Final Drive Chain, DID 520DMA4K, 114 links.Starter Primary kickstarter with automatic decompressor.Fuel System Fuel injection, dual-injector type.Engine 249cc, 4-stroke, liquid-cooled, single cylinder, DOHC.Base Mode: Standard power launch, no action required on the S-HAC switch.Benefit of Mode B: For skilled riders, and/or good starting conditions, use Mode B for a more aggressive launch.One of three conditions will return the ignition to normal operation (whichever happens first): After six seconds or when you reach fourth gear, the system shuts off and returns to normal ignition timing. The ignition timing alternation is in a similar sequence as Mode A, but with increased overall timing. S-HAC will advance the ignition timing to allow increased throttle response and stronger acceleration off the line. Mode B: When conditions at the starting gate have better traction, and a more aggressive launch is desired.Benefit of Mode A: For novice riders, and/or hard and slippery traction conditions, use Mode A for a more controlled launch.After six seconds or when you reach fourth gear, the system shuts off and returns to normal ignition timing. It also advances ignition timing during this sequence for stronger acceleration.

In this mode, S-HAC alters ignition timing at the moment of launch and the ride over the gate to reduce wheel slip to deliver a smooth takeoff. Mode A: For hard surfaces or slippery conditions at the starting gate.There are three S-HAC modes riders can choose for the best option per their skill level and starting conditions.

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