Port work effects port timing. Flywheel advance effects ignition timing. If a saw (like the 028) likes a bump in ignition timing when stock, it'll surely benefit from the same when ported. You also usually pick up a fair amount of throttle response off idle, with an ignition timing advance. Some saws don't like an advance in ignition timing, but they're usually far and few between.Vincent, I may port the cylinder in the near future. How will that affect the timing?
Also when you file the flywheel key -
Danny
- If the key is positioned straight up, do you file the left side of the crescent key
- When filing the key, I assume you only file that portion which sits above the shaft of the crankshaft
- What is the best way to hold the key while filing
1. If the key is straight up & you're looking at the end of the crankshaft (on the flywheel side), you would remove material from the right side of the key. You want the flywheel to move counter clockwise, which will advance it.
2. That is correct, you need the key to still fit snug in the crankshaft.
3. Clamp it with a pair of vise grips. I use the witness line on the key where it sits in the crankshaft. Somewhere around the half way up the key. I clamp it with the tip of the vice grips at this line. It gives you a flat line/guide to file against. You can then clamp the vise grips in your bench vise to hold while you file.