Wisconsin Air Cooled TR-10D, Instruction Book And Parts List

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MI-1075 24
against the spring and closes the throttle to a point
where the engine speed will be maintained practically
constant under varying load conditions. This speed
can be varied to suit conditions by adjusting the
governor spring tension. An idle return spring is
hooked into the upper end of the governor lever and
connected to the breather tube on the tappet cover.
GOVERNOR ADJUSTMENT (Fig’s. 44 and 45)
To maintain correct carburetor throttle opening and
obtain proper governor regulation, the governor lever
must be properly positioned on the fulcrum shaft.
This procedure is only necessary if governor lever
was loosened or removed from fulcrum shaft.
1. Assemble control rod, from carburetor throttle lever
to governor lever.
2. Connect governor spring, from adjusting screw to
hole in governor lever . This will hold carburetor
throttle wide open.
3. Loosen governor lever clamp screw so that fulcrum
shaft can be turned independently of governor lever.
4. Turn fulcrum shaft counter-clockwise until you feel
the internal governor vane stop against the flyweight
thrust pin.
5. Tighten clamp screw as illustrated in Fig. 44 , and
mount idle return spring from breather tube to gover-
nor lever as shown in Fig. 45 .
ENGINE SPEED (Fig. 45)
Engine speed is adjusted by hooking governor spring
into correct hole of governor lever, and then regulating
spring tension by means of an adjusting screw. The
governor lever has 8 holes for the governor spring,
with the No. 1 hole closest to the fulcrum shaft.
A change in the design of the governor flyweights was in-
corporated in TR-10D engines beginning with Serial
No. 3909152. Governor regulation is affected as a
result of this change, so in readjusting engine speed,
refer to Governor Lever Chart, Fig. 45 , for all TRA-10D
engines and if this change is pertinent to your TR-10D
engine.
TR-10D engines built previous to Serial No. 3909152
were set for full throttle operation:
Spring in Hole No. 2
No Load R.P.M. – 3800 Load R.P.M. – 3450
The governor lever chart, Fig. 45, shows the full load
and no load speeds and the corresponding governor
spring hole. After hooking spring into the lever hole
relative to the desired load speed , run the engine with-
out load and regulate the spring tension by means of
the
adjusting screw until the required no load speed is
obtained. The governor spring will have to be dis-
connected from adjusting screw each time screw is
turned in or out.
A tachometer or revolution counter should be used
against the crankshaft to check speed while adjusting
the governor spring tension. The engine speed with-
out load will be higher than the speed with load. For
instance, if the engine speed is to operate at 3000 R.P.M.
under full load, the speed with no load will be 3230
R.P.M. and this should be kept in mind when adjust-
ing the governor. Refer to the governor lever chart,
Fig. 45, for the variation between load speed and no
load (high idle) speed.