Sounds like you are setting the lag degrees as shown below. They under the dust cover. This is what I did without finding a written text. After pulling the covers of 3 mags I had in a bucket, I adjusted mine to 5.1 lines from the right as shown below. Counting started at the first line.I've got a Wico magneto that I want to ensure the impulse timing is correct on. Can anyone send me a pic (or just clue me in) as to where my timing marks are supposed to line up inside the magneto? Thanks.
That was how mine was set and I knew it was wrong.....I never check them but the po did liked to tinker so I went in!I was two ticks to the right of straight up
Members have mentioned this but I have not read of it actually done..... Maybe a search of the forum would help.Has anyone ever used a timing light to check timing on a Gravely? I’m going to break mine out and see what it looks like.
Well, let me ask this then. Theres a timing mark on the mag itself that represents when the mag is firing, correct? Mine has two dots that line up over each other and a hash mark as timing marks. If either of these are the spark of the unit then I should be able to take my adjustable timing light and set it on 30 degrees and adjust the coupler until I get the strobe of the light hitting the timing mark on the mag............. and I've got it set at 30 degrees advance. Am I right about this?To use a timing light, you need to have some reference to actual TDC of the engine and some way to establish the actual degrees BTDC you want for the actual running timing.
nhgravely,No good, it will always light up the mark regardless of where the actual timing is set. You need to view the relationship of where the spark is vs where the piston is. This is why the timing mark is on the crankshaft pulley in a car.
I have a timing light with a degree wheel on it. When I check timing on a car all I ever really need is a TDC mark on the balancer. I will dial in 30 degrees on my timing light and rev the engine and make sure that when all of the advance built into the distributor has been delivered my TDC mark lines up. This is usually higher up in the RPM range.No good, it will always light up the mark regardless of where the actual timing is set. You need to view the relationship of where the spark is vs where the piston is. This is why the timing mark is on the crankshaft pulley in a car.
The line is where the mag fires when the impulse isn't engaged. That should be about 5/32" BTDC. The two dots are where it fires when the impulse is engaged. That should be at TDC or a touch after.I see where I was making my mistake.
The timing marks I have............ one a line and the other is two dots. What do the different marks denote?