Drive chain tight, then slack

Here's the basics, trickest being speedo drive and new spacer.
mk3-one-piece-axle-t5774.html

Other less Norton ways are alien hubs.

7000 said:

I replaced my center stand this weekend. It was twisted beyond repair, and had extra bracing welded on, rather poorly. It looks like it may have come apart sometime in the past. Also, my primary chaincase has a chunk missing, where the sprocket is. I read on this forum about somebody's experience with a center stand coming off on the road, causing similar damage. Let me guess...Hobot's right, and I have bad damage to repair?

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If I'm imagining correctly where your piece of primary is missing, it probably had to do with the chain flying apart at speed and busting out the inside cover at the sprocket as it came whipping around. I've had that happen. If that's the case, your chain, or another chain, has been a repeat offender.

Could well have been a chain let go, but way more likely the crank or clutch nut came loose and got carried around to jam, as I've had happen by both nuts, one left hole in belt drive you can stick a pencil through. First time happened was first few days on it, had stopped to put mail in a box, eased off clutch at dead idle to ease a few few towards road, to hear a clank, 4 ft long line of oil spray out in front then dead silence! Nut had wedged between stator and outter case, whew.
But it did punch a knuckle size fracture in outter cover I had to beat down then file and sand and buff to hide but was oil tight wonder of wonders.

Would you be willing to post pictures of the assembly for those of us less gifted in visualization?

Sorry guys but I have been flat out at work and to give a pic of the axle and spacer would mean stripping the rear wheel. I can tell you that the full width axle was 9/16" diameter with UNF threads each end with radius undercuts on the thread runout to remove stress points, the spacer I made was if you could imagine drilling a 9/16" hole through the dummy axle till the exposed threaded section dropped off, but I made it from scratch so as not to scrap the original, it shouldnt be too hard to work out .
And just to top things off Wifey's triumph threw a rod on the weekend and she is on my case to fix it!

Thanks for all the help, everybody...I just installed a new chain, and it cleared up the problem. I followed some peoples advice on this forum, and got it from "OLD Brits". $27 for the chain, $10 for shipping...what a deal! I am humbled by everybodies knowledge and talent on this web site.