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Sendler, in post 27, bigscoot said that they would use a mulit-inject system so no carb and, since the Mazda Skyactiv diesel uses the gas engine ratio of 14:1, perhaps no increase in compression increase is needed. However, Mazda uses a glowplug for ignition and Bigscoot also has the sparkplug as an optionignition source
Bigscoot, looking for a bigger engine, I would like to recommend the relatively inexpensive Lifan 110cc engine. It has a stroke of 4.95 cm compared to the Zuma 4.36 cm stroke. I calculate a bore size of 3.535 cm to keep the 50cc displacement and the Lifan starts with a bore of 5.24 cm so a sleeve would have to be .85 cm thick or about 1/3" thick. As sendler notes, this could wellt interfere with the valves.
On the other hand, using the zuma cylinder, piston and head with the Lifan's longer stroke means that you would exceed the 50cc displacement without a (very thin) sleeve.
Well, at least your possibles have been clarified for you. Good luck.
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