Subject: Re: adjusted points...idles fast now
Author: Bill Berry
Date: Aug 26, 2002, 6:12 PM
Post ID: 1710885632
Thanks...very helpful.
Chris in NC
On Mon, 26 Aug 2002 20:53:55 -0400
Robert Hawkes <3haw-@bluefrognet.net> wrote:
| Patrick, That was an excellent description. Can you continue on account of I have an old strobe light I would like to use on my Ambo. Thanks, BOb ----- Original Message ----- From: Patrick Hayes To: Loopfram-@topica.com Sent: Monday, August 26, 2002 8:18 PM Subject: Re: adjusted points...idles fast now In a message dated 8/26/2002 3:45:07 PM Pacific Daylight Time, chris-@charter.net writes: Whats an easy way to figure whaere they should be? Since there are three equidistant holes in the pulley halves, they can be mounted in three positions. Only one is correct. Remove both spark plugs. Remove the left side valve cover. Poke a wooden chopstick in the left cylinder spark plug hole. Slowly rotate the engin by hand at the front crankshaft nut. The engine turns couterclockwise at it travels through space. Or, it turns clockwise when you kneel in front of it and look backward towards the front of the motor. Watch the valve rocker action on that left side cylinder and feel the piston up and down with the chopstick. Watch the intake valve open and then close. As the pistonreaches the top, try to predict its point of TDC or Top Dead Center. You are now at cylinder number one, top dead center, of the compression stroke. Return to your pulley and note the position of the notch or notches on the pulley. If there is only one notch, it had better be at the casting arrow. If you have several notches, the LAST notch should be at the casting arrow. When I say last, remember you were just rotating the engine. All of the notches are in the same quadrant of the pulley. TDC will be the last notch to reach the casting arrow as the grouping spins by. As to the timing, you must use some kind of instrument. Not by ear or feel. The timing can be done static and the instrument can be as simple as a taillight bulb with wire pigtails. Turn on the key. Ground one side of the test lamp wiring. Attach the other wire to the points lead. Set the crankshaft on the last pulley notch BEFORE the TDC notch. Loosen and turn the distributor clockwise until the light goes out (=points closed). Now, turn the distributor back counterclockwise slowly until the light just ignites (=points open). Button everything up. You will have performed static idle timing. Not the best, but certainly good enough for most rides. Buy a strobe light and time dynamically for 4K rpm advance. Patrick Hayes Fremont CA |