O.S. engine MAX-91SX-HRING C Spec PS VIPER, Owner'S Instruction Manual

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BASIC ENGINE PARTS

Heatsink Head

Carburetor

Typr 60M 

Crankshaft

Propeller nut

Crankcase

Thrust Washer

Glowplug

Beam Mount

Pump

As delivered, the carburetor is not fit to the engine. 

Secure it as follows.

INSTALLATION OF THE CARBURETOR

Retainer Nut

Carburetor Rubber

Gasket

0.2mm gap

Loosen the retainer nut, press the carburetor well 

down into the intake boss, compressing the rubber 

gasket as shown in the sketch, before re-tightening 

Nut.

Rotate the retainer nut gently until it stops, then 

tighten a further 90-120 degrees. Do not over-

tighten the screw as this will damage the carburetor 

body.

1.

2.

Pump Holder

60M One-way Valve

Return Screw

Cover Plate

Press down until the gasket becomes almost invisible.

Because of initial tightness, a standard 

electric  starter  may  have  difficulty  in 

rotating the engine when cold, before it 

has  been  adequately  run-in.  In  this 

case, use a high-torque type starter. 

DO  NOT,  however,  confuse  tightness 

with  the  symptoms  of  hydraulic  lock 

caused by an excess of fuel within the 

cylinder  -  often  the  result  of  over-

priming.

Attempting to force the engine to turn 

over  in  this  condition  may  cause 

internal  damage.  Instead,  remove  the 

glowplug,  invert  the  engine  and  eject 

surplus  fuel  from  the  combustion-

chamber.

Note:

FEATURES

As delivered, the carburetor is not fit to 

the engine.

Standard accessories

Glow Plugs No.8 (1 pc.), A5 (1 pc.)

Woodruff Key

Needle Adjusting Screw (M2.6x5  1pc.)

Silicone tube

Note:

Carburetor Complete 60M

T nipple

Instruction manual

(   2.5x   5.5xL300mm)

The MAX-91SX-H RING C-Spec PS VIPER is

installed with VIPER twin-plug head made

by OMI, USA instead of the original head.

Twin-plug haw power increase effect and

special head material develops extreme

cooling effect. Another difference from the 

standard version is it employs matched

new design low friction piston which offers

stable hovering as wellas powerfull flight.

Also, Return Needle Valve Holder which

makes the adjustement range wider, is

supplied as stantard.