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Post by layne43 on Sept 10, 2008 21:36:11 GMT -5
I know I have seen other posts about others that have a speedo that shows a inaccurate reading. Has anyone found a way to calibrate the speedometer so that it shows the right speed?
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Post by jpn on Sept 11, 2008 6:00:08 GMT -5
A popular solution on a Honda Reflex forum seems to be to scan the face of the speedometer, do a little cut and paste of the image to relocate the markings so that they are 'calibrated' to the needle, then print the image out on an Avery self-adhesive label.
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Post by vic6250 on Jun 1, 2012 15:06:15 GMT -5
I have a linhai 250 cc that read 10 percent fast. It came with 120/60-13 tires. I replaced the front tire with a 140/60-13 and it now indicates the speed absolutely correct. Just a lucky guess on the size, but I am tickled to death with the results'
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Post by chromestarhustler on Jun 1, 2012 15:46:53 GMT -5
yeah pull that sucker out and get a cheap gps unit of ebay. most of the garmins have a setting to make the whole display a speedometer.
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Post by fairweasel2323 on Jun 1, 2012 18:59:27 GMT -5
got a bar mount on my rear view mirror for my Tom Tom   |
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Post by leo on Jun 2, 2012 0:49:22 GMT -5
Has anyone found a way to calibrate the speedometer so that it shows the right speed? i have never seen any type of mechanical or electrical adjusters on speedos/ odos except the ones that are made for bicycles. the only way i know of to "adjust" a speedo is with the "brute force" method. 1. measure a straight line path of at least 3 miles, preferably 5. 2. ride this distance at least twice recording the odo before and after each time. 3. find the distance the odo records on each trip and average all of them. 4. divide the average by the actual measured distance. 5. the number you get is the multiplier you use with the speedo. make sure your tires are properly inflated before each trial run. the above method makes the assumption that the odo discrepancy can be applied to the speedo. by using the above method you can use any speedo made for any motorcycle on your ride. |
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Post by nulldevice on Jun 2, 2012 8:45:33 GMT -5
Odometer error is a mechanical gear train design error. Speedometer error is a poorly designed/manufacturer magnetic coupling error.
My experience has been the speedometer errors and odometer errors are two separate issues not related to each other. One scooter had a 20 percent speedometer error and the odometer had no significant error. Another scooter had a 15 percent speedometer error and the odometer had a 5 percent error. My current scooter has a variable 10-20 percent speedometer error and the odometer is off by 10 percent.
I just considered the gauges on my scooters as decorations to pass DOT regulations. For any measurement I consider important I put on an after market gauge.
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Post by Pony66 on Jun 2, 2012 9:12:29 GMT -5
I put 1/2" larger tires on my scooter and now the speedo is pretty accurate.
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Post by timk225 on Jun 3, 2012 20:25:39 GMT -5
My speedometer on my Jonway YY250T had a fairly consistent error in it that increased as the speed went up. I had tracked the error amount through the speed range with my GPS.
After thinking about it, I found the solution.
I took apart the instrument cluster and the odometer assembly to get access to the "bell" that is attached to the speedometer shaft. I turned it until the speedometer needle was pointing to 10 mph, then while holding the shaft there, I popped the speedometer needle off and put it back on pointing to 0 mph.
This has the effect of preloading the hairspring that returns the needle to 0 and resists its movement up the scale as speed increases.
New results? Accurate at 30, reading 1 mph high at 40, 1-2 mph high at 50, and 2-3 mph high at 60. Close enough for me!
The odometer is what I am really concerned about for gas mileage readings. But having the speedometer right is nice too.
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Post by chaz12 on Jun 3, 2012 23:10:40 GMT -5
;D I like the mirror idea. Mine is a Bali 250, which was the same type posted. I was wondering how I could hook up a GPS and now I know. Attachments:
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Post by leo on Jun 3, 2012 23:21:40 GMT -5
Odometer error is a mechanical gear train design error. yes, for OEM odos. different drive pucks and wrong or underinflated tires will give errors too. mine is decent enough to give me an idea as to the actual hours on my bike. not always easy to do with chinese bikes. it's not like you can go to (name brand store) and get a temp gauge or sending unit for your engine. ever try to get a fan sensor? |
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Post by nulldevice on Jun 4, 2012 17:29:58 GMT -5
I considered coolant temperature and voltage important enough to have respectable gauges which read with reasonable accuracy. I got a voltmeter from the local auto parts store and mounted it on the door to the coolant recovery bottle. I got a small temperature gauge off of Ebay and epoxied the sensor to the top radiator tank and the readout next to the voltmeter. There is a manual switch for the fan on the same door.
Be creative, mod your scooter with other source parts. If the original parts were junk the replacement will probably be too.
I do like the cheap GPS suggestion. I'm off to Ebay.
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