Cali conversion for jonsered 2139t

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AK jonsered

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Has anyone put a 45cc California edition 338xpt top end on a regular 338 or a jonsered 2139t? Are the carbs the same? Is there a weight gain?
Have a muffler mod and timing advance but liked porting my 2159 and was wondering if a ported cali would be better than my current climber.
 
Also, I am not a tig welder, are there any other ways to increase compression on these little guys?
 

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