I continued to pull the jug and it looks to be very tinkered with, so my question is: Could the relieving of the exhaust port/bridge to such a degree (or any of the other porting) lead to the compression being so low, ie 25%+ from the norm? And as the work looks unevenly done (on all bridges), by perhaps another amateur mancave mechanic, does that even matter?
Is it recommendable to reduce the squish clearance and mill the top of the jug and head, perhaps up to .5mm total (ie .25mm each)?
Appreciate any feedback from the porting pros, upon looking at the photos. Thanks in advance!
![Image](https://bannedcr500riders.com/images/auto/fe21108b3574613001a4a2e135352760.jpg)
![Image](http://i1280.photobucket.com/albums/a500/kenzonut%0A/exhaustbridge.jpg)
![Image](https://bannedcr500riders.com/images/auto/4bb9ae103fe14bd5839108a90faf0498.jpg)
![Image](https://bannedcr500riders.com/images/auto/43fdfb17214eb5168c347399400bfbb0.jpg)
![Image](https://bannedcr500riders.com/images/auto/605f4f72c575e2336a694afad1793658.jpg)