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Old 03-24-2015, 07:03 AM
cannonball2's Avatar
cannonball2 cannonball2 is offline
Motorized Bicycle Elite Member
Join Date: Oct 2010
Location: Colonial Coast USA.
Posts: 3,286
Default Re: Who's Running the Super Rat?

Hers some info folks. I have learned more about engine specs from the Grubee site than anywhere else. I believe I posted a link in the other Grubee thread and encouraged reading through the engine sections.
Heres some more info.
Notice the cranks pic shows what appears to be the ZAF80 rod that would indicate the 40mm crank. Notice how nicely finished it is. the rod also has 23 rollers and deep oiling slots.
Look in the exploded engine pic at the large counter weights. This is similar to a half breed crank. Notice also the low pin piston!
Pic three jug dimensions
Map pic four is for you, another indication of the SR/SM 40mm stroke.
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