Hi all
Old thread i know, but while i have the bike in pieces i thought i would show a few photos and a little experiment i did in reference to the OP.
even with a quick action throttle i still found that getting on the throttle met with a delay to getting any power to pull the bike out of tight corners.
I marked some positions on the throttle housing and noted that with the standard setup at the throttle body, half throttle at the grip was giving less than 1/4 throttle butterfly at the throttle body. You will see that the black plastic pulley has a flatfish shallow profile at the start then goes into a steeper curve further along. Removing the roller and adjusting the black plastic stop screw and adjusting the slack in the cable allows the pin to sit on the start of the steeper curve. Missing out the flatter first section. Result being it gives a linear action and half throttle at the grip equates to 1/2 throttle at the butterflies in the throttle body. Don't know how this will affect wear on the plastic pulley as yet. Its a solution but i,m still looking at other options.
[URL=http://s905.photobucket.com/user/bmwgusr1100s/media/DSC04582.jpg
You can see that the pin sits closer to the start of the curve in this pick. With the roller fitted and as standard it is sat further back on the flatter portion of the black pulley.
gus
How easy/difficult is it to do this Gus? (The throttle body casings I mean as I can see the roller bit is easy) Also , I'm guessing that this won't be too extreme and perfectly acceptable for the road. Given that there is no longer a roller, is the throttle any harder to 'twist'? . I'm sure someone posted this mod a while back (with a Pic of that roller) but he didn't do the mod himself. I'm sure he said that it was great on the road. I'd like to do this. It would make a big difference to my wrist and I want the 'instant grunt' back that I had with the 11S.
BTW I already have the plastic insert at the twist grip end. I should imagine it would be an idea to remove this with the roller mod.
R1200R TC
R1200GS TC. Triple Black. It has to go sadly...
R1200S. It’s gone. Had it 11yrs. My favourite bike in 44yrs riding.
f90x wrote:How easy/difficult is it to do this Gus? (The throttle body casings I mean as I can see the roller bit is easy) Also , I'm guessing that this won't be too extreme and perfectly acceptable for the road. Given that there is no longer a roller, is the throttle any harder to 'twist'? . I'm sure someone posted this mod a while back (with a Pic of that roller) but he didn't do the mod himself. I'm sure he said that it was great on the road. I'd like to do this. It would make a big difference to my wrist and I want the 'instant grunt' back that I had with the 11S.
BTW I already have the plastic insert at the twist grip end. I should imagine it would be an idea to remove this with the roller mod.
Hi
It's quite easy to do. The clips holding the throttle bodies come off easy and can be reused. Disconnect cables and remove injectors. A throttle body synch will be needed after. You have to adjust the cables quite a bit to take up the slack. The throttle seems to be no harder to twist. I would still keep the insert at the twist grip. You will see when you have it apart just how non linear the action is.
All the best
Gus
Droptarotter wrote:Thank for the great explanation Gus. I never understood how removing that roller would give us a quicker throttle pull.
Now I do!
What about fitting HP2 throttle bodies? Or is that just cost prohibitive?
I did try one of the gizmo's that attach at the grip area, but it only decreased the pull marginally.
Cheers
Hi
Too much money for the HP2 throttle bodies
I,m still looking into some other way of solving this problem. I may ask about having the throttle bodies modified to take a different pulley.
Gus
f90x wrote:How easy/difficult is it to do this Gus? (The throttle body casings I mean as I can see the roller bit is easy) Also , I'm guessing that this won't be too extreme and perfectly acceptable for the road. Given that there is no longer a roller, is the throttle any harder to 'twist'? . I'm sure someone posted this mod a while back (with a Pic of that roller) but he didn't do the mod himself. I'm sure he said that it was great on the road. I'd like to do this. It would make a big difference to my wrist and I want the 'instant grunt' back that I had with the 11S.
BTW I already have the plastic insert at the twist grip end. I should imagine it would be an idea to remove this with the roller mod.
Hi
It's quite easy to do. The clips holding the throttle bodies come off easy and can be reused. Disconnect cables and remove injectors. A throttle body synch will be needed after. You have to adjust the cables quite a bit to take up the slack. The throttle seems to be no harder to twist. I would still keep the insert at the twist grip. You will see when you have it apart just how non linear the action is.
All the best
Gus
Nice one, thanks Gus.
R1200R TC
R1200GS TC. Triple Black. It has to go sadly...
R1200S. It’s gone. Had it 11yrs. My favourite bike in 44yrs riding.
