Dual Sporting Info from WashDirt.Com

 

HOW WIDE RATIO IS YOUR DIRT BIKE GEARBOX?  FIND OUT BELOW

A wide ratio gear box is handy for dual sporting because you can have first gear set for tight trail use, yet still do the speed limit comfortably on the open highway. Overall gearing is set by the rear and countershaft sprockets but the gearbox "width is fixed".   You can compare the "width of different bikes simply by dividing the first (low) gear ratio by the top (usually 5th) gear ratio. Below is a list comparing various dirt bikes.  Search for your bike by "edit" - "find" "dirtbike model".

DIRT BIKE MODEL                     GEARBOX WIDTH  (A BIGGER NUMBER IS "WIDER")

1975 Kawasaki KX250L3

1.80

5 speed

2 stroke

1973 Husqvarna 400CR

1.98

5 mxer

1975 Maico 250GP

1.99

5 speed

1975 Maico 400MX

1.99

4 speed

1976 Maico MC440

1.99

4 speed

1992 Honda CR500 R

2.01

5 speed

88-92 same, 1987 is 2.21

1986 Suzuki RM250 G

2.01

5 speed

1992 Honda CR500 R

2.01

5 speed

1998 Yamaha YZ400F

2.03

5 speed

4stroke

2002 Husqvarna Motocross CR250

2.03

5 speed

4-stroke

2001 Suzuki RM250

2.04

5 speed

1982 420 AXC/AE Automatic

2.05

4 speed

auto

1992 Honda CR250

2.07

5 speed

red tank white frame, same as 98

1998 Honda CR125

2.09

5 speed

1975 Yamaha YZ360

2.09

5 speed

yellow steel tank with strap

2002 KTM SX300

2.11

5 speed

1988 Kawasaki KX250 F1

2.13

5 speed

1976 Yamaha YZ250 C

2.14

5 speed

2001 RM125

2.18

6 speed

1994 Honda CR500 R

2.21

5 speed

diffo 4th and 5th than 92 version

1986 Yamaha YZ250 S

2.24

5 speed

red w/white tank

1978 Honda CR250 R

2.27

5 speed

all red, kick start on left, twin shock

1976 Suzuki RM250 B

2.27

5 speed

1976 Suzuki RM250 MX

2.27

5 speed

1975 Husqvarna WR460

2.31

5 speed

twin girling shocks, points

1976 Kawasaki KX250

2.33

5 speed

1988 Kawasaki KX125 F1

2.33

6 speed

1976 Suzuki RM100 MX

2.35

5 speed

also 76 rm125

2002 Husqvarna Motocross CR125

2.36

6 speed

2002 Husqvarna Enduro WR125

2.36

6 speed

2-stroke

1976 Penton 125MC5 MX

2.37

5 speed

KTM motor

1973 Honda CR250

2.39

5 speed

#1 silver tank first-CR ALSO 76

1987 Yamaha YZ125

2.42

6 speed

white w/red seat

1976 Honda CR125

2.42

6 speed

M2 all red

1986 Kawasaki KX125 E1

2.42

6 speed

1977 Yamaha YZ250 D

2.42

5 speed

1975 Yamaha YZC125 MX

2.43

6 speed

first monoshock mx bike

2002 KTM 300EXC

2.47

5 speed

wide ratio

2000 KTM 380EXC

2.47

5 speed

1990 Kawasaki KX500

2.50

5 speed

1988 Kawasaki KX500 D1

2.52

5 speed

1986 Kawasaki KX500 B2

2.53

5 speed

1980 Kawasaki KX420 A1

2.53

5 speed

1976 Honda CB750

2.58

5 speed

1970 Honda SL350

2.61

5 speed

1969 CL350 crummy-too-tight-tranny

1992 Suzuki RMX250

2.65

5-speed

2000 Suzuki DRZ400 -E

2.65

5 speed

19.8 overall in first

1969 Honda SL90

2.66

4 speed

2002 Husqvarna WR360

2.68

6 speed

2 stroke

1968-9 Yamaha DT1 A B

2.70

5 speed

1970 DT1 is the red tanker

1972 Honda CB100

2.71

5 speed

1977 Yamaha YZ400 D

2.73

5 speed

close-ratio

1977 Yamaha IT250 D

2.73

5 speed

1968 Honda CT50

2.75

3 speed

C70

1970 Honda CB100

2.77

5 speed

1971 Maico 501

2.78

4 speed

1973 Honda CB100

2.77

5 speed

1965 Honda 50

2.80

3 speed

1998 Honda XR400

2.82

5 speed

1970 Yamaha 250 DT1 C-MX

2.84

5 speed

2000 KTM 520SX RACING

2.87

4 4

4-stroke

2000 KTM 400SX

2.87

4 Speed

"Close Ratio"

2000 Yamaha WR400 FN

2.88

5 speed

1998 Yamaha WR400 F

2.88

5 speed

2000 Yamaha YZ426

2.88

5 speed

1974 Kawasaki KZ400 Street

2.89

5 speed

1973 Suzuki Savage 250

2.92

5 speed

1972 Honda XL250

2.92

5 speed

silver tanker firstXL250

1973 Suzuki Savage 250

2.92

5 speed

ALSO 1971

1996 Suzuki DRS650

2.92

5 speed

1978 Kawasaki KZ 200 -A1 Street

2.93

5 speed

1976 Honda XL250

2.94

5 speed

box-tank

1983 Yamaha TT600

2.97

5 speed

1970 Ossa 250 Pioneer

3.01

4 speed

enduro w/lites

2000 KTM 520EXC

3.01

6 speed

2000 KTM 400EXC RACING

3.01

6 speed

1977 Yamaha XT500 D

3.03

5 speed

2000 KTM 200EXC

3.03

6 speed

2000 KTM 640LC4 S/XC

3.06

5 speed

4-stroke

2000 KTM 400LC4

3.06

5 speed

4-stroke

2000 KTM 640LC4

3.06

5 speed

2000 KTM 640LC4 ADVENTURE R

3.06

5 speed

2000 KTM 640LC4 Super Moto

3.06

5 speed

epa approved

1997 KTM Duke

3.06

5 speed

2001 Kawasaki KDX220

3.09

6 speed

2002 Husqvarna Enduro WRE125

3.10

6 speed

2-stroke street-legal

2000 Husqvarna SM 125 S

3.10

6 speed

enduro in europe 2 stroke street-legal

1973 Honda CB125

3.13

5 speed

1984 Yamaha IT200

3.14

5 speed

1971 Yamaha RD350R5

3.18

5 speed

(street bike twin)

1984 Kawasaki KDX200 -A2

3.18

6 speed

1977 Yamaha DT400 D

3.22

5 speed

1978 Suzuki DR370

3.22

5 speed

silver metal tanker 4-stroke

1972 Zundapp 125 Enduro

3.24

5 speed

1986 Yamaha TT350

3.25

6 6!

4-strokes

1999 KTM Adventure R 640

3.27

5 speed

1976 Yamaha DT400 D

3.28

5 speed

1973 Yamaha DT3 250

3.29

5 speed

1977 Yamaha IT400 D

3.30

5 speed

1977 Yamaha DT250 D

3.30

5 speed

1976 Yamaha IT400 C

3.30

5 speed

blue tanker

1970 Yamaha 250 DT1 C

3.31

5 speed

1970 Yamaha 360 RTI

3.31

5 speed

1976 Honda XL350-76

3.33

5 speed

1986 Honda XR250

3.40

6 speed

red plastic tank, white frame

1975 Penton 250 Enduro

3.43

6 speed

has KTM motor

1970 Honda SL100

3.43

5 speed

first year

1974 Honda XL125

3.43

5 speed

first year

1976 Bultaco Alpina 350

3.47

5 speed

1975 Husky WR250

3.47

6 speed

1998 Honda XLR250

3.40

6 speed

1970 Hodaka Super Rat

3.42

5 speed

1970 Honda SL100

3.43

5 speed

first year, 1971=2.69

1972 Suzuki 185 Enduro

3.44

5 speed

1973 Suzuki 125 Duster

3.44

5 speed

1970 Kawasaki 350F5 Bighorn

3.45

5 speed

1971 Kawasaki F8 250e enduro

3.45

5 speed

1979 Kawasaki KD 175-A4 enduro

3.47

5 speed

1986 KTM MXC 250

3.47

5 speed

1968 Hodaka Ace 100

3.50

5 speed

ALSO 1970B

1976 Honda MR250

3.51

5 speed

enduro with lites same as MT250?

1973 Bultaco 250 Matador

3.52

5 speed

"Six Days" 250

1994 Honda XR250 L

3.52

6 speed

4 stroke white with red seat- aka XLR 250

2002 Husqvarna Enduro TE570

3.53

6 speed

Single cylinder, four stroke

1978 Suzuki PE175

3.53

6 speed

yr 1

1978 Honda XL185

3.56

5 speed

1973 Ossa 6-Days 250

3.60

5 speed

1977 Yamaha IT175

3.68

6 speed

first year, 78 same

1976 Hodaka Thunderdog 250

3.70

5 speed

Enduro w/lites

1973 Kawasaki 125 F6

3.7

5 speed

also 71 and 72

1977 Sachs 125

3.71

5 speed

Penton 125 had same motor

1970 Honda CB175

3.71

5 speed

1986 Can-Am ASE 350

3.72

6 speed

1975 Suzuki RL250 trials

3.78

5 Trials

1973 Honda TL125 trials

3.82

5 speed

1977 Harley Sportster 1000

3.97

4 speed

1973 Yamaha 125 AT1

3.98

5 speed

ALSO 1976

1972 Yamaha CT2 175

3.98

5 speed

1975 Yamaha 175 trials

4.01

6 speed

1974 Yamaha TY250 Trials

4.14

5 speed

1970 Honda Trail 90 CT90

4.95

4 speed

(2.65 w/o overdrive)

1970 Kawasaki G4TR 100 "Trail Boss"

5.16

5 speed

(3.04) dual range tranny

WHAT DOES IT MEAN?

In first gear the motor is turning 2 to 4  times faster that it does in fifth.

If a 1998 CR250 (2.07) and a 2000 KTM 200 EXC(3.03) were both geared down so that their first gears were the same overall ratio, at the same RPM:

- The CR could do 45 mph in fifth gear
- The KTM200 could do 45*(3.033/2.07)= 66 mph in fifth gear
- A Honda XR250L (3.52) could ddo 77 mph in fifth gear  at the same rpm!
45*(3.52/2.07) = 77.

 

Note some ironies. For example, the 2000 KTM 400EXC 6 speed transmission is closer spaced than the 2000 KTM 400 LC4 5-speed !

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