- Oct 10, 2017
Anyone got any info on the Jim Comstock breather for 71 Commandos.
Hi, Kenny. I am working through my 850 and I noticed a breather in the "old magneto location" on the back side of the timing cavity. The bottom sump plug is compatible with the breather that I bought from you but I'm confused about that breather (these cases are prototype cases; I think they're either the first or second set from the foundry when the first 850 experimental cases were being made - I occasionally find things that are different from "production" cases).NYC Norton is the exclusive supplier of the sump breather you mention, originally designed by Jim Comstock.
You can find them here: https://nycnorton.com/product/reed-valve-breather-kit/
If you have the frame crossmember up near your sump our breather won't fit, unfortunately.
Item 38 (06-4200).Is the stub on the back of the timing side usually found on 850s? There's no plate, it's a cast flat area where the plate used to be on the early 750 cases.
Was this a Norton design that did not work well?
Thank you. OK, we have the stub on my cases, but it's different because the stub is fitted right at the corner between the back of that "timing case ear" and the actual case. Oh, the joys of working with non-standard parts. I assume that the stub is the same and, if there's a plug in my kit, the plug will fit OK (stub diameter appears the same).Item 38 (06-4200).
Andover Norton Parts are the only Norton spare parts in the market manufactured to original drawings, within the factory-approved tolerances, from the correct materials, and with the correct finish.andover-norton.co.uk
OFF AN 850 MK1 ENGINE. NORTON COMMANDO 850 CRANKCASE. In Order To Keep The Cost To You As Low As Possible, We Do Not Undertake Any Cleaning Of Any 2nd Hand Item Sold, Everything Is Listed Exactly The Way We Found It In The Shed.www.ebay.co.uk
OK, we have the stub on my cases, but it's different because the stub is fitted right at the corner between the back of that "timing case ear" and the actual case.
I assume that the stub is the same
and, if there's a plug in my kit, the plug will fit OK (stub diameter appears the same).