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The compression release on the 650 Savage is controlled by an automatic electronic control system solenoid that senses when the starter is engaged and registers the timing in order to release compression on the exhaust valves upon initial cranking and then engage it when the starter reaches its full rpm's. the selenoid is connected by cable to the compression release on the head of the engine. To test this unit first understand that this control has 2 timers one that releases the compression for about 0.7 seconds for release and a second timer that engages the compression after about another 0.5 seconds returning the compression lever on the engine to normal position.

To test the first timer remove the seat and unplug the wiring harness from the automotic decompression control box. Then set a DC voltmeter to the 25 volt range at plug the (+) leat to terminal 3 and the (-) lead to terminal 5. Now hook up two jumper wires one from the (+) side of the battery to terminal #1 and the (-) one to terminal #5 . The voltmeter should read 12 volts for 0.7 seconds and then go to zero.

To test the second part of the circuit hook a jumper from the battery to terminal one and two and the negitive battery terminal to terminal 5. Now run the (+) side of the voltmeter to terminal 4 and the (-) side of the voltmeter to terminal 5. the voltmeter should read 0 (zero) then after 0.2 seconds of starting it should read 12 volts thereafter.

*NOTE; the terminals on the control unit if the plug is facing you and the notch is on top read from left to right on top 1,2,3 and on bottom 4,5,6.

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