Sulky Siegfried

Good news and bad news I suppose. Lined up the dynamo timing correctly and tightened up with M7 left hand bolt. Despite bike in gear and cylinder head on the bolt still did not feel right. Anyway. Good news. Bike fired up 1st kick and revved properly instead of the usual sluggish response. Bad news. Motor coughed and died. Inspection of the dynamo showed the bolt had not held and the timing had slipped. Upshot is that I now know that it was the timing being out caused the problem all along. Solution. Well attempts to enlarge the M7 bore thread to M8 have literally ground to a halt. It just won't go. Searches everywhere for a left hand M7 tap have been fruitless. So I have decided to go for it with an M7 right hand tap + new MZ matching thread and length bolt + helicoil insert +lock bolt in with 33 NM breakaway Loctite 270. All is on order so let's see what happens next. Great news is that loads of little jobs also got done. Now it comes down to final cosmetics tidy up.