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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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