Heavy Throttle Spring? Any replacements? - K-Bikes.com - Excellence in Motion
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post #1 of 25 (permalink) Old Nov 13th, 2005, 8:30 pm Thread Starter
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Heavy Throttle Spring? Any replacements?

Hello All,
I always knew the K1200RS has a heavy throttle spring. Any reason why BMW put that in? I don't know what sense that it makes. I check out the throttle springs at the dealer, the new K1200S, and the R series all have lighter throttle springs.
I rode about 200 miles todays in the twisty....not only did my bike got a good workout, my right hand, connected to my shoulder got sore from twisting that dam heavy spring.
Any suggestions on what to do? Can one change it to a weaker spring?

Plastics
99 K1200RS (silver/blue)
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post #2 of 25 (permalink) Old Nov 13th, 2005, 8:38 pm
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Been discussed, there is a fix. Check the archives... Search for throttle spring
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post #3 of 25 (permalink) Old Nov 14th, 2005, 12:01 am
 
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Throttle rocker

I installed a throttle rocker. It's a handle on the ritht end of the grip and allows the palm to "twist" the throttle. I also considered installing covers over the gips to give them a larger diameter. There is a way to change the positions of the springs that reduces the tension, it is a difficult and complicated procedure, but check it out for yourself and make your own judgements.

Ron
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post #4 of 25 (permalink) Old Nov 14th, 2005, 12:34 am
 
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this may help

the written procedure is located in the achives.
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post #5 of 25 (permalink) Old Nov 14th, 2005, 5:40 am
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As Digs posted, the throttle spring mod makes the throttle so comfortable, I can now rest my palm on an open throttle during cruise, to excercise and reduce white knuckle vibes! I seem to remember you can choose how many springs you alter, I went for the full Monty, but check lock to lock that the throttle sliders always hit the bottom stops quickly with a click and there is free play in the cable (else your idle and ECU will suffer bad data feedback)

Before moving the springs, pass a piece of thread round the loop before moving it off the stock stop, just in case the spring wants to move all the way past its intended resting place.

I used a 8" lenth of 1/8 rod (modify a screwdriver) with a V groove notch cut in the end, to hold and manouvre the spring end to the new position.



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post #6 of 25 (permalink) Old Nov 14th, 2005, 9:24 am Thread Starter
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throttle spring

thanks all,
I do have a throttle rocker which helps a bit.
For for the throttle spring readjustment procedure, that doesn't seem like something I can do myself.. (I can only add gas, adjust tire pressure, check oil/replace)..so I'll have my mechanic take a look soon.

Plastics
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post #7 of 25 (permalink) Old Nov 14th, 2005, 10:17 am
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Quote:
Originally Posted by plastics
Hello All,
I always knew the K1200RS has a heavy throttle spring. Any reason why BMW put that in? I don't know what sense that it makes.
Plastics
99 K1200RS (silver/blue)
The heavy springs are neccessary to return a worn throttle cable, especially when making a tight left hand turn. This apparently bends the cable housing more than it already is.

I relaxed all 3 springs on mine a couple of years ago but recently ran into the cable sticking with slow speed tight left hand turns. Twisting the throttle was giving a delayed response. The most aft spring was reconnected and all seems to be working well now. However, a new throttle cable is on order.
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post #8 of 25 (permalink) Old Nov 14th, 2005, 2:59 pm
 
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Talking throttle spring

You just open up one turn on returnspring. Please remember, just one turn of the spring.
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post #9 of 25 (permalink) Old Nov 14th, 2005, 4:01 pm
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Before I slackened my springs, I checked the throttle cable run with bar risers fitted and added a light spring fixed to the cable outer and the centre yolk. Wherever my steering goes the cable always returns to the same place AND I can read the clock.



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post #10 of 25 (permalink) Old Nov 14th, 2005, 7:49 pm
 
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Coundn't find it in the archive at this site. Would very much like to know how to do this adjustment.
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