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Post by KSR Moto on Jan 8, 2019 15:07:40 GMT -5
Like many of you guys know speedometers on 50cc scoots tend to be very optimistic, is there any way to "calibrate" them?, I was thinking about printing out a different background with corrected numbers for it, but my speedo needle goes up to 55mph and then stops going up but the scoot is still accelerating LoL
And I already have a huge wheel, it is 110/90/12 the lagrest I can go
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Post by aeroxbud on Jan 8, 2019 15:53:11 GMT -5
I think by law they have to measure over. Normally about 10%. After using a GPS speed app I know roughly how far out it is. Then just drive to the rough speed. Years ago On my motorcycle when I changed my gearing, I used something called a Speedo healer. It was a little box you plugged into the cable to alter the speed. On my Aerox it used to go right round the face. way past the end of the speedo. All the way past the temperature gauge. 😁
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Post by 90GTVert on Jan 8, 2019 15:54:50 GMT -5
There is no calibration. Putting an overlay on there could work, but you'd need to either figure out the percentage that it's off or use a GPS to find what speedo reading is what actual speed. Most likely it's off by a percentage rather than x MPH.
There are 3 common solutions :
1) Just know it's a little off and deal with it. 2) Put a phone or GPS mount on the bars and use that for a speedo. 3) Install an aftermarket speedo that can be calibrated.
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Post by tiny on Jan 8, 2019 18:45:50 GMT -5
Not all 50cc are off. Our Vinos are both dead on in terms of accuracy while my KYMCO 50s are off by 10%. My first 150 was off by 10% while my current on is spot on. I deal with the speedometer til i can rig up something more accurate. Nut i know that while it says 80kph im really at 70-72kph
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Post by FrankenMech on Jan 10, 2019 3:43:38 GMT -5
By law (in the US) they must never read slow, but there is no regulation, that I know of, on how much they can or must read over. They can be spot on, or a little fast, just never slow.
The 3 common solutions listed by Brent are good.
The 'speedo healers' are available at commercial speedometer repair and calibration shops.
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Post by tiny on Jan 10, 2019 7:40:40 GMT -5
For road vehicles (not including motorcycles/scooters) buy law can not be no more then plus/minus 6% from the factory. Changing out the stock diameter wheels and tyres for larger diameter ones will affect the speedometer and its up to the owner to have it recalibrated. And no the cops will not use that as an excuse for speeding. The guys i know will just give the driver an extra ticket to go with the speeding one.
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Post by repherence2 on Jan 11, 2019 21:48:44 GMT -5
I calibrated my speedometer by using a Speed Limit sign that also has the radar and digital readout that gives you your real time speed. it was along the main road as I entered my district. speed limit sign says 35 but everyone does 45. I took the clear plastic cover off of my speedo cluster. lifted the speedo needle up and over the pin/stopper at the Zero mark. once you do that, the needle come to natural resting position past the pin. my needle rested at about -7mph. I marked that location as a reference point. then I popped the speedo needle off and softly reinstalled it to approximately -2mph. then I took a ride past the sign to check the needle's position against the digital display of the speed limit sign. I calibrated my needle to 45mph on the gage face. the gage scale ends at 50mph. my needle could go off scale past the 50mph mark. so I measured the chord width between each 10mph increment on the gage face and it came out to 17mm. so I rotated the needle past 50 and when the needle got to 17mm past the 50 mark, I marked that point with a sharpie. then continued on for another 17mm and put another mark there. after that, my needle maxes out against the side wall of the clear cover. I calibrated mine to 45 because "moped" law here in Hawaii limits you to 33mph. if you get caught going faster than 33 you get ticketed here. but it could go way past 50, I got ticked for 49 in a 35 and kept the ticked as "proof of speed" because I wasn't even at full throttle.
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