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This link should be able to help......One thing to remember is not to make the opening much wider than you can open up the pipe flange...........

http://www.pocketbikeplanet.com/showthread.php?t=59620

For the inner side of the port at the cylinder...............You can go as wide as 1/8" on each side and as much as 1/8" high with a rounded top and sides shape depending on whether youre keeping or losing the basegasket...

The shape at the cylinder side is whats important aswell.........A half flattened football shape works best with a round output hole to enhance revs
 

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Discussion Starter · #3 ·
Really helps Thankyou love your work cam2 I'm also going to do a stock pipe mod and have just got a blata 3.4 pipe for a very good price aswell so let the cag modding commence
 
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