Well I suppose this was inevitable.

Major hassles starting and plug fouling etc. People did say about old seals perishing ........

Seems the main bearings have failed as noticeable movement when a lever is placed under the magneto. I have decided not to enter the Tamar Trial as it may not be ready. I'll be ordering an engine re-build kit on the 'morrow.

Any helpful advice on the re-build will be gratefully accepted.

Edited September 21, 20169 yr by netley

NGK seem to enjoy sticking random letters before and after the heat range nomination, covering v'eed electrodes, platinum and iridium tips etc, etc.  I looked up the BP5EV and it seems that you can only get a BP5EVX, so I visited the NGK site and here is a link to the NGK Motorcycle Catalogue.  This is what we need, at last.  It explains all the nomenclatures and explains why and how different designs do what they do.  Have a good look:

http://ngkntk.co.uk/wp-content/uploads/2016/02/MotorcycleCat2016.pdf

Make what you will of it, but I think I will try BP5EVX on my Sherpas, or perhaps even the BPR5EIX in Iridium.

 

Maybe we should all go diesel, or even electric!

BP5ES had same plug in for 2 years never give me any problems.