Valve Spring Testing Information

The information in this bulletin is to be used as a guide in replacing intake and exhaust valve springs which have weakened or "taken a set" due to excessive heat and extended service in the engine. Valve springs which are too weak will not close properly at high speeds causing erratic engine operation, and probable damage to the valve, valve guide and seat.

The following table lists valve spring testing specifications for new valve springs applying to all Harley-Davidson 4-cycle engine models. To use the information listed when testing springs, a valve spring compression testing device is needed which will compress the spring the specified distance and at the same time measure the pounds compression. It is recommended that Harley-Davidson Valve Spring Tester and Torque Wrench, Part No. 96797-47, be used for this purpose.

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