weird exhaust port ,extra hole .

[henri]

barrel 001 by henri briggs, on Flickr     .
in the simonina barrel , theres a diagonal/angled drilling above exhaust port that goes down an opens into the exhaust outlet . anybody got any experience or knowledge of its purpose .or any theorys . H

[pugwash]

Its to help when kicking it over as it lowers the compression at kick speeds. But at higher engine speeds its doing very little as the hole drilling is only small.

All good

[henri]

thanks captain .H