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Old 01-29-2013, 05:09 AM   #67
Beastly Adventurer
Joined: Aug 2008
Location: hunt country virginia
Oddometer: 1,375
Originally Posted by KASUYAHO View Post
It will be interesting to see what way they decide to go with the engine to get 450cc seeing there keeping to same size bore.

Great to see guys / girls thinking outside of the box

Good luck Jenny

102x84.5 is 690 specs

so 102 bore with 55 mm stroke is 450 cc

so they will lengthen the rod and drop the wrist pin to make up 30 mm in stroke. It sounds like they are doing mostly rod lengthening because they are going to use the same basic piston as a hi comp 690 piston (close to stock wrist pin location therefore)

This should keep the scrutineers scratching their scalps
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