Join Date: Jan 2004
Location: 1613 E. Clover St. Casa Grande, Arizona 85122
Just a note on what I have mentioned before: most of the timing lights that I have seen that have the "dial back" feature where you can use the dial to check advance, are not accurate. Particularly at high rpm.
I leave the "dial" feature off and set the max advance that way, on the known factory mark or the mark I have added to the front pulley at the time I degreed the cams in.
Michael: Questions that need to be asked: Did you degree in the cams when you built the engine? Is the valve lash to specs? And have the carbs (or Spica) been properly jetted? Changing the timing can mask other settings that are not correct. For instance, advancing the timing with a rich condition will tend to lean out the mixture; and retarding the timing will make a lean mixture work, but not well. Incorrect cam timing will also change the flame front in the combustion chamber and cause poor driving characteristics.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
520-374-2220: please do not use PM, email me direct, saves us both time.
THESE are the good old days!
There are no easy answers to complex problems.