RE: CDI gr8flyer55
[youtube]http://www.youtube.com/watch?v=ZeTnrpk25X4[/youtube]
Engine makes 4514 rpm with a 20x8 prop, I don't have (can get) a 16x8 prop at the moment.
I can't start the engine by hand, I need a startrope.
BTW, the tool on the picture is a TDC-tool and also a compression checker.
If you turn the prop / shaft, the pin wil be in and out if the comprssion is OK.
If you turn the prop / shaft you can also see and mark with the ring the TDC.
If the pistion goes up and down, you can read the distance and calculated back to degrees.
Nice to use if you don't want or can't use a degree disk.
The distance between TDC and UDC of my Homy is 28.41 mm
1 degree will be 28.41 / 360 = 0.07892 mm
If the ignition must be 30 degrees BTDC, the calculation wil be 0.07892 x 30 = 2.36 mm BTDC
With a caliper it's easy to do.