![]() If the test vehicle has a different electrical system (6 or 24 volt system, etc), an auxiliary 12 volt battery may be used to power the timing light. Thanks, now i remember, i just found the peice of paper and read it and forgot is on top of the 12 initial. The MT2261 A Computerized Tach/Advance TIming Light can be powered by a negative or positive ground 12 volt DC power source. your timing light should enable you to set an rpm and see exactly what the advance is, so you can ramp it up to 6000 and see if you have 32 but beware spinning fan blades and rotating mass (flywheels) which might decide its a good time to fly off (its hapenned). Your centrifugal advance kicks off at 1200 so you wont see 12 at 1500 (but should at 1100) at 3000 it should be 22 (initial plus 10 ) at 6000 should be 32 total. Hope im reading this right, 12 initial is your idle speed setting (initial advance) Ive never owned a advance timming light, in the past ive just set the dizzy with no.1plug out and set it on the road so maybe i sound a bit dumb here but my specs from the distrubtor say. Lock the dizzy down and set the idle RPM back where you want it.FCCOOL wrote:ok, looking at the buttons i think i see how it works. You use ZERO because your light is flashing 11 BTDC. Rotate the dizzy until the engine's ZERO marker lines up with the pointer. Press the FLASH button and the light/strobe should start. Using our example above, you would press INC until "11" is displayed. Switch to advance mode and use the DEC or INC buttons to change the time at which the light flashes. In tach mode bring the RPM up to 1000 using the idle speed adjustment screw. Then switch to tach and adjust it to the correct number. Now use the Tach/Adv button to select degrees. and that full advance should be something like 30 degrees at 1500 rpms. Let's say you want to SET the timing to 11 BTDC at 1000 RPM. tell you that base timing should be something like 4 degrees at 500 rpm. What you do need to know is how to use the feature. you don't have to know the factory specs for your engine. To use the advance feature he mentioned above. To elaborate on the above, the black clip goes to an earth point, the red clip goes to +12V (the battery terminal on the starter solenoid is such a point) and the inductive pickup clamps onto the plug wire for cylinder #1. Use the same thing to check full advance. When you use the light set properly it will read zero degrees at the set rpm IF the timing is correct. The timing light is energized under the control of ignition pulses from the ignition system, so that timing mark appears to be stationary when illuminated by the timing light. Lock the dizzy down and set the idle RPM back where you want it. Snap-on Tools Usa Computerized Tach Advance Timing Light Mt1261a W Pb48 Case 249.95 View Item Details Vintage Early Snap-on Timing Light As Is 25.00 View. You use ZERO because your light is flashing 11 BTDC. Locate Snap On Timing Light on sale below with the biggest option of Snap On Timing Light anywhere online. Rotate the dizzy until the engines ZERO marker lines up with the pointer. ![]() Then switch to tach and adjust it to the correct number. Press the FLASH button and the light/strobe should start. They will tell you that base timing should be something like 4 degrees at 500 rpm. To use the advance feature you need the specs for the engine. Now it will display the rpms of the engine and can be used as a standard timing light. It should come up and ask you to select number of cylinders. Hook up the battery leads, Clip the pickup on cylinder number one. Flash - On/Off for the strobe Dec - Decrease the setting Inc - Increases the setting Basic use. ![]() Stole this from another site (where someone asked for a manual for the same model timing light), maybe it'll help you: Reset button - resets the light to zero Tach/Adv - Toggles between the tach setting and the advance settings. This is the best I could come up with after Googling for a while: Quoting from that site.
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