40mm piston is a 43cc engine...The chinese used to try and confuse the USA customs into beleiving the engines were only 39cc to get them imported into other countries faster........Eventually they tipped their hand and now the newer bikes have the truer spec plaques and engine size markings...........
Both of the the Dax reps and the Mitsubishi rep engines that come on most chinese made pocketbikes come in either 40mm(43cc) or 44mm (49cc)...Theres mitsubishi rep scooter engines that are 23,,26 and 33 cc's aswell
In order to keep your engine from seizing and burning up you must mix the gas and oil ratio right aswell as keep it in tune with the lowspeed and highspeed needles on the carb if it has a pumper carb...if it has a floater carb I suggest getting a pumpercarb retrofit kit for it.......Break-in is 28:1 mix for 4 tankfuls of variating but gentle riding...I like to heat cycle mine a few times before introducing a load to it..After break-in you can safely run 42:1 even 50:1 but a safe mix ix 40:1.....Good Luck and post up some pics of what ya got.............Photobucket is the best way.....
Both of the the Dax reps and the Mitsubishi rep engines that come on most chinese made pocketbikes come in either 40mm(43cc) or 44mm (49cc)...Theres mitsubishi rep scooter engines that are 23,,26 and 33 cc's aswell
In order to keep your engine from seizing and burning up you must mix the gas and oil ratio right aswell as keep it in tune with the lowspeed and highspeed needles on the carb if it has a pumper carb...if it has a floater carb I suggest getting a pumpercarb retrofit kit for it.......Break-in is 28:1 mix for 4 tankfuls of variating but gentle riding...I like to heat cycle mine a few times before introducing a load to it..After break-in you can safely run 42:1 even 50:1 but a safe mix ix 40:1.....Good Luck and post up some pics of what ya got.............Photobucket is the best way.....