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Old 04-29-2014, 04:14 AM   #1
KTMBLAG OP
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poor top end speed

Hi everyone, not that I care about top end speed, my concern is that there is something wrong with my bike. I have a 2011 f800gs and it won't do 100mph. I appreciate I'm not the lightest of riders and I've added weight to the bike ie crashbars baseplate. But would have thought 100mph was still achievable. I'm running 17. 41
Sprockets. The bike just won't pull in higher gears. Will pull 85 in third and around 95 in 4/5/6, any thoughts
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Old 04-29-2014, 04:28 AM   #2
DetoX68
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Go to the gym?
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Old 04-29-2014, 04:51 AM   #3
FredRydr
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Quote:
Originally Posted by DetoX68 View Post
Go to the gym?
My gym won't allow me access on my bike, especially if I'm riding over 100mph.

If everything is in tune, perhaps your bike was re-mapped to two-star by a prior owner.

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Old 04-29-2014, 06:21 AM   #4
Bumbobee
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Something is wrong with your bike because I can do 160 km/he like it's nothing 2up with my gf.

I weigh 220 pounds she weighs 115
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Old 04-29-2014, 06:56 AM   #5
Reaver
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So you're saying it won't redline in the higher gears? I'd be thinking you've lost some compression and/or are using cheap gas.

Mine's mapped for regular gas and in full touring mode (3 full cases and two tanks full) it'll cruise at 100mph and still want more. I keep it to 85 but it's more than willing. '09 with mileage getting up there.
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Old 04-29-2014, 08:01 AM   #6
KTMBLAG OP
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[QUOTE=Reaver;24046821]So you're saying it won't redline in the higher gears? I'd be thinking you've lost some compression and/or are using cheap gas.

Won't get nowhere near redline in 5/6
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Old 04-29-2014, 08:15 AM   #7
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Somethin' aint right then. Do you have a barn door windscreen?

I've never had mine wide open on the highway to the point it stopped accelerating. It'd be way too fast. It's rated for 200 KMH (so they say) but I think they'd go higher.
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Old 04-29-2014, 08:22 AM   #8
itsatdm
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This something recent? Like about the time you added your auxiliary fuel tank? How does it accelerate?

I am just wondering if there is a vacuum issue that prevents the fuel pump from delivering the flow needed.
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Old 04-29-2014, 08:56 AM   #9
KTMBLAG OP
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I have the standard screen on but that would be a good way to describe the problem. Wind drag,
The problem was there before the tank was fitted
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Old 04-29-2014, 09:05 AM   #10
KTMBLAG OP
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Acceleration seems fine
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Old 04-29-2014, 09:21 AM   #11
Reaver
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Know anybody with a GS911? You can read fault codes without having to "add' the bike to the unit thereby taking up one slot. I'd look for fuel issues. Top gear WOT will demand the most fuel. Having a partially clogged filter, weak pump or failing FPC or FPR will do that. (fuel pump controller, fuel pressure regulator)

Is it uphill both ways in a headwind where you ride?
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Old 04-29-2014, 09:25 AM   #12
KTMBLAG OP
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Is it uphill both ways in a headwind where you ride? [/QUOTE]

That is a perfect explanation like it, thanks for the ideas bud
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Old 04-29-2014, 09:56 AM   #13
Rgconner
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Yeah, 100 is no problem on the F700, even with big screen and all 3 bags on, 260lbs pilot.
So an F800 ought to do it.
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Old 04-29-2014, 10:17 AM   #14
Bayner
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I've gone up to 190 kph twice before wimping out and slowing down, but the bike had no issues getting there. I'm sure it would have redlined without issue.
Does it have a noticeable decrease in acceleration at some point or does it just taper off gradually? I find mine tends to increase acceleration rate above 6k rpm.
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Old 04-29-2014, 10:23 AM   #15
jengel451
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Air filter good? Any dents in the exhaust?

Some things that could keep an engine from pulling all the way to redline at full power.

Intake restriction
Exhaust restriction
Lack of fuel pressure or restriction in flow (Injectors could be dirty etc.)
Low compression
Uncommon, but valves not opening all the way (you'd probably hear loud valves at idle though)

just some high level low hanging fruit to check.
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