(Less advance due to poor quality fuel I assume.) On later models it indicates 20 degree BTDC for the front jug and is the max advance mark for the exported bikes. The double dot on the early models indicates TDC for the rear jug. The single dot indicates 35 degrees BTDC for the front jug, and is the max advance mark for US bikes. In addition, there's a single dot mark and a double dot mark. Of course, not everyone has one of those. This is the easiest mark to see and makes it a real breeze to set the timing with a dial-back light. The BT Evo flywheel usually has three marks. It also helps to have the bike parked in the shade to reduce the sunlight washing out the timing light flashes. It helps to have fairly clean oil - if it's been a while since the last change, it can make it hard to see the timing mark. Some of the CCI or DragSpec ones are pure junk. They have excellent clarity, they're long enough to contact the flywheel and scrape off the oil, and the threads are decent. Get yourself one of those clear plugs that screws into the timing hole. I won't elaborate on aftermarket programmable ignition modules here. Factory advance curves are not always ideal for high performance Evos. What I'm describing here is just for setting the factory spec timing for a BT Evo that's not heavily breathed on.
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