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

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11 MI-1062
a weak spark or no spark at all, follow instructions in
“ Breaker Point Adjustment” paragraphs. Also check
ignition wires, spark plugs, condenser and coil.
MAGNETO IGNITION
MAGNETO
The flywheel magneto used on this model of engine is
a product of either the Fairbanks-Morse or Wico
Electric companies. The magneto is made up of three
component parts; flywheel, stator plate with coil, and
breaker assembly.
The breaker box is an integral part of the crankcase,
and the points and condenser contained there-in are
used for either Wico or Fairbanks-Morse magnetos.
The other components; flywheel and stator plate , must
be of the same manufacturer when service replacement
becomes necessary. In other words do not use a Wico
flywheel with a Fairbanks-Norse stator plate or vice
versa. The manufacturers name is cast on these parts
for identification.
If
oil , leaks from breaker box, refer to “Crankcase
Breather” cleaning for cleaning of breather valve seat.
BATTERY IGNITION
IGNTION COIL – 12 Volt
Engines furnished with battery ignition, instead of the
standard magneto ignition system, uses a conventional
12 volt ignition coil. The same breaker point assem-
bly is used for both types of ignition, but the flywheel
and fan end bearing plate differ.
The following “Breaker Point Adjustment” and “Tim-
ing” procedures apply to both magneto and battery
ignition systems.
BREAKER POINT ADJUSTMENT
The breaker points are contained in the breaker box
on the left hand side of the engine. The points are
actuated by a push pin operating off the camshaft.
The hardened steel head of the push pin contacts the
breaker cam on the camshaft, as illustrated in Fig. 10.
At least twice each season or when ignition spark
becomes weak, remove breaker box cover, inspect the
points and check the gap opening. If there is evidence
of pitting or pyramiding and it becomes necessary to
resurface or replace point, it will also be necessary
to readjust the gap to its proper clearance, and re-
time the engine.
The normal breaker point gap is 0.020 inch at full
separation. However; the fixed running spark advance
of 18° is regulated by the point opening, and thus a
slight variation in gap opening may occur when ob-
taining an accurate spark advance.
With reference to
Fig’s. 10 and 11 , adjust breaker
point gap as follows, and then proceed as per instruct-
tions in Timing paragraphs.
1. Turn engine over by means of the starter sheave
until breaker arm push pin is at the highest point of
the cam (maximum point opening).
2. Loosen contact support plate lockscrew just enough
so that plate can be moved.
3. Place a 0.020 inch feeler gauge between points.
4 Insert a screw driver into adjusting slot (earlier
model engines had an adjustment cam) and open or
close the contacts, by moving the plate, until
proper point gap is obtained.
5. Tighten lockscrew and recheck breaker point gap.
TIMING
MAGNETO or BATTERY IGNITION
The fixed running spark advance of 18
°
is regulated by
the breaker point opening and reasonably accurate
timing is obtained by simply setting the breaker point
gap to 0.020 inch , as explained in “Breaker Point
Adjustment” . However, static timing with a continuity
light, as illustrated in Fig. 12 , is more accurate and
advisable. The timing light is Wisconsin Motor part
number DF-81-S1 .
The accuracy of the timing can be checked with a
neon lamp and the engine running at operating speed.
It is however, not advisable to adjust the timing while
engine is running. See “Static Timing Procedure” .
A timing pointer is located on the right hand side of
the flywheel shroud, to indicate the correct place-
ment of the flywheel advance timing mark .
STATIC TIMING PROCEDURE: See Fig. 12.
1. Disconnect coil primary wire at bottom of breaker
box. Remove breaker box cover.
2. Grooved timing mark on flywheel can be observed
thru the opening on right hand side of flywheel
shroud.