21cc should be good if you have a good hemi or opened up combustion chamber.
You need to set your squish to 0.050" or more and less than 0.100" or cut the head.
You can cut from paper and add more basegaskets to get desired compression.
You timing should be at stock or retarded 4" initially. Hotter engines take less timing.
I would never put a reconfigured 2 stroke together without running a piece of solder on the piston to check the squish gap.
28-30cc is too big, do you have a picture of your chamber?
You need to set your squish to 0.050" or more and less than 0.100" or cut the head.
You can cut from paper and add more basegaskets to get desired compression.
You timing should be at stock or retarded 4" initially. Hotter engines take less timing.
I would never put a reconfigured 2 stroke together without running a piece of solder on the piston to check the squish gap.
28-30cc is too big, do you have a picture of your chamber?
