Yamaha MX825V-EFI Manuale utente

TABLE OF CONTENTS

Model :MX825V-EFI

Feature Map………………………………………. 3

Specification..…………..……………………….. 4

Features & Structures.………………………. 5~17

FI Diagnostic Tool………………………………. 18

Wiring Schematic………………………………. 21

Equipment Information…………………….. 22

Oil Pressure Switch……………………………. 23

Valve Shim Adjustment Overview……… 24

Valve Adjustment Procedure…………….. 25

Fuel Pump Information……………………… 26

MX825 Owner’s Manual……………………. 27

FEATURE MAP

Model :MX825V-EFI

3 valves（IN x2, EX x1）

（high performance）

Oil filter Position

（easy to replace）

Debris screen

(reduces the amount of grass

clippings and other debris

entering the flywheel/cooling

fan area)

Fan case cover

(good maintainability)

75 degree V-bank angle

（compact engine）

30 degree phase shift

Crankshaft

（reduced vibration）

Yamaha muffler

（high performance,

low noise）

Fuel injection system

（good fuel efficiency &

performance, emission）

Shim type valve

clearance adjustment

（long maintenance interval）

Forced Lubrication system

（reduced engine wear）

Donaldson® cyclone-type air

cleaner

Specification

Model :MX825V-EFI

Model Name MX825V-EFI ECV 880 Vanguard 810 FX850V

Yamaha Kohler B&S Kawasaki

Dimensions* (in.) L x W x H 19.6 x 18.3 x 25.2 19.7 x 20.5 x 24 19.9 x 18.5 x 22.9 18.9 x 18.1 x 24.2

Weight –kg (lbs)60.0 (132.2) 61.7 (136) 41.3 (91) 47.6 (105)

Displacement –cc (ci) 824 (50.3) 824 (50.3) 810 (49.4) 852 (51.9)

Maximum Power

SAE J1995 (hp)

SAE J2723 33 - - 27

SAE J1940 -33 28 -

Measured

Maximum

Power

SAE J1995 (

hp)

SAE Certified Power 33.8 - - **

Measured by 3rd party -32.25 - -

Measured in house - - 28 -

Maximum Torque (ftlbs)50.1 51.1 -44.6

Bore –mm (in) 80 (3.15) 86 (3.39) 83.8 (3.30) 84.5 (3.33)

Stroke –mm (in) 82 (3.23) 71 (2.79) 73.4 (2.89) 76 (2.99)

Compression Ratio 9.1:1 8.9:1 8.4:1 8.2:1

Oil capacity (including filter)Not final na 2.1 qt.2.4 qt.

ENG configuration air cooled –vertical crankshaft

Lubrication full pressure with filter

499

464

639

*Competitor information from published public

data. Locations of measurements unclear.

Theme

Target

ContentPart

Performance for customer Service Tip

Model :MX825V-EFI

•Adopt 30 degree phase shift crank pins with internal oil passages

•Reduces vibration, and the number of parts required

•Balancer weight not needed to reduce vibration

Crankshaft

1) 30 degree phase shift design 2) Internal oil passageways

1) Reduce vibration 2) Increase reliability, reduce wear

30 degree Phase shift

#2 Crank Pin

#1 Crank Pin

Engine oil pumped from Crankcase

through the Crankshaft

Back to Oil Pan

To Con-rod Big end

•Compact engine design fits a wide variety of applications while allowing easy

access to maintenance components

•Good reliability and reduced engine wear

Theme

Target

ContentPart

Performance for customer Service Tip

Model :MX825V-EFI

•Thin 1st and 2nd piston rings reduce engine friction

•Short-skirt design piston also reduces friction

Piston/Piston Rings

Lightweight, short-skirt design piston, w/ thin Piston Rings

Less power is lost to friction, which means more power is available for work and

increased fuel economy.

Reduce internal engine friction

•The 1st ring can be installed either direction –the ‘R’

mark can be up or down

•The ‘RN’ mark on the 2nd ring, indicates upper side

‘R’ on 1st ring

‘RN’ on 2nd ring

The ‘RN’ mark shows upper side for 2nd ring

Thin piston rings

Short skirt

Theme

Target

ContentPart

Performance for customer Service Tip

Model :MX825V-EFI

•2 inlet Valves.

•Adopt shim valve adjustment design.

Valve system

1) Multi valve (2 IN, 1EX) , 2) Shim valve adjustment design.

•High performance

•Long maintenance interval

1) High performance, 2) Long maintenance interval.

•Valve clearance:IN 0.04～0.08mm

EX 0.08～0.12mm

•Periodical Check: 1,000 hr

•Shim increments: 0.05mm

2 Intake Valves

1Exhaust Valve Valve springs for intake are

different from that for exhaust

Shims for Valve clearance adjustment

(valve adjustment procedure outlined in the Service Tips section -Click

Theme

Target

ContentPart

Performance for customer Service Tip

Model :MX825V-EFI

•Fan case consists of 2pieces -Fan case and Fan case cover

•There are 2maintenance hatch under fan case cover

Fan Case Cover

Fan Case Cover consists of 2parts

•Good maintainability

Easy to remove grass clippings from cooling system

•Periodical Maintenance –minimum 200 hr

•Clean cooling fan area as needed using compressed air

•Clean oil cooler and any grass that may be trapped

on backside

Fan Cover Fan Case

Maintenance hatch to

remove grass clippings

Theme

Target

ContentPart

Performance for customer Service Tip

Model :MX825V-EFI

•Debris screen is installed to reduce the amount of grass clippings from

entering the flywheel/cooling fan area

Debris Screen

Adopt Debris Screen

•Good maintainability

To reduce grass clippings from clogging and easy maintenance

Debris screen

•Used compressed air to remove grass clippings and

other debris when cooling system is clogged.

•Periodical Maintenance

Clean cooling area: as needed –minimum 200 hr

Theme

Target

ContentPart

Performance for customer Service Tip

Model :MX825V-EFI

•Forced lubrication system with trochoid pump

•Trochoid pump with oil strainer and pressure relief valve

•Oil Cooler incorporated (air-cooled, radiator type)

Lubrication

Forced lubrication system

Good reliability and reduced engine wear.

Superior engine lubrication, reliability and reduced wear

Pressurized oil goes to

oil filter and oil cooler

through this hole.

To Oil filter &

Oil cooler

Oil is supplied to the

Crankshaft & Camshaft

after passing thru the oil

cooler.

Trochoid Oil Pump

Oil Strainer

Relief Valve

•Periodical maintenance

Change engine oil:100hr

Change oil filter :200hr

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