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Old 02-05-2015, 11:59 AM
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mapbike mapbike is offline
Motorized Bicycle Elite Member
Join Date: Mar 2010
Location: Central Texas
Posts: 5,379
Default Re: Curious about the engine, :question:

Here are some more pix, first set id of the four cyl/jugs intake ports

Top left is the common PK80 cyl. found on ebay from several vendors.

Bottom left is BGF cyl. with 40mm wide intake bolt spacing

Top right is larger rectangular transfer port PK80 type cyl.

Bottom right is actual GT5 cyl.

Second pic is of the different shaped transfer ports, the lower right side cylinder is the GT5 that I have started port work on, almost done but need to clean up a bit more and get the shaping matched between the two ports better.

Third pic with all cylinders in same order is of the exhaust port on each of these cylinder bodies.
Attached Images
File Type: jpg Different intk port examples.jpg (235.0 KB, 47 views)
File Type: jpg Different Tranfer port examples.jpg (229.5 KB, 50 views)
File Type: jpg Different Exhaust port examples.jpg (189.3 KB, 49 views)
I dont always ride WOT, but when I do..I do my best to keep the rubber side down..Ride safely my friends!
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