Tech Talk Forum for Norton, BSA, Triumph and Vintage British motorcycles circa 1900-1977 Online since 1997 with over 30,000 members worldwide.    Login FAQ Search Read new Post Guest options Top Norton Tech Talk Engine & Tranny Topics in this discussion: Sorted by last modified date   Discussion topic Author Last updated/author Replies Views Rating oil leak  My 1972 combat commando recently developed a new oil leak. I started to notice drops of oil on the toe of my right boot after a long ride and it has ccs1601 Mon Jun-30-08 12:06 AM by johnandnz 1 89 --- valve collets  Hi. I need to know, if the Norton collets (locks for the valves) have an angle of 7 or 15 degrees. sincerely Boronnow Boronnow Sat Jun-28-08 04:08 AM 0 26 --- ES2 cam timing  hi can anybody assist with intake/exhaust centerline figures(point of maximum lift in crank degree's) for an early fifty's es2. I am trying to ver rosco Wed Jun-25-08 01:01 AM 0 38 --- Breather valves solve oil leaks?  Hello everybody. I've come across an INOA article of a few years ago that talks of a brake booster valve being used in the breather line of a Comma Ian Wilson Tue May-27-08 05:40 PM by 750roadster 6 2485 --- clutch drag 70 Fastback - can't engage first gear  Still can't put in first gear. Now I realised that I have heavy clutch drag. Even though I replaced the stack with the Norvil plates and all is clean biky Tue May-27-08 12:22 AM by biky 5 151 --- greasing the primary chain? / push rod travel  Hi Guys First a big thank you for all the info and enlightment I found here! For many years I own, drive and fix the most on my 1970 Commando Fastb biky Tue May-20-08 06:32 AM by biky 3 203 --- Engine Oil Level  [View all] I recently bought a 1972 commando combat. The engine was reworked by the previous owner with the usual modifications to improve the combat engine inc ccs1601 Sat May-03-08 09:56 PM by lwmcd1 11 231 --- Engine Oil Level  This topic has been moved by the moderator of this forum. It can be found at: http://britir on.com/dc/dcboard.ph p ccs1601 Sat May-03-08 09:56 PM by lwmcd1 0 207 --- Exhaust Threads  Hi Guys, Anyone have the name of someone here in the States (preferably in the north east) that repairs exhaust threads w/o welding. I don't care for Ty Parker Sat Apr-26-08 10:04 PM by dynodave 7 790 --- '63 Atlas 750 valves  Hi, Looking for information reqarding exhaust valves. It appears to us that a previous owner ground the valve seat too much such that the exhaust val atlasdawg Thu Feb-07-08 10:17 AM by dynodave 1 184 --- 67 Atlas lubrication questions  Just bought a 67 Atlas in very good condition but it needs all the fluids changed and a general going over. I can't find the various weights of oil t dgcros Mon Jul-23-07 06:33 AM by dgcros 2 430 --- 67 Atlas lubrication questions  This topic has been moved by the moderator of this forum. It can be found at: http://britir on.com/dc/dcboard.ph p dgcros Mon Jul-23-07 06:33 AM by dgcros 0 426 ---