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40 mm = 40 ccs & the 44 mm = 49 cc depending on your crank pin size will be either 10 or 12 mm
most 40mm kits use the 10 mm crank pins & the 44 mm use a 12 mm so you must find out what size crank (gudgen) pin your engine has if the crank is not included with the kit
im unsure what crank pin daves motors & ADA use in the 44mm kits as some use a 10 mm & some use the 12 mm depending on the boost port size etc...
13:1 or 15:1 dome for normal & premium pump gas
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