Featured 1976 One For 2022

Thanks but I already have the little ol' viking one earmarked for this build. The Admin Staff gets all mine. As you know, they are much more powerful if given as a gift.....just great aren't they?

 

Had some wet sumping - which took some sorting as the PRV and the oil pump both decided not to work properly (it was a new PRV too) so when I thought I had it figured out the other decided not to work. Still have a bit of stand off with the carbs but......sorted



Here's a before and after (or rather, after and before)



And a hand painted Zombie petrol cap just to finish it all off - hooray....



over....thanks.....

 

I actually stripped the engine down again to the sludge trap. It had a brand new Morgo and a brand new PRV. After our chat I was thinking cracked crank or, as you mentioned, maybe the trap plug letting by. I swapped the pump and the PRV with a known working pair from a good running bike so though I may as well go in for a look. Nothing, all was ok.
Bought a couple of LFHarris PRVs (they always come in handy anyway) and another Morgo pump.
While I was waiting for delivery I tried the new PRV that I'd taken off and still sumping. Took the pump off and bench tested - just a weenie dimple in the oil when pulling out the plunger. I tried re-seating without success.
Put on the new PRV and the Morgo and all is well. I measured the spring and dimensions on the failed PRV and nothing seemed wrong. Didn't test the spring but it felt ok. It still went in the bin.
So, it was a dodgy new PRV piston sticking I think. Then I fell into the trap of trying a working pump and PRV - that then both failed. Then convincing myself it was something I'd buggered up.
Is there a moral? Yes, it was something I'd buggered up but it wasn't what I thought it was......