Author Topic: Speedo error on DT 300i  (Read 648 times)

CROSSBOLT

  • Hero Member
  • *****
  • Posts: 7764
  • West Tennessee, USA
    • View Profile
Speedo error on DT 300i
« on: September 13, 2019, 08:10:26 PM »
I have over 30000 miles experience on two identical 2013 Downtowns and today just noticed something about the speedometer graphics! With the handy Etrex 20 GPS mounted the trip to the barber is in progress and comparing indications on both devices it is apparent the speedo indication at 20, 30 and 40 mph is, for all practical purposes, right on. 50 is pretty close, maybe a whole .5 mph too fast indicated. 60 is actually 58.5 mph and 70 is about 68 and a smidge. THEN I noticed the big white tick marks are not the same distance apart! These are the marks at 10, 20, 30, etc. Every 10 mph is divided into ten divisions but some of them are SMALLER INTERVALS! The space between 50 and 60 is WAY SMALLER than between 10 and 20 or 100 and 110! Now, WHY would Kymco do that? What on earth was the idea behind taking a modern system of instrumentation with a tone wheel, pick-up, electronic processor and step motor instrument head and then dick around by diddling with where you put the numbers?

I am guessing it was done to get that "big" 110 number on the dial. Feel free to put other guesses on here because that is all we have at this point. I can live with a little indicator error but that is not the point. The point is, they had the makings of a virtually dead-nuts accurate indicator as a standard I thought all the manufacturers were striving all these years to attain and then this bunch screw it up on purpose!
Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

DanH

  • Full Member
  • ***
  • Posts: 105
  • San Diego, CA
    • View Profile
Re: Speedo error on DT 300i
« Reply #1 on: September 14, 2019, 11:24:12 AM »
Did something get lost between k/ph and m/ph?

It appears the m/ph has 11 arc segments, and the k/ph has 9 arc segments. The m/ph is more compressed.

Is the speedometer positioned so it faces the rider perpendicular (would support evenly spaced arc segments)?

Or is the speedometer positioned at an angle and its top tilts away from the rider (would support compressed arcs on top)?

« Last Edit: September 14, 2019, 11:48:59 AM by DanH »
2018 Kymco Like 200i (matte black)

CROSSBOLT

  • Hero Member
  • *****
  • Posts: 7764
  • West Tennessee, USA
    • View Profile
Re: Speedo error on DT 300i
« Reply #2 on: September 14, 2019, 01:39:25 PM »
Kymco did the same with the non-US speedo, too! I notice TPMS and ABS....

The tach is not that way!
Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

An Error Has Occurred!

Call to undefined function split()