YAMAHA SNOW MOBILE
ET300E
SUPPLEMENTARY SERVICE MANUAL
LIT-12618-00-33
8L3-28197-10
FOREWORD
This supplementary service manual for ET300E has been published to supplement the ET300D supplementary service manual (8K0-28197-10). For complete information on service procedures, it is necessary to use this Supplementary Service Manual together with the following manuals: ET300C Service Manual (8H9-28197-10), ET300D Supplementary Service Manual (8K0-28197-10).
NOTE: The Research and Engineering Department of Yamaha are continually striving to further perfect all models. Improvements and modifications are therefore inevitable. In light of this fact, all specifications within this manual are subject to change without notice. Information regarding changes is forwarded to all Authorized Yamaha Dealers as soon as available.
SERVICE DEPT.
INTERNATIONAL DIVISION
YAMAHA CO., LTD.
Particularly important information is distinguished in this manual by the following notations:
NOTE: A NOTE provides key information to make procedures easier or clearer.
YAMAHA ET300E SUPPLEMENTARY SERVICE MANUAL
1st Edition, APRIL, 1980
ALL RIGHTS RESERVED BY YAMAHA MOTOR COMPANY, LTD., JAPAN
PRINTED IN JAPAN
LIT-12618-00-33
1. NEW SERVICE PROCEDURE
(New service procedure applied to the 1981 ET300E.)
A. Piston ring inspection
As a result of the recent change in the piston ring, item 10, page 2-8 of the ET300C service manual (8H9-28197-10) should be read as follows:
10. Piston ring inspection
- Check rings for scoring. If any severe scratches are noticed, replace ring set.
- Measure ring end gap in free position. If beyond tolerance, replace ring set.
- Push the ring into the bore and check end gap clearance with a feeler gauge. If beyond tolerance, replace ring set.
Ring end gap, installed
| Minimum | Maximum | |
|---|---|---|
| Top | 0.30 mm (0.012 in) | 0.50 mm (0.020 in) |
| Second | 0.30 mm (0.012 in) | 0.50 mm (0.020 in) |
Ring end gap, free
| Top | Approx. 6.5 mm (0.26 in) |
| Second | Approx. 7.5 mm (0.30 in) |
[Visual Description]: An image depicts a mechanic using a feeler gauge to measure the gap of a piston ring within a cylinder bore, illustrating the process of checking for proper fitment.
2. SPECIFICATIONS
General
NOTE: * New specification (Compared with 1980 ET300D)
| Model | ET300E | |
|---|---|---|
| Model (I.B.M. No.) | * ET300E (8L3) * 8L3-020101 * E294-020101 |
|
| Frame I.D. & starting number | ||
| Engine I.D. & starting number | ||
| Dimension: | ||
| Overall length | 2,385 mm (93.9 in) | |
| Overall width (std) | 935 mm (36.8 in) | |
| Overall height (w/windshield) | 965 mm (38.0 in) |
Engine
| Description: | ET300E | |
|---|---|---|
| Engine type | Fan cooled two-stroke 5-port, twin cylinders | |
| Engine model | E294 | |
| Displacement | 294 cc (17.94 cu.in) | |
| Bore X Stroke | 56 X 59.6 mm (2.21 X 2.35 in) | |
| Effective compression ratio | 6.5:1 | |
| Starting system | Recoil hand starter | |
| Ignition system | C.D.I. | |
| Lubrication system | "Autolube" oil injection | |
| Cylinder head: | ||
| Combustion chamber volume | 18.3 cc (1.12 cu.in) with spark plug | |
| Compression chamber type | Dome + Squish | |
| Head gasket thickness | 0.5 mm (0.02 in) | |
| Cylinder: | ||
| Material | Cast iron sleeves aluminum | |
| Bore size | 56 mm (2.21 in) | |
| Taper limit | 0.05 mm (0.0020 in) | |
| Out of round limit | 0.01 mm (0.0004 in) | |
| Piston: | ||
| Piston skirt clearance (Measuring point) | 0.040~0.045 mm (0.0016~0.0018 in) (10 mm from piston skirt end) | |
| Piston oversize | 1st 56.25 mm (2.213 in) 2nd 56.50 mm (2.224 in) 3rd 56.75 mm (2.234 in) 4th 57.00 mm (2.244 in) |
|
| Piston pin outside diameter X length | ∅16 X 47 mm (∅0.630 X 1.85 in) | |
| Piston ring: | ||
| Piston ring design (Top) | Keystone | |
| Piston ring design (2nd) | Plane | |
| Ring end gap (installed) (Top) | * 0.15~0.35 mm (0.006~0.014 in) | |
| Ring end gap (installed) (2nd) | 0.30~0.50 mm (0.012~0.020 in) | |
| * Ring groove side clearance (2nd) | 0.02~0.06 mm (0.0008~0.0024 in) | |
| Small end bearing: | ||
| Type | Needle bearing | |
| Big end bearing: | ||
| Type | Needle bearing |
2. SPECIFICATIONS (Continued)
Crankshaft
| Crankshaft assembly width (A) | 160 ± 0.1 mm (6.30 ± 0.004 in) | |
| Crankshaft assembly width (F) | 52 +0-0.05 mm (2.047 +0-0.002 in) | |
| Crankshaft deflection (D) | 0.03 mm (D-1) 0.04 mm (D-2) 0.04 mm (D-3) 0.03 mm (D-4) |
|
| Connecting rod big end side clearance (C) | 0.25~0.35 mm (0.010~0.014 in) | |
| Connecting rod small end deflection (P) | 2.0 mm (0.079 in) |
[Visual Description]: A schematic diagram of the crankshaft illustrates key measurement points and dimensions, including deflection points (D-1, D-2, D-3, D-4), assembly widths (A, F), connecting rod big end side clearance (C), and connecting rod small end deflection (P).
| Crank pin outside diameter X length | ∅22 X 51 mm (∅0.866 X 2.008 in) |
| Crank pin type | Solid shaft assembly type with serration |
| Crank bearing type (Left) X q'ty | #6306 special 1 pc. |
| Crank bearing type (Center) X q'ty | #6206 special X 2 pcs. |
| Crank bearing type (Right) X q'ty | #6305 special X 1 pc. |
| Crank oil seal type (Left) X q'ty | FPJ-30 72 8 2TS X 1 pc. |
| Crank oil seal type (Center) X q'ty | Labyrinth seal X 1 pc. |
| Crank oil seal type (Right) X q'ty | FPJ-25 48 8TS X 1 pc. |
Carburetor
| Type & manufacturer/quantity | B38-32 MIKUNI X 1 pc. | |
| I.D. Mark | 8H901 | |
| Main jet (M.J.) | #210 | |
| Pilot jet (P.J.) | #90 | |
| Pilot screw (P.S.) | 1-1/2 turns out | |
| Throttle valve (Th.V.) | #185 | |
| Valve seat (V.S.) | ∅1.5 mm (0.059 in) | |
| Float height | 25±1mm (0.98 ± 0.04 in) | |
| Idling engine speed | 1600 r/min |
Main jet setting chart
| Altitude | Temperature | |||||
|---|---|---|---|---|---|---|
| -30°C (-22°F) | -20°C (-4°F) | -10°C (14°F) | 0°C (32°F) | 10°C (50°F) | 20°C (68°F) | |
| Sea level | #220 | #210 (Std.) | #210 (Std.) | #200 | #200 | #190 |
| 600m (2000 ft) | #210 | #210 (Std.) | #200 | #200 | #190 | #180 |
| 1200m (4000 ft) | #200 | #200 | #190 | #190 | #180 | #180 |
| 1800m (6000 ft) | #200 | #190 | #190 | #180 | #180 | #180 |
| 2400m (8000 ft) | #200 | #190 | #190 | #180 | #180 | #180 |
| ~3000m (10000 ft) or more | #200 | #190 | #190 | #180 | #180 | #180 |
2. SPECIFICATIONS (Continued)
Lubrication
| Autolube pump - Color code | Blue | |
| Autolube pump - Minimum stroke | 0.20~0.25 mm (0.0079~0.0098 in) | |
| Autolube pump - Maximum stroke | 1.65~1.87 mm (0.0650~0.0736 in) | |
| Autolube pump - Reduction ratio | 1/36 | |
| Autolube pump - Output Min./200 strokes | 0.50~0.63 cc (0.0169~0.0213 oz) | |
| Autolube pump - Output Max./200 strokes | 4.15~4.70 cc (0.1403~0.1589 oz) | |
| Autolube pump wire free play | 25±1mm (0.98± 0.04 in) at idle | |
| Oil tank capacity | 2.4 liter (2.5 US. qt) | |
| Oil grade | YAMALUBE 2-cycle |
Drive and track suspension
Transmission
| Type | V-belt automatic centrifugal engagement | |
| Drive ratio | 3.5:1~1:1 | |
| Engagement rpm | * 3100~3300 r/min | |
| Primary spring: | ||
| Part No. | 90501-55345 | |
| Color code | Red-Red | |
| Secondary spring: | ||
| Part No. | 90508-40080 | |
| Color code | No. painted | |
| Secondary spring pre-load (twist) | 160° | |
| Sheave distance | 266±2mm (10.47 ± 0.08 in) | |
| Sheave off-set | 11±1 mm (0.43 ± 0.04 in) | |
| V-belt width and outer line length | 31.6 X 1,099 mm (1.24 X 43.3 in) | |
| V-belt wear limit | 26 mm (1.02 in) |
Track suspension
| Type | Slide rail suspension | |
| Damper type | Oil and gas damper | |
| Spring color code (Rear) | No. painted | |
| Slide runner wear limit | 10 mm (0.394 in) | |
| Track width | 380 mm (15 in) | |
| Track deflection | 25~30 mm/10kg (0.98~1.18 in/22 lb) | |
| Length on ground | 650 mm (25.6 in) | |
| Wheel sprocket material and number of teeth | Polyethylene 11T | |
| Stopper band length | 210 mm (8.27 in) |
Secondary drive
| Type | Chain (#40K-1) | |
| Reduction ratio | 22/13 (1.692) | |
| Chain pitch X Number of links | 12.7 mm (0.5 in) X 60L | |
| Free play | 10 +5-2 mm (0.4 +0.2-0.08 in) | |
| Chain housing oil quantity | 450 cc (15.2 oz) | |
| Chain housing oil grade | Gear oil API "GL3" (SAE #75 or 85) |
Brake
| Type | Disc brake | |
| Brake pad thickness | 7.3 mm (0.287 in) | |
| Brake pad wear limit | 1.0 mm (0.04 in) | |
| Gap between pad and disc | 0.2~1.0 mm (0.008~0.039 in) |
2. SPECIFICATIONS (Continued)
Chassis
| Frame: | ||
| Material | Aluminum + Steel | |
| Steering system: | ||
| Caster (ski column) | 25° | |
| Camber | 0° | |
| Ski length X width X thickness | 980 X 120 X 1.6 mm (38.6 X 4.7 X 0.06 in) | |
| Ski stance | 800 mm (31.5 in) | |
| Ski toe-out | 0~6 mm (0~0.23 in) | |
| Steering linkage type | Tie-rod | |
| Lock to lock angle (ski) | Right ski, L: 27.6° R: 24.8° Left ski, L: 24.8° R: 27.6° |
|
| Lock to lock angle (steering column) | Right: 54.3° Left: 56.3° |
|
| Front suspension: | ||
| Type | Leaf spring | |
| Damper type | Oil damper | |
| Fuel tank: | ||
| Capacity | 22.7 liter (6 US. gal) | |
| Fuel grade | Regular gasoline |
Electrical
Ignition system
| Type - flywheel magneto (C.D.I. type) | F3T352/MITSUBISHI | |
| Model/manufacturer | 12V | |
| Pulser coil resistance | 9.00 at 20°C (68°F) (White/Red-Black) | |
| Charging coil resistance | 350Ω at 20°C (68°F) (Brown-Black) | |
| Charging coil resistance | 15.0Ω at 20°C (68°F) (Blue-Black) | |
| Ignition timing: B.T.D.C. | 1.4 ± 0.1 mm (0.055 ± 0.004 in) |
Ignition coil
| Model: Manufacturer | CM62-20 HITACHI or * YW-51 TOYO DENSO | |
| Spark gap | 9 mm (0.4 in)/300 r/min | |
| Primary winding resistance | 11 mm (0.6 in)/3,000 r/min | |
| Secondary winding resistance | 0.15Ω at 20°C (68°F) * 0.12Ω at 20°C (68°F) | |
| Diode (Yes or No) | No |
Spark plug
| Type & quantity | NGK BR-9ES X 2 pcs. | |
| Spark plug gap | 0.7~0.8 mm (0.028~0.031 in) |
Spark plug cap
| Type | Rubber type with noise suppressor | |
| Noise suppressor resistance | 5kΩ at 20°C (68°F) |
C.D.I. unit
| Model/Manufacturer | 8H4-20/MITSUBISHI |
Lighting system
| Lighting output | 12V-100W | |
| Lighting coil resistance | 0.19Ω at 20°C (68°F) (Yellow-Black) | |
| Headlight type | Semi shield | |
| Bulb wattage/q'ty | 12V-60/60W X 1 pc. | |
| Tail/stop light wattage | 12-8W/23W |
A.C. regulator
| Model/manufacturer | TRIZ-24B/HITACHI or S8516B/TOSHIBA | |
| Voltage | 13.8 ± 0.5V |
