By
Stuart
I am giviing my Wheel Horse some long over due attention. It was stored after developing some spectacular somewhat frightening backfires. I have purchased a new carb and removed the head to clean away the heavy carbon deposites. Ground the valves and reset the the valve clearances. Prior to adding fuel , I performed a compression test which resulted in virtually no compression whatsoever, upon removing the head and inspecting the valves , I am mystified to why the exhaust valves opens a little on the compresion stroke ? Increasing the valve clearance to 0.050" prevents this occuring, raises the compression to 50 PSI, but the starter motor finds this dificult to cope (still not add fuel yet). I cannot work out why the cam should wear in this way ? So there must be another explanation but other than some sort of decompresion reason I can not think of one. Any guidence on this subject will be much appreciated, I am based in the UK and I am sure there are other owners of such machines but I do not know of any. ps. I am purchasing parts from the USA.
By Bttatro