Sachs SA 290 User Manual

TAKING DOWN THE ENGINE
Remove a ll connections fr om engi ne 10 f rame or unit (cables. electric connect ions etc.).
Un scr ew exhaust muffler, i. e. manifold a nd brocket.
Remove t he en gine and clean t horoughly before taki ng down.
When giving the engine a general overhaul, components should be removed in the
sequ
ence indicated.
Fig. 1
Fig. 2
6
Exhoust muffler, corburettor on d
el ec tric s tart er
Fi g. 1
Sc r ew dow n engine on Ihe as-
sembly jig with 2 he)(090n head
bolts M 10 )( 40, as shown in Ihe
adjoining ill ustration.
Re move intake silencer (I).
Un s cr ew adapte r flange cnd
lake off cover plate (21 or un-
screw intake si l encer (Fig. 302,
p.
53) with c over pl ale.
Pull o ff impul se pipe ( 4) .
Remove corbur ellor (3).
Rem ove insulating sleeves and
insula ting f lange.
If th ere is on intake stack be-
t we en cor burettor and cylinder,
r
emove it on ly if necessary.
Unscrew electric
starter.
Re coil s tart e r, st ar ter hub
and fa n
Fig. 2
Detach recoil sl arter .
Unlod;
nut in Ihe sl or l er hub (1).
Hold starler hub with retaining
l ever (2, r epai r too l no. 6), un-
screw the nut and r emove sta rter
h
ub with spring ring and washer.
Nol e:
In
the case of the Fairba n ks recoil starte r rel ease nu t, hold starter h ub with strap
span n er and unscrew nut.
I~ the case of the. recoil starter with friction iows rele<lse nut, hold sl orte r hub with
pin spanner (r epair tool no. 7) ond unscr ew il.
T oke off storle r hub with spring ring a nd washer.
Remove th~ cylindrical pin and .the beor i n!;! ro ll er fr om the magneto flywheel (Fair-
banks r eCOil starter) resp. 2 bearing rollers (recoil star t er with friction jaws).
Toke
off cove r disc (3).
Unsc rew fan and remove gasket.
Cover plat e and fan hou l ing
Fig. J
Un screw fixin~ clip (3) for igni-
tion lead (n ot In the case of 75 W
eq uipment) a nd cover (1).
Detach le ads a t termina ls 1, 2
a nd 3 of the term in al box {5} and
rem ove fan housing (4 ).
Note :
Rem
ove cov er fl anges on fan
housing f or electric sta rt er con-
nectian, if fitted.
T
ak e core of dowel tu bes.
Nole :
Remove
shor t-circuiting button
on ly if necessary.
Remove rub
be r cop (2) and
sho rt-circuiting builon.
D
eta ch short-circuiting lead fr om
insulator.
Remounl pa rts in reverse orde r.
Magnelo flywh ee l
Fig. 4
Fi t pro tective cop (reroir tool no.
4) to thr eaded end 0 crankshaft.
Fit retaining lever (1, repair tool
no.
6) 10 m agneto flywheel and
pull off the fl yw h ee l by m eans of
the extr acto r (2, repai r too l no.5).
Fig. ~
7

Sachs SA 290 Specifications

General

Brand	Sachs
Model	SA 290
Category	Engine
Language	English

Summary

Engine Disassembly and Component Service

Taking Down the Engine: Major Component Removal

Covers exhaust, starter, cover, fan, flywheel, crankcase, seals, bearings, bushing.

Recoil Starter Systems: Dismantling and Assembly

Details dismantling and assembly for Fairbanks, friction jaws, and pawls recoil starters.

Engine Assembly and System Setup

Engine Assembly: Crankcase, Ignition, and Starters

Covers crankcase, ignition, fan, starter, and flywheel assembly steps.

Carburettor Installation and Adjustment

Guide to installing and adjusting the carburettor for optimal performance.

Engine Operation, Maintenance, and Troubleshooting

Engine Test-Running, Running-In, and Laying-Up

Procedures for initial testing, break-in period, and engine storage.

Electric Starter Operation, Maintenance, and Faults

Instructions for using, maintaining, and troubleshooting electric starters.

Engine Faults and Troubleshooting Guide

Comprehensive list of engine faults and their likely causes.

Electrical Systems and Technical Specifications

Dynamo Magneto Wiring Diagrams

Electrical connection diagrams for various dynamo magneto systems.

Tightening Torques and Repair Dimensions

Specifications for bolt torques and critical component dimensions.