Charon
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According to the test procedure in the Clymer manual, it isn't quite that simple. When the starter button is pressed, the decompression solenoid is activated and the engine is decompressed. After 0.2 seconds, the starter is engaged and the engine begins to turn. After 0.7 seconds the decompression solenoid is released. So the engine turns for 0.5 seconds "decompressed." What this does is make sure the starter doesn't have to try to turn the engine on the compression stroke as it begins the start. After the delay the engine will have gotten up to cranking speed and the starter, with the aid of the flywheel, will be able to turn the engine through compression. If you do it manually, you would operate your manual decompression control, operate the starter, then release the decompressor while continuing to operate the starter until the engine fires.
By the way, the engine will not run with the decompressor engaged. Thus, the manual decompressor can operate as an engine shut off. There are a heck of a lot of mopeds that use a decompressor instead of an ignition switch. Maybe Toyota should adopt that idea to prevent unintended runaway.
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