numptydog Posted March 26, 2017 Share Posted March 26, 2017 Folks See pic, 2MG cylinder head, the hole circled in red pen. What is this for? Any idea? A tell tale? There is one each side. I have a very, very, very, slight coolant leak out of one of the holes only, clutch side of engine. Machine does not run hot at all. Fine on a long run. It is not chucking coolant out of there, but leaking never the less. Just want to know what is up this hole! Doubt it should be leaking from there anyway. Is it an indication of a head gasket going?. BR, Julian Link to comment Share on other sites More sharing options...
Keith Inglis Posted March 26, 2017 Share Posted March 26, 2017 Well I do not know for sure but is it a plug to protect the block if it gets frozen a bit like a core plug ? is it a soft plug or a hard one ? mayby you can replace it with a new one, have a look on the parts list and see if it is listed as water is coming out it is in the waterway and not the compression chamber. Keith Link to comment Share on other sites More sharing options...
numptydog Posted March 28, 2017 Author Share Posted March 28, 2017 Thanks Keith Just can't find it on parts list if it is a plug for protection against freezing, although that could make sense. Someone else thinks it may be a vent hole from the spark plug area - so any water falling down where the plugs are can drain out. That makes sense as well. Will know for sure this weekend. Going to collect a few spare engines for the bike and some other bits. One of the engines already stripped down. Will soon be able to check a head to see what it is actually for. Thanks Julian Link to comment Share on other sites More sharing options...
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