Norton Commando 750 Restoration Video #111

Norton Commando 750 Restoration Video
Checking timing with degree wheel, problems found, goals
NORTON COMMANDO RESTORATION INDEX:

[dustybinns]

Mate, take the rotor off and chuck it in the closest hedge!! The only thing its good for is a door stop!!! On the early rotors the magnetic segments were only held in place by the ally, as was the hub. The later Lucas rotors had same part number cast into the unit but had a stamped "W" on the end, on these the segments were welded to the hub, problem resolved. I have seen several early rotors so loose they have destroyed the ststor and some have welded together locking the engine, get rid of it mate. Great bike, ride safe, Dusty, UK.

[stancoleshill]

Keeping an old Norton running well and in good repair, requires an exceptional mechanical skill. That's why men like them so much. It is a competitive challenge between men as to who can do it the best. I'm one of these men. I am also hooked on the challenge.

[jojomama]

yeah, TDC and a degree wheel should get you where you need to be, looks like you'll have many years of happy motoring...good on ya!!!

[scottb]

Different ways of finding TDC on the degree wheel: Position wheel 0 and pointer as close to TDC as you can guess. If you touch the piston stop before 0, then again after 0 degrees, you can subtract the smaller number from the large one and divide by 2, which will give TDC # on the side of 0 towards the larger reading. For example, say 1st stop is at 10 before 0, then second is 30 after: (30-10)/2=10 degrees, which is TDC after 0. If both readings are on the same side of 0, then a simple average works. Example, 10 degrees after and 30 degrees after, TDC is (10+30)/2= 20 after. However, the way I've always done it is to always think the same direction as the crank rotation (more useful to think that way when degree-ing valve timing / adjustable cam sprockets anyway). I read first stop, rotating in crank direction and write it down. Then I counter rotate until stopped and write it down. Calculate the difference in the "missing" (non-swept) area of the degree wheel, divide it by 2, then "add" that to the first reading by counting it out on the wheel divisions in counter rotation direction...then I adjust the pointer to indicate 0 exactly rather than move the wheel. Check and repeat if needed....BTW... some engines with either splayed valves, oversized valves, angled spark plugs, high lift / duration cams, or all of that, don't work with a regular spark plug hole piston stop - the valves interfere with the stop. If you do that, the valves can be damaged from binding against the stop. For those engines I use a long slim (3/16" Dia.) screw - on extension on a 0.001" grad. dial test indicator thru the spark plug hole to read the same piston height on both sides of TDC instead. If that won't do it - worst case is removing the cams, push rods, rockers, or whatever it takes so the valves stay closed, then find TDC using the piston stop. Once TDC is found and set to 0, then put the valves back in operation and adjust the valve timing....

[BobMatthews]

The marks on the rotor may not be as far out as you think as I'm not sure your tdc was correct. If it was 50 degrees one way and 13 the other, then tdc should be at 18.5 degrees no? 50 - 13 = 37, 37/2 = 18.5 Don't worry too much about the smoke, it took my Norton well over 500 miles for the rings to bed in properly. Have you tried adjusting the air screws on the carbs? They should be between 1 & 2 turns out, if they are out of range it suggests either a blockage in the pilot circuit or incorrect pilot jet sizes. The engine sounds great :)

[tonyshortland]

looks like youre on the final fiddlings, it does take a long time to finish of, but jobs a good'n. well done, i would be a bit concerned about the smoke, when you get it running without the choke it may be better..

[grantsnell]

When you were turning the timing wheel to the left, I could see the timing wheel moving more than the chain.

[scottfree]

I've been watching for 4 minutes and I'm still trying to figure out what he's doing.