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Another Top Speed Question (Read 319 times)
ralfyguy
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Another Top Speed Question
08/03/08 at 07:56:05
Does this sound normal?
80F outside = 95mph Top Speed
105F outside = 85mph Top Speed
Would the heat make such a difference?
Or is this fiction?
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buttgoat1
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Re: Another Top Speed Question
Reply #1 -
08/03/08 at 10:18:20
hotter temps = less dense air
less dense air means less oxygen for optimum combustion and less power
that is a pretty big difference though, and 95 is a bit more top end than expected, I would thing that a tail/headwind would also account for the large discrepancy.
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itschnobigdeal
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Re: Another Top Speed Question
Reply #2 -
08/03/08 at 10:20:12
Humidity could play a factor as well.
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Jay
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Re: Another Top Speed Question
Reply #3 -
08/03/08 at 17:40:29
It's been over a hundred degrees here, and the bike really seems to be feeling the heat. Performance has been down somewhat, but not quite to the extent that you're reporting. Then again, I've never even got close to 95mph.
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mick
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Re: Another Top Speed Question
Reply #4 -
08/03/08 at 23:53:13
95 mph ! wow! when I got my bike 3 years ago top speed was 80,after a few mods,150 main jet,Jardene drag muffler,K&N filter,iridium spark plug, I can now get up to 85,with the mods I seem to get there quicker.
I think maybe your speedo is off a bit mate.
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4carbcorvair
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Re: Another Top Speed Question
Reply #5 -
08/04/08 at 04:33:29
I had mine up to 80 with some throttle left. 95-100 sounds about right on a good day.
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ralfyguy
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Re: Another Top Speed Question
Reply #6 -
08/04/08 at 04:40:30
mick wrote
on 08/03/08 at 23:53:13:
95 mph ! wow! when I got my bike 3 years ago top speed was 80,after a few mods,150 main jet,Jardene drag muffler,K&N filter,iridium spark plug, I can now get up to 85,with the mods I seem to get there quicker.
I think maybe your speedo is off a bit mate.
The other day I was riding in front and my wife behind me in the cage. I had my son on the back and we were going to the lake. He wanted to ride the motorcycle there. Speed limit was 70mph. So we were going around 75mph. My wife hept falling behind, and I had to slow down to about 65mph every now and then for her to catch up. When we got there, I asked her why she was going so slow all the time. And she said she was doing 80 most of the time and didn't wanna go any faster. So when I did 75mph on the bike, she was doing 80mph. Weird.
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bill67
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Re: Another Top Speed Question
Reply #7 -
08/04/08 at 04:49:44
That means yours will do 100mph by your wifes car right.
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william h krumpen
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ralfyguy
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Re: Another Top Speed Question
Reply #8 -
08/04/08 at 10:27:11
bill67 wrote
on 08/04/08 at 04:49:44:
That means yours will do 100mph by your wifes car right.
Maybe the wife's car speedo is even more off. Dunno
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Sandy Koocanusa
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Re: Another Top Speed Question
Reply #9 -
08/04/08 at 19:29:52
4carbcorvair wrote
on 08/04/08 at 04:33:29:
I had mine up to 80 with some throttle left. 95-100 sounds about right on a good day.
If it's anything like mine, you have throttle
movement
left. When I hit 80, I'm at about 13/16 open throttle. The rest of it gives me a whopping 3 mph. No matter what I do, I can't seem to break 83 on the level. That's with a 155 main. I don't know how these guys are able to fly along at 95.
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Savage: (adj)1. Wild 2. Uncivilized : Primitive 3. Ferocious 4. Cruel or merciless : Brutal --- Webster's. (n.) 1. A motorcycle named for its seat.--- Sandy's unabridged
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J Mac
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Re: Another Top Speed Question
Reply #10 -
08/04/08 at 22:09:05
I hit around 85 the other day, and that was maxed out pretty much. 150 main jet compliments of ReelThing. Temperature in the 90s. I think my losing the 30 lbs I should might help my top speed. Going 85 burns way too much gas, and it's unsafe, so I don't do it often.
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verslagen1
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Re: Another Top Speed Question
Reply #11 -
08/04/08 at 22:39:43
every once in a while going home, I have a hill I let her have her head. It's the kinda grade cagers slow 5 to 10 if they're not watching. And trucks labor up.
It's my testing ground. 87 in the winter, 85 now. wondered where the 2 miles went. went up in the heat.
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Jack_650
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Re: Another Top Speed Question
Reply #12 -
08/05/08 at 08:14:46
Seems to me from all that I hear that our speedos are usually not the most accurate items by a long shot. I know mine's off by 5%-10% depending on the back tire. It's never been closer than the 5% though. I've had it checked by radar, other bikes and vehicles as well as running a hundred miles of interstate markers on several occasions. Mine reads sixty, I'm usually going close to seventy.
I guess what I'm saying is is to take it out and get it checked. Either go the mile marker route or have a friendly constable check it for you. Then figure out how fast you're "really" going.
Jack
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Gary On A Savage
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Re: Another Top Speed Question
Reply #13 -
08/05/08 at 11:14:25
86 MPH is the most I've done (using an accurate bicycle speedo). 80 MPH at 1/2 throttle is typical. Pod filter/turnout pipe/155 main, still can't break thru 90. I think the biggest issue is aerodynamics. I have a large windshield on the front that I think is producing too much drag. Not enough HP to kick it up.
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Brandon
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Re: Another Top Speed Question
Reply #14 -
08/07/08 at 20:30:57
The 5-0 around here sets up those little radar stations that tell you how fast you are going and I've checked using one, I am off by about 5 mph, give or take 1-2. But I've also heard that a radar gun can range +/-7mph, its a law in alabama that a speeding ticket must be at least 7mph over the limit because of that discrepency.
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