Join Date: Nov 2011
Location: Reading, Berkshire, UK
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.
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.
2001 K1200LT Bought Nov 2011
1963 Norton Electra 400
1960 Norton Navigator Delux 350
1977 Norton Commando 850 MkIII, owned since new.