Grinding ends of valve stems for lash/clearance when doing valves and seats was a known procedure for Tecumseh and Briggs small engines- also done on Harley side valve restorations, Ford Flat heads and some overhead valve engines like some jeeps and Continental tractor engines. The problem of minimal lash on many of the small engines sort of started for many in mid 1970s when unleaded gas became requirement and valve seat erosion became worse. BMW motorcycles /2,/5,/6 series designed for leaded gas had a rally demonstration display at Dells rally 1980s with examples of badly eroded valves. The 4000 mile adjustment schedule was reduced to 2000 miles and some people had filed end of valve stems to get proper clearance just to make it through end of riding season. Check for valve seat material- the old iron seats that were good for leaded gas need a harder seat now for unleaded- look for Stellite seats or something similar- couple other names out there indicating higher nickle and chrome content, might be called stainless steel seats. Ford N tractors supposed to have used Stellite seats some from factory, Onan might have a LP gas valve seat spec number available. RN
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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