #4 of 11 Old May 12th, 2012, 8:13 pm
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Re: Just how heavy is a heavy throttle ?

Pretty ingenious setup! I made the change but had the bike down for 6 weeks and couldn't remember how it felt before the change, other than to know it was better.

Thanks,

Jim H.
K1200LT '00 for Touring, '73 Norton for fun
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post #5 of 11 Old May 12th, 2012, 10:06 pm
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Re: Just how heavy is a heavy throttle ?

Not for nothing..
I felt mine was really hard to roll,didn't really snap back good on it's own either.
Today I pulled the cover off the throttle and sprayed it with wd-40.
Huge diff!
I'm going to get some lithium based grease next.

For kicks i took the fairing off of one side..top and bottom.
Not to bad a job..still couldn't see much!
Actually I was looking for that cruise switch.
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post #6 of 11 Old May 13th, 2012, 9:34 am
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Re: Just how heavy is a heavy throttle ?

Quote:
Originally Posted by saddleman
My 2004 with original (160,000 miles) rerouted throttle cables have less resistance than my 2000 with the upgraded new style cables. The next time I have my 2000 & my 2004 apart I'll reroute the 2000 cables. I'll need both bikes apart at the same time because I can't remember how I routed the 2004 cables.

When you get done, PLEASE, pictures.
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post #7 of 11 Old May 13th, 2012, 9:56 am
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Re: Just how heavy is a heavy throttle ?

I had the cables on my 2002 replaced by a BMW dealership and there isn't much difference from the old ones. It's still pretty hard to twist the throttle. What are some things I can check that might make it better?

******

Al Strickland
Blairsville, Georgia
1967 Honda Cub
1972 Honda CB350
1979 Suzuki GS750E
2001 R1150GS (gone -- victim of a Highway 28 curve)
2002 K1200LT Trike (now history, transmission died)
2009 R1200GS
2013 K1600GTL
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post #8 of 11 Old May 25th, 2013, 7:03 pm
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Re: Just how heavy is a heavy throttle ?

It still rolls to closed, but is heaviest I've felt on any bike I've ridden. Had 10 miles stop and go city driving when got back and could feel it in my wrists and forearm when got home.
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post #9 of 11 Old May 27th, 2013, 12:16 am
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Re: Just how heavy is a heavy throttle ?

Quote:
Originally Posted by wolfie3491
It still rolls to closed, but is heaviest I've felt on any bike I've ridden. Had 10 miles stop and go city driving when got back and could feel it in my wrists and forearm when got home.
Until you can get it sorted to your satisfaction, try using a throttle-rocker.... cheap investment and takes the pressure off your wrist by using the palm of the hand to help open the throttle. http://throttlerocker.com/

Chris
Sydney, NSW
2005 Dark Graphite Metallic K1200LT
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post #10 of 11 Old May 27th, 2013, 5:48 pm
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Re: Just how heavy is a heavy throttle ?

Quote:
Originally Posted by Bones1955
Not for nothing..
I felt mine was really hard to roll,didn't really snap back good on it's own either.
Today I pulled the cover off the throttle and sprayed it with wd-40.
Huge diff!
I'm going to get some lithium based grease next.

For kicks i took the fairing off of one side..top and bottom.
Not to bad a job..still couldn't see much!
Actually I was looking for that cruise switch.

I would not recommend using any grease simply because it will catch sand and grit and make things worse after a while. A dry lube for locks or guns would be a better choice.

53 MPG and life just keeps getting better

2001 Triumph Sprint ST [sold]
2000 K1200LT 'Nimitz'
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post #11 of 11 Old May 27th, 2013, 6:30 pm
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Re: Just how heavy is a heavy throttle ?

Quote:
Originally Posted by Bones1955
Not for nothing..
I felt mine was really hard to roll,didn't really snap back good on it's own either.
Today I pulled the cover off the throttle and sprayed it with wd-40.
Huge diff!
I'm going to get some lithium based grease next.

For kicks i took the fairing off of one side..top and bottom.
Not to bad a job..still couldn't see much!
Actually I was looking for that cruise switch.
The inner liners on the cables can swell from any petroleum products & could make it worse after a while.

Dave Selvig
2004 Black LT
2000 Canon Red LT



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