Robin EY28 PARTS LIST

PARTS
MANUAL

Model

EY28
ENGINE

PUB-EP5736A
Rev . 02/00

940 Lively Blvd.  Wood Dale, IL 60191  Phone: [phone]  Fax: [phone]

e-mail: [e-mail] • www.robinamerica.com

© Copyright 2000 Robin America, Inc.

HOW TO USE THIS MANUAL

Robin engines are identified by MODEL, SPECIFICATION, and CODE NUMBER. For each
model there may be many different versions called specifications. Each specification will be
unique in some way. The difference may only be the paint color or it may have a different
type of PTO or some other significant difference.

In order the identify the correct service part number, it is important to confirm the specifica­tion and code numbers for your engine. The specification and code number together are
know as the PRODUCT NUMBER.

All Robin 4 cycle engines have a Product Number label similar to the label illustrated below.

PRODUCT NUMBER LABEL

PRODUCT NUMBER LABEL LOCATIONS

The Product Number Label has a 15 digit alphanumeric string that consists of the
SPECIFICATION (SPEC) number (11 digits) and the CODE number (4 digits). Please
note the illustration below:

E Y 2 8 0

SPEC NO. (11 digits) CODE NO. (4 digits)

PRODUCT NO. (15 digits)

EY28 - 3 - '00-02

X X X X

MANUAL LAYOUT

1. SECTION NAME Parts are broadly classified according to their functions.

Refer to the Group Index (table of contents) for respective section name.

2. FIG. No. The FIG. number indexes the reference and part numbers to the illustration. Figure numbers
that vary only in the tens place (i.e..: 700 and 710) are in a group of the same section
(i.e..:Electrical Device Group).

3. REF. No . The Reference number identifies the part illustration with the corresponding part number in the
part list.

4. SUBASSEMBLY SUBASSEMBLY parts of part assembly are listed below the assembly part. The subassembly
part reference number is indicated by the number led by "-" such as "-1", "-2".

5. PART NUMBER It is the number assigned for sales unit. Use the PART No. when making an order.

6. DESCRIPTION It is designation of the part.

7. QTY. Quantity of each part used for each product.

8. REMARKS This gives a distinctive feature and/or a supplementary comment for the type, the specification,

and the part concerned. It also shows part number(s) interchangeable for the part.

9. FROM-TO This section shows the CODE No. to indicate the history of progress in which improved parts
have been introduced in the product. The FROM-TO CODE No. helps to identify PART No.
being employed in the product concerned. See the examples below:

- The part is used in the product irrespective of CODE No.
2101- The part is used in the products with CODE No. of 2101 and after this number.

- 2100 The part is used in the products with CODE No. of 2100 and before this number.

EY28 - 4 - '00-02

GROUP INDEX

Group Name Page

CRANKCASE GROUP ............................................................................... 6

CRANKSHAFT GROUP ............................................................................. 8

INTAKE and EXHAUST GROUP .............................................................. 10

GOVERNOR GROUP ............................................................................... 12

COOLING and ST ARTING GROUP ........................................................... 18

FUEL GROUP ........................................................................................... 24

FUEL GROUP - CARBURETOR ............................................................... 26

ELECTRIC DEVICE GROUP - RECOIL ST ART........................................ 28

ELECTRIC DEVICE GROUP - ELECTRIC STAR T................................... 30

ELECTRIC DEVICE GROUP - ST ARTING MOTOR.................................. 32

ELECTRIC DEVICE GROUP - OIL SENSOR............................................ 34

INDEX OF DESCRIPTION SYMBOLS

SYMBOL DESCRIPTION

AY .......................... ASSEMBLY

CP ..........................COMPLETE

EX .......................... EXPORT (from Japan)

FIG......................... FIGURE

FR. ......................... FRONT

".............................. INCH

INCL....................... INCLUDE

~L ........................... LITER

L= ........................... LENGTH (in. mm)

L.H. (LH) ................ LEFT-HAND SIDE

MECH .................... MECHANICAL

NO (NON) .............. NONE

OPT. ....................... OPTIONAL

O.S......................... OVER SIZE

SYMBOL DESCRIPTION

P= .......................... PITCH (in mm)

P.T.O. (PTO) .......... POWER TAKE OFF

REF. .......................REFERENCE

R.H. (RH) ............... RIGHT HAND SIDE

RR. ......................... REAR

STD........................STANDARD

SW ......................... SWITCH

T=........................... THICKNESS (in mm)

UN .......................... UNIT

U.S. ........................ UNDER SIZE

~V .......................... VOLTAGE

~W ......................... WATT

W/ .......................... WITH

W/O ........................ WITHOUT

EY28 - 5 - ''00-02

SECTION 1 CRANKCASE GROUP

FIG. 100

EY28 - 6 - '00-02

SECTION 1 CRANKCASE GROUP

REF. P ART NO. DESCRIPTION QTY. REMARKS FROM-TO FIG.

10 234-10101-31 CRANKCASE, compl. 1 Recoil start type 100

234-10102-31 CRANKCASE, compl. 1 Electric start type 100
20 227-14202-03 VALVE GUIDE 2 Oversize 100
30 044-03000-30 OIL SEAL 1 100
40 060-03002-20 BALL BEARING 1 100
50 031-00600-20 DOWEL PIN 2 100
60 010-50802-90 STUD, muffler 2 100
70 010-50601-91 STUD, carburetor 2 100
80 040-11400-30 PLUG 2 100
90 021-11400-20 GASKET 2 100

210 234-12001-01 MAIN BEARING COVER, cp 1 SAE 100

234-11001-01 MAIN BEARING COVER, cp 1 Metric 100

220 044-03000-30 OIL SEAL 1 100
230 060-03002-20 BALL BEARING 1 100
250 234-45001-01 GOVERNOR GEAR, compl. 1 100
260 205-41901-03 GOVERNOR SLEEVE 1 100
270 227-63601-03 OIL GAUGE 2 100

227-63601-03 OIL GAUGE 1 Oil Sensor type 100

280 021-31600-20 GASKET 2 100

021-31600-20 GASKET 1 Oil Sensor type 100

290 234-16001-03 GASKET, bearing cover 1 100
300 001-14082-80 BO LT and WASHER AY 8 100
610 234-13001-23 CYLINDER HEAD, compl. 1 100
620 234-15001-01 GASKET, head 1 100
630 011-00800-10 FLANGE BOLT 8 100
810 234-14301-01 TAPPET COVER, compl. 1 100
820 234-14401-01 BREA THER PLA TE, compl. 1 100
830 234-16006-03 GASKET , tappet cover 1 100
840 234-16007-03 GASKET , breather plate 1 100
850 085-10800-00 RUBBER PIPE 1 Ø 8mm X Ø 11m m 100
860 011-00600-20 FLANGE BOLT 2 100

*960 234-99001-07 GASKET SET 1 100

* Gasket set includes the following:

Fig. 100 items 280, 290, 620, 830 and 840
Fig. 300 items 340, 550 and 560
Fig. 310 item 510-2*

EY28 - 7 - '00-02

SECTION 2 CRANKSHAFT GROUP

FIG. 200

EY28 - 8 - '00-02

SECTION 2 CRANKSHAFT GROUP

REF. P ART NO. DESCRIPTION QTY. REMARKS FROM-TO FIG.

10 234-20901-1 1 CRANKSHAFT, compl. 1 SAE, 1 in keyed 200

234-21001-1 1 CRANKSHAFT, compl. 1 SAE, PUMP type 200

234-21201-1 1 CRANKSHAFT , compl. 1 SAE, T APER type 200

234-20201-1 1 CRANKSHAFT , compl. 1 25mm keyed 200

234-20301-1 1 CRANKSHAFT , compl. 1 Metric Pump 200

234-20701-1 1 CRANKSHAFT , compl. 1 Metric Taper 200
40 023-03001-70 SPACER, T=0.6 1 select one piece only 20 0

023-03001-80 SPACER, T=0.8 1 select one piece only 20 0

023-03001-90 SPACER, T=1.0 1 select one piece only 20 0
50 002-18180-00 NU T 1 200
60 003-20180-00 SPRING WASHER 1 200
70 032-30300-10 WOODRUFF KEY 1 200

310 234-22501-10 CONNECTING ROD AY 1 200
320 227-23001-13 CONNECTING ROD BOLT 2 200
330 234-23101-03 OIL SCRAPER 1 200
350 234-23301-03 PISTON PIN 1 200
360 234-23401-03 PISTON 1 STD 200

234-23402-03 PISTON 1 oversize 0.25mm 200

234-23403-03 PISTON 1 oversize 0.50mm 200

370 254-23501-07 PISTON RING SET 1 S TD 200

254-23502-07 PISTON RING SET 1 oversize 0.25mm 200

254-23503-07 PISTON RING SET 1 oversize 0.50mm 200

380 056-51600-10 CLIP 2 200

EY28 - 9 - '00-02

SECTION 3 INTAKE and EXHAUST GROUP

FIG. 300

COMPRESSION RELEASE TYPE

EY28 - 10 - '00-02

SECTION 3 INTAKE and EXHAUST GROUP

REF. P ART NO. DESCRIPTION QTY. REMARKS FROM-TO FIG.

10 234-32301-01 CAMSHAFT, compl. 1 Compression release type 30 0

234-31701-03 CAMSHAFT, compl. 1 300
20 234-32301-03 CAMSHAFT 1 Comperssion release type 300
35 232-36401-13 RELEASE LEVER 1 Compression release type From 4474 3 00

232-36401-03 RELEASE LEVER 1 Compression release type T o 4473 300
36 005-19041-00 SPRING PIN 1 Compression release type 300
37 003-15280-00 SNAP RING, OUTER 1 Compression release type 300
50 234-33301-03 TAPPET 2 300
60 227-33601-03 VLAVE SPRING 2 300
70 234-33401-03 SPRING RETAINER 2 300
80 234-33701-03 INTAKE VALVE 1 300
90 234-33501-03 EXHAUST VAL VE 1 300

310 234-30101-01 MUFFLER, compl. 1 300
320 234-34201-01 MUFFLER COVER, compl. 1 300
330 234-35301-01 MUFFLER BRACKET , compl. 1 300
340 234-35201-01 GASKET , exhaust 1 300
350 002-19080-00 NUT 2 300
360 011-00600-10 FLANGE BOLT 4 300
370 011-00600-10 FLANGE BOLT 1 300
375 011-00600-20 FLANGE BOLT 1 300
540 234-32901-03 INSULAT O R 1 300
550 234-35901-03 GASKET, insulator 1 300
560 234-35902-03 GASKET 2, insulator 1 300

EY28 - 11 - '00-02

SECTION 3 INTAKE and EXHAUST GROUP

FIG. 310

-3
650

600

590

610

A

B

C

-2

EY28 - 12 - '00-02