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Discussion Starter #1
Hi guys,
Just purchased a 2002 K1200RS, and the throttle works hard compared to all
my other bikes. Is this typical of the K bikes, or should I be looking to see if
someone put a heavier return spring on the throttle bodies??
 

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Hi guys,
Just purchased a 2002 K1200RS, and the throttle works hard compared to all
my other bikes. Is this typical of the K bikes, or should I be looking to see if
someone put a heavier return spring on the throttle bodies??
By design, the spring on throttle-bodies are a bit stiff (1 or 2 springs depending on version and cruise-control).

EVEN MORE SO if your K1200RS is equipped with factory cruise-control. The cruise became an available "factory installed" option beginning in 2002 for USA market. In such case, there is a 2nd throttle-cable often called the "return cable" (and a 2nd spring on TB pulley).

In addition, because of the 2nd "return / push" throttle cable needed by cruise, you get the friction of both cables (hence strong spring needed). If one or both cable is old or a bit damaged / worn inside, you will get more friction over time (with age). On mine, after 8 years and 65,000 miles (around 2010), I installed brand new throttle cables of the most recent version. Nowadays, only this later "improved" version of the cables is available on BMW parts fiche. If you have custom bar-risers, you can order the K1200GT 2003-2005 throttle cables that are 1 inch longer (same design).

The new throttle cables are better designed with lower friction material inside (think it is a teflon liner) - because of this BMW says not to lube with any petrolium based product. At throttle twist-grip attach point, you can check if you see this liner inside as it is longer than needed to help friction in curved section of the cables. Older cables did NOT have this somewhat "clear" liner visible in same section (see 2nd photo..)

Furthermore, a very common problem over time (other than worn cables) is dirt that has accumulated between metal right handlebar AND plastic throttle rotating sleeve (under rubber grip). Easy to check or feel this when throttle cables are disconnected.
 

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My 2003 K1200GT with 27k miles similar to your's also has quite a firm twist. Definitely not sloppy or loose. My wrist gets tired on the highway after an hour ride. I would use cruise control but traffic is too crazy to relax.

Maybe you can locate a similar K bike at a dealer to compare. The paper Clymer shop manual ($35 on Ebay) is worth the purchase and has good descriptions on the throttle experience, maintenance, etc.

Sailor was right on target regarding all the mechanics going on with a K bike. It's a fancy setup. Nothing like my old Honda 1975 CL350 with one cable pulling the carbs.

Welcome to the K1200 bikes. Lots of speed, control and braking features.
 

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Discussion Starter #5
Thank you jrmull, I have a 2004 Rockster that I always thought was stiff compared to my other bikes, but this
K bike is really tough on the wrist. I am going to follow up on what sailor advised, hope that helps or I'll be riding
my other bikes more than the K. Cheers!!
 

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Well BettleJuice, with the wild horses you are holding on to, imagine if the throttle was loose and easy ! Maybe it is keeping you from falling off the seat. Put it in 2nd or 3rd gear and push it to redline area. Report back your findings. Regards John
 

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If nothing else, try one of the "throttle rocker" assist devices. I had one on mine. Look for the one that attaches with a velcro strap rather than plastic. Easier on the hand grip. I thought mine was an easy improvement.
 

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I had to do some maintenance on my bike yesterday.Lots of crap accumulated in the throttle tube and binding the throttle.

WD40 sprayed liberally into the 3 holes at the end of the heated grip and then I sopped the gritty grey slurry that came out.

Mind you.....all that throttle maintenance/inspection was done over the last winter.Just had to do it again but bike has been through a lot of rain.....dust and road crap since.
 

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Throttlebody rail may need lubricating Also in my case a mouse built a nest under and in back off the throttlebody rail. Blowing compressed air through there I’ll tell you.
 
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