Has your Spring Sprung?

  The importance of breaker point spring tension should never be overlooked. It should be considered equally important as the gap.
A breaker point with too little tension will bounce and cause ignition advance to vary and thus cause premature power head failure. A breaker point with too much tension Will cause premature point follower wear which leads to poor performance.
The method of checking tension is as follows:
1. Expose breaker point as outlined in appropriate service manual.
2. Connect one lead of test light  to breaker point terminal screw and the remaining lead to a good ground.

NOTE: Breaker points being checked must be in closed position.

3. Switch test light to "ON" position.
4. Position tension indicator lever at center of area where breaker points make contact.
Note: Any spring loaded weight measuring device can be used,  (such as a fish scale) but care should be exercised concerning it's accuracy.

5. With lever of tension indicator, force breaker points to open. When points open, test light will go out. Check ounce reading on indicator when this occurs and repeat test. Second reading should repeat within (2) ounces of first reading. If not, repeat until readings are consistent.
6. Readings should be within range specified for the particular point being checked as shown on the chart which follows.
(These numbers are supplied as reference only, check your engine manual for exact specification.)

H.P.                            Breaker Point Spring Tension (In Ounces)
(2 cycle motors)
3.6                              14-28
4                                 16-32
4.45                            16-32
6-9.2                          16-32
9.9-15                        16-32
20-35                         16-32
35-55                         30-40 (Magneto)
35-55                         24-32 (Battery or Battery C-D)
70-150                       25-30

(4 cycle motors, All horsepower's)

Several model Distributors could be used for any one model year engine so verifying distributor type is the first step. There usually isn't much difference in spring pressure, from manufacturer to manufacturer, but look for a published specification in your owners manual.
The average specification is 20-30 inch pounds.

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