Yamaha YZ125 2009 User Manual

7-5
ENGINE
CARBURETOR SETTING PARTS
Part name Size Part number
Main jet
"1"
Rich #470 137-14143-94
#460 137-14143-92
#450 137-14143-90
#440 137-14143-88
**(STD) #430 137-14143-86
#420 137-14143-84
*(STD) #410 137-14143-82
Lean #400 137-14143-80
Pilot jet
"2"
Rich #50 4KM-14142-50
#47.5 4KM-14142-47
**(STD) #45 4KM-14142-45
#42.5 4KM-14142-42
*(STD) #40 4KM-14142-40
#37.5 4KM-14142-37
#35 4KM-14142-35
#32.5 4KM-14142-32
Lean #30 4KM-14142-30
Throttle
valve "3"
Rich
(STD) 4.0 1C3-14112-40
4.25 1C3-14112-42
Lean
Jet needle
"4"
Rich 6BFY44
-72
284-14116-K2
6BFY44
-73
284-14116-K3
6BFY44
-74
284-14116-K4
6BFY44
-75
284-14116-K5
Lean 6BFY44
-76
284-14116-K6
Rich 6BFY43
-72
284-14116-J2
6BFY43
-73
284-14116-J3
**(STD) 6BFY43
-74
284-14116-J4
6BFY43
-75
284-14116-J5
Lean 6BFY43
-76
284-14116-J6
Rich 6BFY42
-72
284-14116-H2
6BFY42
-73
284-14116-H3
*(STD) 6BFY42
-74
284-14116-H4
6BFY42
-75
284-14116-H5
Lean 6BFY42
-76
284-14116-H6
* For USA and CDN
** Except for USA and CDN
Part name Size Part number

Yamaha YZ125 2009 Specifications

General

Engine Type	124cc liquid-cooled 2-stroke; reed-valve inducted
Bore x Stroke	54.0mm x 54.5mm
Compression Ratio	8.6~10.7:1
Ignition	CDI
Final Drive	Chain
Front Brake	Hydraulic single disc brake, 250mm
Rear Brake	Hydraulic single disc brake, 245mm
Front Tire	80/100-21
Rear Tire	100/90-19
Overall Width	32.5 in
Wheelbase	58.3 in
Fuel Capacity	2.1 gal
Wet Weight	207 lb
Dry Weight	194 lb
Fuel Delivery	Mikuni® TMX 38
Front Suspension	Speed-sensitive inverted fork; fully adjustable, 11.8 in travel
Rear Suspension	Fully adjustable, 12.4-in travel