Spark advance

[Purdy Swoft]

Again, I agree that retarded timing is the main cause of over heating . If momentum is kept up there will be much less problems when running at full advance . I feel that if the engine is in good condition , running at 50 MPH will greatly reduce the possibility of timing knocks and lugging . My model As easily cruise at 50 MPH and I have ran most of them that way for years .