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I am using 98mm JE pistons & cylinders that I got from Jon @ EBS.
The CR is 10.5:1. Good service and reasonable cost.
The pistons are what are called the wedge type, similar to Max Moritz. Just be carefull if you are going to go with twin spark, as the second plug is not located in the correct place for these pistons. Check with Jon to see if there is a specific design for twin plug.
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