1985 YTZ250 N Specifications

General Specs
ManufacturerYamaha
Year1985
ModelYTZ250 N
Model NameTri-Z
Model Code38W
Frame VIN LocationStamped into right side of frame neck
Engine Serial LocationStamped on top of right crankcase cover
Frame Starting NumberJY338W00*FC000101
Engine Starting Number38W-0000101
Chassis
Length1920 mm (75.6 in)
Width1090 mm (42.9 in)
Height1060 mm (41.7 in)
Seat Height750 mm (29.5 in)
Wheelbase1325 mm (52.2 in)
Ground Clearance245 mm (9.6 in)
Curb Weight143 kg (315.3 lb)
Caster Angle22.5°
Trail35 mm (1.38 in)
Tire & Rim
Front Tire Size25x8-12
Rear Tire Size22x11-8
Front Rim Size6.5x12 in
Rear Rim Size8.25x8 in
Engine
Engine TypeSingle cylinder 2 stroke liquid cooled
Cylinder ArrangementSingle cylinder forward inclined
Displacement246 cc (15 ci)
Bore68 mm (2.7 in)
Stroke68 mm (2.7 in)
Compression Ratio7.7:1
Starter TypeKick
Fuel TypePremix premium 90 octane or higher
Oil Capacity - Total1.05 L (1.1 US qt; 0.9 Imp qt)
Oil Capacity - Oil Change1 L (1.1 US qt; 0.9 Imp qt)
Drive Train & Transmission
Clutch TypeManual - wet multi-disk
Transmission Type5 speed constant mesh
Primary Reduction2.625
First Gear2.384
Second Gear1.750
Third Gear1.411
Fourth Gear1.142
Fifth Gear0.956
Final Reduction3.384
DrivelineO-ring chain
Drive Chain (Size/Links)520/98
Carburetor
BrandMikuni
Identification Mark38W00 (VM32SS)
Main Jet#470
Pilot Jet/Slow Jet#45
Pilot Screw Adjustment1 Turn out
Float Level31.3 mm (1.2 in)
Engine Idle1500 RPM
Air Filter TypeOiled Foam
Fuel Tank Capacity10 L (2.6 US gal; 2.2 Imp gal)
Ignition
Ignition TypeCDI
CDI Identification MarkF8T07072 (Mitsubishi)
Spark PlugB8ES (NGK)
Spark Plug Gap Max0.7-0.8 mm (0.028-0.031 in)
Pulse Generator9.6-11.8 Ω
Exciter Coil284-347 Ω
Lighting Coil0.52-0.64 Ω
Ignition Coil Primary0.67-0.91 Ω
Ignition Coil Secondary w/o Cap5000-6800 Ω
Initial Ignition Timing4.0° BTDC
Full Advance Ignition Timing16.0° BTDC
Ignition Advancement TypeElectronic
Electrical
Voltage12 V
Power TypeAC Single Phase
Regulator Voltage13.5-14.1 V
Brakes
Front Brake OperationRight hand
Rear Brake OperationRight foot
Front Brake TypeHydraulic disc
Rear Brake TypeHydraulic disc
Suspension
Front SuspensionTelescopic Fork
Rear SuspensionSwingarm
Front Wheel Travel230 mm (9.1 in)
Rear Wheel Travel220 mm (8.7 in)
Front Fork Oil Capacity334 cc (11.3 US fl oz; 11.8 Imp fl oz)

Information on this page is provided in good faith that it is accurate, but in no way is the data guanteed to be accurate. If there are any mistakes, please contact me.