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tony_termite said:
Does anyone know what speed is safely capable of with full lugage and 2 up on the autobahn's?
If your "full luggage" includes a BMW 49 liter top case, then BMW's literature says that you should not exceed 180 kph = 112 mph. I have friends who have far exceeded that speed as solo riders without incident, but I have never tried it myself. I do not know if anyone has gone above the 49 liter top case limit while riding two-up.

Tires have load ratings and speed ratings. Your motorcycle has a GVWR too.

I am not aware of any other "top safe speed" listed in BMW's documentation or literature for a KGT. Obviously, if you are planning to ride the Autobahn at high speeds, then you will make sure that everything is in perfect working order, tire pressures are correct, and both rider and passenger are fully geared up.
 

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Discussion Starter #3
Its funny that at 110mph with boxes 2 up it was fine.

at 130mph it started to get hot water temp was up to full but not alarming think the aerodynamics and loading needed to push it through
 

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You're better off two-up for high speeds than solo with top box, as the top box can act as a large wind sail hanging way out there. With a passenger filling in the space between the rider and top box, the wind flows around it much more smoothly, creating less turbulence and minimizing instability.

The bike itself is stable up to 150 mph or so . . . :D

As for the overheating, these bikes tend to collect a lot of crud up in between the radiator fins, minimizing the overall cooling effectiveness. It's possible that your radiator is working just OK at normal speeds, but the extra load from high-speed riding is overtaxing the partially clogged radiator.

Some riders have had some luck carefully using a self-serve car wash to help flush gunk off of the radiator. Very carefully use the high-pressure wand to clean the radiator fins. It's better to do this from the back, although that's hard to do on the GT without removing body panels.

I also recommend a full radiator clean at every 18K service. You have to pull the radiator to do the valve check, so while it's off the bike, give it a thorough inspection and cleaning.

Some riders have also had good luck adding some metal or fiberglass screen mesh in front of the radiator. This mesh tends to collect the crud before it gets embedded in the radiator fins, and is easier to clean, or just replace when it gets too bad.

That should help minimize your overheating problems.

BTW, when you get Porsches or Mercedes crawling up your äss at 130 mph in the left lane, just pull over and let them by. You'll just pass them right back as soon as you near a city and the traffic gets thick. :D
 

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Clean the radiator

Ideally I wanted to push the crud (bugs, dirt etc.) out from between the rad fins the same it came in, so from back to front. Removed the left and right side body panels and the rad shroud. Then made temporary (think duct tape and copper elbow) 90 degree fittings for a water hose and an air hose. Soaked the rad well and let it stand for a while to soften. Then used water pressure and then the air hose to carefully push the crud out. I finished with a shop vac sucking from the front. Hard to get at all of the rad with the fan in place and as Meese says the best way is have it cleaned whilst doing valve check. But this got most of it and cured an overheating problem that had gotten so bad that it would overheat if I was going less than 40 mph.

As for top speed loaded? seemed stable enough to me up to 130 fully loaded one-up and two-up though spouse wasn't too keen on it...

PS, who's adding the ad hyperlink to the word rad-e-ate-or?
 

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Ride two up most of the time but only use a tank bag and 55l BM soft bag on the back the clock will show just over 160 with a 1000 revs to the redline which it won't pull and I've done that several times,but the panniers are another ball game and hence why I don't like e'm and not just for the above.
 

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Rode to Williams, AZ on the "new to me" K13GT a couple of weeks ago... Very long, straight stretch of road in front of me with nothing on the horizon coming my way and 7 fellow hardcore badass biker gang members behind :nerd: Asked my girl if she wanted to see how fast it would go and she called my bluff answering with an enthusiastic "Yes!" Didn't bother downshifting, just pinned it and off we went, loaded with a long weekend's worth of stuff, the speedo hit 150 and I rolled out of it, deciding that was fast enough. I can attest, Big Red was still pulling hard when I chickened out... GPS confirmed 146 mph. Not too shabby for a "touring" bike :teeth
 

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BigBite said:
Not too shabby for a "touring" bike :teeth
Yeah, we know . . . :ricky
 

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A couple years ago my wife and I were two up on our '06GT with 49ltr top case and full paniers in Nevada. I was doinf 120mph and it was smooth as silk. As I mentioned that fact a copper poked his head out of a group of on coming cars about 5 miles down the road (very open desert). I hauled down as fast I could but as we passsed he did a flip and turned on his lights.

I got a ticket for 92mph. Afterward he asked as if we were old friends....really how fast were you going?. I looked at the ticket and said..."It says here 92"

Never admit to anything other than what they know.

The bike is very stable at 120....and I've had it solo up to 164...but I was worried about the panniers....should have left them off that day. :teeth
 

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I vaguely remembered that for the old K's it was a conservative 80mph with full luggage. As everybody says, how the bike is loaded, type of luggage and pillion all make a difference.

But the thing that can catch you out is sudden side wind and fast overtaking large vehicles. High speed in a straight line with no crosswind is one thing, but a sudden side wind gust can make your ride very scary.

Having had one bad learning experience with side wind on a long sweeper I now look at the clues ahead like open space gaps either side of the carriageway with flat country and trees shaped from the prevailing wind aligned across my ride path.



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Ive done 160 mph on the gauge with panniers fully extended and a duffel bag tied to the back of my K12R. I don't think the tires would last long at that clip. The panniers did stay on tho. At least they engineered that well.
 
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