Hi,

I noticed the Elky was getting a little hard to start lately. Seemed like timing was too far advanced. I checked it and infact it was idiling at 36 without vacuum to the canister. I revved the engine to watch the advance and the timing wasnt moving. Thought that was weird so pulled the cap off and noticed mech adv was stuck. However, the weights looked like they were in the closed position so cant figure why it had so much advance. After working on the linkages I finally got it freed up and loose. Now you can rotate the rotor clockwise and see the weights move out. Problem now is when I run it, base timing retards about 5 degs when I give it the gas! Why would the mech adv cause the timing to retard? Only has a couple degs of movement.

You can move the rotor freely to throw out the weights so I dont understand why when I rev the engine the timing retards?

Any suggestions? Oh yea..its a ProForm HEI

Thanks

Might just need some lubrication. A drop or 2 of light machine oil could do the trick. I usually use Triflow a teflon based lube.

Hi Chuck, Let me take a stab at it. take the rotor off and slowly move the weights to their full out(advance position) now gently allow the weights to return. I believe that it you look at the stops You will find that the rotor base is not resting fully on them and the ineretia from the engine reving momentarily seats them before the advance weights can react to the RPM increase.
MY Guess!

When you rev it and the timing retards for a second, is the vacuum advance connected?
If not, then I'm with Milan.
That or you've got a LOT of slack in your timing chain (j/k).

Wes

Thanks for the info.
The weights seem to move freely and I did lube the plates. I will work on it more tomorrow.

The vac adv was disconnected and the engine has less than 10,000 miles on it.
Figured I had the weights stuck out (full adv) from the 6500RPM shifts but that didnt seem to be the case.

Thanks again!

Thanks for the info.
The weights seem to move freely and I did lube the plates. I will work on it more tomorrow.

The vac adv was disconnected and the engine has less than 10,000 miles on it.
Figured I had the weights stuck out (full adv) from the 6500RPM shifts but that didnt seem to be the case.

Thanks again!

Chuck remember that the weights will return due to the springs but that doesn't Guarantee that both weights are at full rest. also it does take a moment for the weight to respond to a throttle "blip" is it possoble that you are seeing the lag. Lastly I would say try another timing lite. One final note the timing lite is trigered by the events that cause the plug to fire not the actuall module switching event that dictates advance. What this means is this the module may signal the coil to fire at "x" degrees. Untill the spark actually jumps the gap your light WILL NOT triger. Now there is a lean condition created by snapping the throttle that will inhibit the plug firing so we use the accelerator pump to enrich the mixture to allow the spark to fire (thus we avoid a lean missfire). It is possible that you have detected an opportunity to enrich you accelerator pump shot. however I would exercise caution in that under driving conditions you are at least partially into the power valve circuit. To make a long story short what you are seeing is likely normall and nothing to worry about unless you are hunting for that last ten thousandth of a horsepower. graemlins/waving.gif
Milan

Hopefully I will have some time this weekend to look at it again.
Got some good replies. Have a few new things to try.

Thanks for the help! graemlins/thumbsup.gif