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Old Aug 14th, 2006, 6:01 pm   #1 (permalink)
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748 Top Speed?

So, I have a 2000 Duc 748 with factory gearing, Termi half system and Magnisum wheels. I used to think that 145 was all it had in it, but now I'm not sure. The speedo read 150 while in 5th gear today before I backed off (cars, cops and shit like that.) I have no doubt the speedo is in-accurate, but I still want to know what it will do without really having to do it myself. Does anybody have any ideas? Oh yeah, I got a tall corse wind screen that I tuck in behind pretty good. Thanks.

P.S. North Dakota has the stupidest straight roads that are reasonably safe and are good for nothing else except going as fast as your bike can and getting busted for it. F*ck'n straight liners.
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Old Aug 14th, 2006, 6:34 pm   #2 (permalink)
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150 in 5th?????


What RPM were you at?
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Old Aug 14th, 2006, 6:41 pm   #3 (permalink)
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The 748 will be at the revlimiter at exactly 150 in 5th. It's geared to pull 156 in 6th, at max power RPM.
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Old Aug 14th, 2006, 7:49 pm   #4 (permalink)
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Top speed

Yeah, I had just bounced off the limiter at around 150. Only 156 in 6th, I wouldn't be supprised. So is that speedo close to being accurate? I know the Jap bikes are way off. Hell, they can't get tachs to read right either.
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Old Aug 14th, 2006, 7:58 pm   #5 (permalink)
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your speedo will never be exact because you have to take tire wear into effect. unless you only ride with new tires every time, and who even knows if they calibrated the speedo with the tires they actually installed at the factory. there was an article about this in motorcyclist a year or two ago and they measured a 999 to be around 7mph off at Vmax. (not sure if that was with new tires or not, i'll look for the article.)
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Old Aug 14th, 2006, 8:06 pm   #6 (permalink)
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Quote:
Originally Posted by Bravo51
So, I have a 2000 Duc 748 with factory gearing, Termi half system and Magnisum wheels. I used to think that 145 was all it had in it, but now I'm not sure. The speedo read 150 while in 5th gear today before I backed off (cars, cops and shit like that.) I have no doubt the speedo is in-accurate, but I still want to know what it will do without really having to do it myself. Does anybody have any ideas? Oh yeah, I got a tall corse wind screen that I tuck in behind pretty good. Thanks.

P.S. North Dakota has the stupidest straight roads that are reasonably safe and are good for nothing else except going as fast as your bike can and getting busted for it. F*ck'n straight liners.
Use a GPS, to measure your speed.

I added a Sigma bicycle computer to get accurate speed and use a GPS to calibrate it.
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Old Aug 14th, 2006, 8:12 pm   #7 (permalink)
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Gps

That GPS is a good idea, but I'm not that curious. I have the microsoft streets and trips for the lap top, I run it in the truck, but it kind of sucks. I don't think the refresh rate keeps up with anything over 100 mph.
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Old Aug 14th, 2006, 8:28 pm   #8 (permalink)
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http://www.xs4all.nl/%7Eator0437/gc/

This site will tell you your top speed of each gear and you can change it to whatever sprocket ratio you have
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Old Aug 15th, 2006, 9:09 am   #9 (permalink)
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Keep in mind mechanical speedometers have a margin of error. A percentage they are off...so the faster you go, the less accurate they are if that makes sense. So figure you are going 43 when the speedo reads 45 then at 86 the speedo reads 90...etc...that's not exact but just so you get the idea.

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Old Aug 15th, 2006, 9:16 am   #10 (permalink)
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I think i speak for most of us when i say..

ENOUGH..

I┤ve outgunned a BMW X5 4.8 with 14/40 gearing. I have NO idea how fast it was, but I┤m guessing around 145-150 MPH.. I hit the limiter in 6:th gear with no problems.

//amullo
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