I have a test rig for pumps and p r v ,I have tested newly made stainless unit and found it leaking at 20 lbs ,
After investigating it turned out the threads were under size oil was passing by them before valve opens,
Tested a 60 odd year old original and that was 50 lbs , the pumps on rig are visible and when pressure build up I can see oil bleeding from the joints of pump , where as pressure is good we also need flow ,and some journal when ground loos the little flats where oil comes out and reduces flow

I stand corrected you do have it the right way round, I couldn’t see photo very well ,I now see your image is the for seal holder ,( at first it look light bottom slider , my apologies )

Other way round,

That’s interesting , wonder what chains was fitted then ,guess must be thinner side links ,did you clutch have Cush drive ,
( my bike also alternator model) , what did you do with you kit ,sell it ?
I did see on the net an article you wrote about your bike over some years ?
Regards Roy

First thing I would look at is the new spring you bought ,from some of the springs I have seen they are far to strong ,much stronger  than standard , state the obvious you have the pipe on right way round , I can take a while for oil to return , I would start bike and slacken off the nut that secured spring/ball to first see if any oil is being feed from pump up to crankshaft , another little check the gauze filter in sump is correct way round so hole in gauze lines up with scavenge on pump , be sure pump it’s self is flat against crankcase inside and not trapped on the location ring , I always slacken of feed pipe at engine end to make sure no air lock from tank to pump , in this cold weather it can take a while to get through oil tank filte down to pump , also some after market oil tank filters the gauze is finer that standard one , above  may give few thing to try ,

As mention before I have sold and use lots of these pumps and up to date every one has been faultless
All the best hope you get sorted Roy

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Yep - happened on mine twice now.  I don't like two chains running side by side.
There's no sprag clutch so the smaller of the two sprockets is constantly running at roughly three times crank speed.
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Thank you for reply ,sorry to hear you have had a couple of failures, if there is no sprag bearing in the system what’s is stopping the starter from spinning whilst engine is running ,
Have you ever grounded out motor, speed humps or Kerbs , getting my bikes in shed my be problem getting up small step ,Roy

Any one useing electric starter on there bike , twin/single ,any feed back regarding type and reliability etc

It may pay to to take out the little round inspection caps from rocker box just to check all the push rod are correctly located on the ball of rocker arms , just to be safe