Ported a Chinese Chainsaw Pics and Video

[Dan_IN_MN]

Sorry about that, that was rude of me. The dotted line represents TDC.

The angle between the blue lines represents the time the intake is open.

The angle between the red lines represents the time the exhaust is open.

The angle between the black lines represents the time the transfers are open

The angle between the red and black is the "blowdown", or the angle between the time the exhaust port opens and the time the transfers open.

If you picture the crankshaft angle as rotating from TDC clockwise, it's a map of the major
port events.

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[CristiRo]

Hello to everyone!
I have a 45cc Chinese Chainsaw that is modified.

Muffler Mod
Timing Advanced
Cylinder intake modded

And here is a vid:


I don't like that sometimes it four-strokes really hard in the wood.
Could be the fact that I modified the intake port a little and the exhaust is the same?
The H screw is turned 1 out, and than I turned it clockwise less than 1/4 turn to make is leaner.