Honda CG125 MPH to RPM

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Front Disc Brake model (2005) Test Ride flat out
3rd = 55mph (felt like a rev limiter cut in = 10500 rpm)
4th = 60 / 62mph (downhill, headwind)
5th = 60mph (same headwind, level ground)

The test ride seems to show there is a rev limiter at
10500 rpm. It also shows if the bike had a rpm dial the
red line would start at 9000 rpm and end at 10500 rpm.
9609rpm develops less power and torque than 8160rpm
I expect rev limiter is in the CDI (electronic ignition) box
  1999 CG 125 version
  with max speed indicators on
  speedometer for every gear
  1st = 21mph
  2nd = 32mph
  3rd = 45mph
  4th = 58mph
  5th = 70mph
  Peak Torque 7500 rpm
  Peak Power 8500 rpm
2002 km/h version with max speed on speedometer for every gear

Gear     km/h     mph
1          30         18.6
2          50         31.1
3          70         43.5
4          90         55.9
5          110       68.3
Peak Torque 7000 rpm
Peak Power 8500 rpm

Front Disc Brake Model (2004 to 2008)

                                Gear

                  1              2              3               4             5

mph                                                                          rpm
5              2129        1324        978           801         680
10            4257        2648        1957         1601       1360
15            6386        3972        2935         2402       2040
20            8515        5296        3913         3203       2720
25            10644      6619        4892         4004       3400
30                            7943        5870         4804       4080
35                            9267        6849         5605       4760
40                            10591      7827         6406       5440
45                                            8805         7207       6120
50                                            9784         8007       6800
55                                            10762       8808       7480
60                                                             9609       8160
65                                                             10410     8840
70                                                                            9520
75                                                                           10200
80                                                                           10880



 

Gear (% = Gear Gap)

                1              2              3              4               5

rpm          37.8%      26.1%      18.2%      15.1%     mph
7000        16.4         26.4         35.8          43.7        51.5
8000        18.8         30.2         40.9          50.0        58.8
9000        21.1         34.0         46.0          56.2        66.2

3500        8.2           13.2         17.9          21.9        25.7
4000        9.4           15.1         20.4          25.0        29.4
4500        10.6         17.0         23.0          28.1        33.1
5000        11.7         18.9         25.6          31.2        36.8
5500        12.9         20.8         28.1          34.3        40.4
6000        14.1         22.7         30.7          37.5        44.1
6500        15.3         24.5         33.2          40.6        47.8
7000        16.4         26.4         35.8          43.7        51.5
7500        17.6         28.3         38.3          46.8        55.1
8000        18.8         30.2         40.9          50.0        58.8
8500        20.0         32.1         43.4          53.1        62.5
9000        21.1         34.0         46.0          56.2        66.2
9500        22.3         35.9         48.6          59.3        69.9
10000      23.5         37.8         51.1          62.4        73.5
10500      24.7         39.7         53.7          65.6        77.2
11000      25.8         41.5         56.2          68.7        80.9



5500 rpm is my advised
warming up speed.
It's also the maximum speed
I would run a new engine in.
It probably takes 3.5 to 5
miles to warm up, dependant
on outside temperature.

I would not go past peak
power, the engines power will
dramatically drop off above
this (because its a pushrod
OHV engine, not OHC) and
increase engine wear.

If you use the bike above
7000rpm (51mph 5th Gear),
see the
Important Spark Plug
Information (extended high
speed riding part) and
Which Oil Quality to use in the
Servicing page.

Peak Torque = 7000 rpm, Peak Power = 9000 rpm, Generator Full Power = 5000 rpm

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