Adjusting the valves, quick and short questions., NOW I need help on timing !!!! PLEASE Options

[913B]

I am checking the valves because they seem noisy and also to track down an erratic idle
I have read the rocking method but I would like to stick with the dizzy and TDC method please.

I read cyl #1 & #3 has same TDC and #2 & #4 has same TDC

Question 1 – Setting TDC on the fan notch does it have to be at “0” or will the notch for “27BTDC” work too

When I find TDC for #1 on fan notch and dizzy rotor is pointing to #1 tower of dizzy cap

Question 2 - Can I adjust all the valves for #1 and #3 cyl ??
Then rotating the motor to #2 TDC on fan notch and dizzy is pointing to #2 tower

Question 3. Can I adjust all the valves for #2 and #4 cyl ??

Question 4. Is it wise to replace the cork valve cover and not risk a leak.
The gasket is pretty new though and low mileage since I last had them off.
I am thinking of purchasing the 914rubber re-usable ones. Any recommendation’s

Thanks everyone !
Ted

[913B]

Ok the valve adjustment is done now trying to time it at 27 BTDC with the mark on the flywheel on top of the engine.

I disconnected the vacuum lines from the dizzy and plug them up

Ran up the RPM with an assistant to 3500

adjusted my snap on timing light to read 27 and adjusted the dizzy until the mark came up on the flywheel

tightened dizzy down

connected the vacuum retard to dizzy

BUT now I cannot adjust the idle, I turn it CCW and it appears it wont go above 600 rpm, seems like I can unscrew the idle screw all the way and have no affect

what gives ???????

Any help is very much appreciated !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!