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Offline scooter1

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cb 500 top speed???
« on: July 23, 2009, 03:39:35 PM »
Hey guys my 1972 cb 500 top speed is 90 mph, is that the most  these bikes will do or is this bike faster???
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Offline Gordon

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Re: cb 500 top speed???
« Reply #1 on: July 23, 2009, 03:57:26 PM »
It's 37 years old.  Unless it's very low mileage and has been completely gone through or has been rebuilt I'd say 90 mph is commendable.  If it's in good mechanical condition it should top 100.  Even the 350 can do 100 in good condition. 
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Offline the technological J

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Re: cb 500 top speed???
« Reply #2 on: July 23, 2009, 05:09:18 PM »
i have a 78 550 i recently timed it and synched the carbs and i can top a hundred fairly easy but thats where she stops... i wind the gears to the red line and hit 100 as im coming into 4th... so i think in theory u can pull  a hundred if shes tuned right.. wind the piss out of third see where ur at then
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Offline scooter1

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Re: cb 500 top speed???
« Reply #3 on: July 23, 2009, 05:40:25 PM »
well thats good to hear, the bike runs great and 90 mph is plenty fast enough for me....thanks for your input guys.
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Offline Bill/BentON Racing

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Re: cb 500 top speed???
« Reply #4 on: July 23, 2009, 08:47:20 PM »
Yosh race bikes hit 140mph+.Bill
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Offline bryanj

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Re: cb 500 top speed???
« Reply #5 on: July 23, 2009, 10:11:39 PM »
230lb rider, folowing wind running good, just over 100
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Offline Deltarider

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Re: cb 500 top speed???
« Reply #6 on: July 24, 2009, 12:32:56 AM »
85kg rider. Winding the gears into redzone, I've managed 8500 rpm in 5th which equals 170 km/h (106 mph). Nose between the gauges. Bike is an original 1976 500K2 [ED] with standard #78 mains and airhorn.
« Last Edit: July 24, 2009, 01:46:48 AM by Deltarider »
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Offline the technological J

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Re: cb 500 top speed???
« Reply #7 on: July 24, 2009, 08:25:36 AM »
Quote from: Deltarider on July 24, 2009, 12:32:56 AM
85kg rider. Winding the gears into redzone, I've managed 8500 rpm in 5th which equals 170 km/h (106 mph). Nose between the gauges. Bike is an original 1976 500K2 [ED] with standard #78 mains and airhorn.

airhorn? is this carb related or do u sound like a semi?
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Offline my78k

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Re: cb 500 top speed???
« Reply #8 on: July 24, 2009, 08:27:30 AM »
Why are you guys quoting rider weight? Why no mention of gear ratios?
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Offline MCRider

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Re: cb 500 top speed???
« Reply #9 on: July 24, 2009, 08:32:25 AM »
Quote from: scooter1 on July 23, 2009, 03:39:35 PM
Hey guys my 1972 cb 500 top speed is 90 mph, is that the most  these bikes will do or is this bike faster???
Let's not forget that in perfect condition, speedos have a 10% error on average. With 35+ year old instrument, how much?

True top speed can only be had by GPS or such instrument. Properly calibrated digital modern thing.

Use a calculator like this and subtract 5% for clutch slippage. http://www.juric.org/mopar/tools/topspeed.php

We all think we are faster than we are, especially with some age.   ;D
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Offline MCRider

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Re: cb 500 top speed???
« Reply #10 on: July 24, 2009, 08:36:24 AM »
Of course I could be wrong. Heres a CB550 that can do 114!

http://motoprofi.com/motospecspictures/honda/cb_550_f_1-1976.html

Is that true TS, or calculated, or wishful thinking engineer.
« Last Edit: July 24, 2009, 08:39:30 AM by MCRider »
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Offline MCRider

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Re: cb 500 top speed???
« Reply #11 on: July 24, 2009, 08:38:59 AM »
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Offline MCRider

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Re: cb 500 top speed???
« Reply #12 on: July 24, 2009, 08:41:48 AM »
Back to the OP question, a true 90mph for your bike would be very good.
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Offline Deltarider

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Re: cb 500 top speed???
« Reply #13 on: July 24, 2009, 08:54:16 AM »
Quote
airhorn? is this carb related or do u sound like a semi?

It's a brilliant kind of nostril fitted above the filter and it's sniffing for extra air.

When it starts whistling you've reached Mach 1.
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Offline Gordon

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Re: cb 500 top speed???
« Reply #14 on: July 24, 2009, 09:51:57 AM »
Quote from: my78k on July 24, 2009, 08:27:30 AM
Why are you guys quoting rider weight? Why no mention of gear ratios?

Good point.  Overall weight has very little to do with attainable top speed.  Now if you're so enormous that you act like a sail attached to the bike, then you may be on to something. ;D
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Offline turboguzzi

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Re: cb 500 top speed???
« Reply #15 on: July 24, 2009, 02:28:33 PM »
top speed has too many variables to be a true sign of good tune. head wind, worn chain, gearing, binding brakes as well as rider "size"

Dyno's on the other hand are much more precise, so simple to use nowadays and the HP/torque graph wil give you much more information about your engine. 

Dont know about 500's, but cycle mag dynoed the 550 back then. 38 rwhp was the veredict if I remember right, so a top notch STOCK 500 should do 35 rwhp, a tired one around 32 I'd guess.

TG 


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