![]() Yes, you can do the same thing with a degree tape or a degreed damper, but you might need two people to be able to watch the tach and damper at the same time. There pretty simple, three leads, point at the flywheel, find the marker, youre good to go Theres a few finer points that needle that the markers on is adjustable. So hopefully this gives you an idea how that works. Then you look to see how many degrees you have the light advanced. So, I think in this case well consider it a video on how to use a timing light and how to check your idle timing on the outboard. The vacuum advance mechanism adds extra ignition timing at part throttle to improve economy and performance. When working out the order of the leads note that rotor arm rotates in anti-clockwise direction. I just went to my desired rpm and clicked the advance/retard button until the timing mark flashed on ZERO degrees. Make sure that you replace the ignition leads in the correct firing order of 1, 3, 4, 2. You should line up the timing marks with a timing light to 0 BTC, shut. I understand that the 350 should have about 34° TOTAL timing. Im using an aftermarket distributor with vacuum advance and the tech data states that it 'has 24° (crankshaft degrees) of mechanical advance (between 3,000 and 3,200 RPM). It has two digital windows side-by-side, one reads rpm and other reads the advance you have it set at. This means the timing is no longer computer controlled and can be adjusted at its base setting by rotating the distributor. I have regular street cam in this 350 SB. Got to say it was REAL easy to determine when your advance is coming in. I used a friends Snap-On digital a couple of weeks ago. He said the others, (dial type),will be off by 4 or 5 degrees when you are at full advance. If I got this all wrong I appologize in "advance" !!!! HA! HA!Īccording to Ignitionman the only rollback lights that work with modern ignition systems are the high end digitals like Snap-On, or MAC. as I would like to own one of these useful tools myself! I am no help as far as what brand to buy, but I will watch other replies to your post and see what suggestions other guys may make. Maybe someone else can clear this up for both of us. The only thing I am not sure of is if you need to add your initial timing to the timing found as explained earlier. You would then read the amount of timing marked off in degrees around the outside of the knob and that is your total timing at this rpm. They way I understand it, you can set your rpm anywhere you wish and "dial back" the timing mark to zero using the knob on the timing light (by "dial back", I mean watching the timing mark on balancer while your engine is running and adjusting the knob to bring back the timing mark to zero degrees). If your pulley or indicator is marked with degree settings, turn the crankshaft until the single mark and the appropriate degree mark line up. Although I don't own one and have never used one, these devices are very useful for discovering the amount of timing your engine has at any given rpm. ![]()
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