What causes the CB400 to stall when the tachometer hits the bottom upon starting?

[KevinLynn]

The reasons why the CB400 stalls when the tachometer hits the bottom upon starting are as follows: 1. Circuit failure: This may be due to low-voltage power failure causing the stall. At this time, you can mainly check the ignition and starter switches, as well as the fuse box. A short circuit in the low-voltage line causes the stall, which in this case is intermittent. Check the low-voltage lines in the vehicle. 2. Component failure: This issue is generally related to the ignition coil, capacitor, or electronic ignition module. The vehicle may start initially but stalls after a while, then can start again, only to stall once more. 3. Fuel system failure: Damage to the fuel pump, fuel line rupture, clogged carburetor fuel inlet, or an empty fuel tank. However, in such cases, the vehicle can still be restarted, though with difficulty. Problems with the ignition system or the engine overheating anti-explosion system can also cause stalling.