Big Bore KIT porting only done on exhaust port;
with stock crank:
widen to 31 mm
raise roof 2mm
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with SFC
exhaust port :
widen to 31 mm
raise roof 4mm
lower floor 1mm
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warning :dont try to match exhaust chanell with port size or channel can bust open (holed) , so you can tapper cut only
SFC instalations:
veriaty of cylinders out there made by different companies so squish clearance can vary
squish band must be set at 0.5mm :
less than that means piston hit the head , any more will reduce compresion and engine will not make any power or may not even run ..
on most engines 2mm spacer should not be used , instead stack 3 to 4 base gaskets , each gasket is 0.3 mm so 5 will be 1.5mm .. some guys used only 3 gaskets ..
if more than 5 required then must use 2mm spacer and no gaskets ..use yamahbond 3 to seal ..
never use any type of sealant or paste on paper gasket , because when stacked the sealant may cause it to slide sidways
you may use smallest amount on case joints only
forward this to anyone with FCS crank:
1- case must be trimmed to make 0.5 clearance between crank and case,..can trim with half moon hand file , must trim at 45 degree angle , only cut from case centers
2-must instal spacer supplied or gaskets under cylinder
3-must remove the washer on 4 cylinder bolt so bolts can reach deeper
4-it maybe possible to run without base gasket as long as piston dont hit the head , in this case use small amount of yamabond 3 to seal ..check all clearances , 0.5 clearance on all parts required , if piston hit the head add one or 2 base gaskets till it clear
5-stroker crank increase dispalcement to up to 54 cc so is vibration , make sure there is rubber mount on pipes mount and all fasters torqued down
6- must port cylinder and instal pipe and jet kit
7- my pipe sold out so you can modify stock pipe as follows:
cut 1inch from header , add 1inch to belly , such mods make more torque than my pipe for indoor but fall short in outdoor tracks
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Let's rebuild the Full Circle Stroker Crank HOWTO sticky 
case? 
