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General Technical Data
Yamaha MX825V Engine Specifications
Engine Model ................ Yamaha MX825V-EFI
Engine Type ................ 4-cycle OHV V-twin cylinder air-cooled gasoline engine
Number of Cylinders ................ Two
Displacement, cu.in (cc) ................ 50.3 (824)
Cylinder Bore, in (mm) ................ 3.15 (80.0)
Piston Stroke, in (mm) ................ 3.23 (82.0)
Rated Engine Power, hp (kW) ................ 33.8 (25.2)
Rated Engine Speed, rpm ................ 3600
Maximum Torque, Nm (ft-lbs) ................ 67.9 (50.1)
Torque Speed, rpm ................ 3100
Compression Ratio ................ 9.1:1
Cylinder Liner ................ Cast iron
Valve Arrangement ................ Overhead valve
PTO Shaft Rotation ................ Counterclockwise (from PTO shaft side)
Lubrication System ................ Full pressure with filter
Cooling System ................ Forced air
Air Cleaner Type ................ Dual dry element
Oil Filter Type ................ Cartridge
Ignition System ................ ECU control battery ignition
Starting System ................ Electric starter
Fuel System
Fuel System Type ................ Carburetor
Carburetor Model ................ Delphi Multec EFI
Governor Type ................ Centrifugal, flyweight
Fuel Pump Type (Lo) ................ Mechanical
Fuel Pump Type (Hi) ................ Electrical
Fuel Type ................ Gasoline (86 or higher)
Fuel Line Pressure, psi (bar) ................ 37-41.5 (2.6-2.9)
Dimensions and Weight
Overall Length, in (mm) ................ 19.7 (499)
Overall Width, in (mm) ................ 18.2 (463)
Overall Height, in (mm) ................ 25.2 (639)
Dry Weight, lbs (kg) ................ 131.8 (60.0)
Yamaha MX825V Maintenance Data
Service Data
Cylinder Compression, psi (bar) ................ 190-210 (13.1-14.5)
Cylinder Bore Inside Diameter (Max), in (mm) ................ 3.1555 (80.150)
Cylinder Head (Max. Out of Flatness), in (mm) ................ 0.004 (0.10)
Intake Valve Clearance, in (mm) ................ 0.003-0.005 (0.07-0.13)
Exhaust Valve Clearance, in (mm) ................ 0.003-0.005 (0.07-0.13)
High Idle Speed (No load), rpm ................ 3550-3600
Low Idle Speed (No load), rpm ................ 1450-1550
Engine Oil and Filter
Engine Oil Type ................ Yamalube, SAE 10W, SAE 10W-30, 10W-40
API Service Classifications ................ SE, SF, or higher
Oil Capacity, qts (L) ................ 2.12 (2.0)
Air Filter Element Part Number ................ 7UD-E4461-00
Air Filter Inner Element Part Number ................ 7UD-E4451-00
Engine Oil Filter Part Number ................ 7UD-E3440-00
Fuel Filter Part Number ................ 7UD-F4502-00
Ignition System
Spark Plug Type ................ NGK BPR6ES
Spark Plug Gap, in (mm) ................ 0.028-0.032 (0.70-0.80)
Ignition Timing, degrees ................ 30 BTDC
Spark Plug Torque, Nm (ft-lbs) ................ 20 (14)
Service Intervals
Check Engine Oil Level ................ Every 10 hours
Service Air Filter Element ................ Every 50 hours
Clean and Adjust Spark Plug ................ Every 100 hours
Change Engine Oil ................ Every 100 hours
Check and Change Fuel Filter ................ Every 100 hours
Replace Engine Oil Filter ................ Every 200 hours
Clean Oil Cooler Fins ................ Every 200 hours
Check Fuel Line ................ Every 200 hours
Clean Fan Case Covers and Cooling Area ................ Every 200 hours
Replace Air Filter Element ................ Every 250 hours
Replace Spark Plug ................ Every 250 hours
Service Air Filter Inner Element ................ Every 250 hours
Replace Air Filter Inner Element ................ Every 500 hours
Check and Adjust Idle Speed ................ Every 1000 hours
Check and Adjust Valve Clearance ................ Every 1000 hours
Clean Combustion Chamber ................ Every 1000 hours
Yamaha MX825V Service Specifications
Cylinder Head And Valves
Cylinder Head Flatness, in (mm) ................ 0.002 (0.05)
Valve Head Diameter (Intake), in (mm) ................ 1.0984-1.1063 (27.9-28.1)
Valve Head Diameter (Exhaust), in (mm) ................ 1.3740-1.3819 (34.9-35.1)
Valve Stem Diameter (Intake), in (mm) ................ 0.2342-0.2348 (5.948-5.963)
Valve Stem Diameter (Exhaust), in (mm) ................ 0.2339-0.2344 (5.940-5.955)
Valve Stem Lenght (Intake), in (mm) ................ 3.4961 (88.8)
Valve Stem Length (Exhaust), in (mm) ................ 3.5354 (89.8)
Valve Seat Width, in (mm) ................ 0.0354-0.0433 (0.9-1.1)
Valve Guide Inside Diameter, in (mm) ................ 0.2362-0.2367 (6.000-6.012)
Valve Stem To Valve Guide Clearance (Intake), in (mm) ................ 0.0031 (0.08)
Valve Stem To Valve Guide Clearance (Exhaust), in (mm) ................ 0.004 (0.10)
Valve Spring Free Length (Intake), in (mm) ................ 1.4606 (37.1)
Valve Spring Free Length (Exhaust), in (mm) ................ 1.4016 (35.6)
Cylinder Block
Cylinder Inside Diameter, in (mm) ................ 3.1496-3.1504 (80.000-80.020)
Piston Skirt Diameter, in (mm) ................ 3.1480-3.1488 (79.959-79.980)
Piston Ring Groove Side Clearance (Top), in (mm) ................ 0.0016-0.0031 (0.04-0.08)
Piston Ring Groove Side Clearance (2nd), in (mm) ................ 0.0012-0.0028 (0.03-0.07)
Piston Pin Outside Diameter, in (mm) ................ 0.7478-0.7480 (18.995-19.000)
Clearance Between Piston And Cylinder, in (mm) ................ 0.0013-0.0019 (0.033-0.047)
Piston Ring End Gap (Top), in (mm) ................ 0.0079-0.0138 (0.20-0.35)
Piston Ring End Gap (2nd), in (mm) ................ 0.0079-0.0138 (0.20-0.35)
Piston Ring End Gap (Oil), in (mm) ................ 0.0079-0.0276 (0.20-0.70)
Connecting Rod Big End Inside Diameter, in (mm) ................ 1.5750-1.5756 (40.005-40.020)
Connecting Rod Small End Inside Diameter, in (mm) ................ 0.7483-0.7488 (19.006-19.020)
Crankpin Outside Diameter, in (mm) ................ 1.6122-1.6161 (40.950-41.050)
Crankshaft Big End Side Clearance, in (mm) ................ 0.0079-0.0256 (0.20-0.65)
Cam Height (Intake), in (mm) ................ 1.2947 (32.885)
Cam Height (Exhaust), in (mm) ................ 1.3369 (33.957)
Camshaft Journal Outside Diameter, in (mm) ................ 0.6679-0.6689 (16.965-16.990)
Tightening Torques
Cylinder Head Bolt (M10x1.25) ................ 50 Nm (36 lb-ft)
Cylinder Head Cover Bolt (M6x1.0) ................ 11 Nm (8.0 lb-ft)
Oil Drain Bolt (M12x1.5) ................ 27 Nm (20 lb-ft)
Air Filter Case Stay Bolt (M8x1.25) ................ 10 Nm (7.2 lb-ft)
Ignition Coil Bolt (M6x1.0) ................ 7 Nm (5.1 lb-ft)
Oil Cooler Bolt (M6x1.0) ................ 9 Nm (6.5 lb-ft)
Fan Case Bolt (M6x1.0) ................ 7 Nm (5.1 lb-ft)
Flywheel Nut (M22x1.5) ................ 180 Nm (130 lb-ft)
Crankshaft Position Sensor Bolt (M6x1.0) ................ 7 Nm (5.1 lb-ft)
Cylinder Air Shroud Bolt (M6x1.0) ................ 7 Nm (5.1 lb-ft)
Rocker Arm Shaft Bolt (M5x1.0) ................ 4.0 Nm (2.9 lb-ft)
Oil Pressure Switch (M4x0.7) ................ 8 Nm (5.8 lb-ft)
Oil Pump Cover Bolt (M6x1.0) ................ 10 Nm (7.2 lb-ft)
Relief Valve (M12x1.25) ................ 30 Nm (22 lb-ft)
Crankcase Cover Bolt (M8x1.25) ................ 30 Nm (22 lb-ft)
Connecting Rod Cap Bolt (M8x1.25) ................ 20 Nm (14 lb-ft)
- VIEW ALL MODELS
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KOHLER ENGINES SPECS AND SERVICE DATA |
CH12.5
CH14S
CH15S
CH16
CH18S
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CH23S
CH25S
CH640S
CH730S
CH750S
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CV15S
CV16S
CV18S
CV20S
CV22S
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CV23S
CV25S
CV490S
CV491S
CV730S
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CV740S
K161
K181
K241
K301
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K321
K341
K361
M18
M20
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SV470S
SV530S
SV540S
SV590S
SV600S
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SV710
SV715
SV725S
SV730S
SV735
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KAWASAKI ENGINES SPECS AND SERVICE DATA |
FA210
FA210D
FB460V
FC150V
FC290V
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FC420V
FC540V
FD501V
FD590V
FD620D
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FD731V
FD750D
FH430V
FH500V
FH531V
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FH580V
FH601V
FH680V
FS541V
FS600V
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FS651V
FX651V
FX691V
FX730V
FS541V
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FH541V
FH641V
FH661V
FH721V
FS730V
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BRIGGS AND STRATTON ENGINES SPECIFICATIONS |
252707
253707
282707
286707
303777
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28N707
28M707
28Q777
28R707
28S777
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311707
31A607
31C707
31N707
31Q777
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31R977
31R777
31P777
31P977
350777
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402707
422707
42A707
331777
331877
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HONDA ENGINES SPECS AND SERVICE DATA |
G50
G100
GC135
GC160
GC190
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GS190
GX100
GX120
GX160
GX200
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GXV120
GXV160
GXV270
GXV340
GXV390
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GXV610
GCV520
GCV530
GXV620
GXV630
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GCV145
GCV160
GCV170
GCV190
GCV200
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GSV190
GX110
GX140
GV100
GXV140
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