solve the problem of the timed breather is to block it of put new breather top exhaust i have one on the rear rocker cover as well with a flap valve on each you wood think that wood do it but no next you take the dynamo or alton generator clean with cellulose and casing all clean put dynamo back in with silicon on both services line up the sprocket on primary chain making shore with a rag to block off round chain so you do not drop nut washer in casing clamp dynamo take sprocket of then fill with mastic dow corning type smelly one this is done because you have moved the dynamo to line up the sprocket seal up outer cover done no more oil leaks the reason why there is a timed breather is i m shore you no that it is trying to get rid of excess air in the sump negative sump pressure if you dont block of all air going to engine it will leak round most oil seals you can by a flattened pipe called a ducks beak fitted on royal enfield by on ebay for about £3.00 not tried it my self it is the same as a flap valve my ones cost £5.00 hope this will help someone