How to check if your motor is a 49cc

[mac90]

bore crankstroke and pin size are the main factors in working out cc size for these lil engines a slight pin change 10mm pin or 12 mm pin cranks changes the stroke by enough to take a 49cc to a 50.177

thats why they have 40-43 ccs in the 40 mm cylinders and 47-50.177 cc in a 44mm cylinder confused yet ??
so thats why some bikes rev that bit more than others & some seem to just go harder than a bike from the same shipment or dealer & some respond to mods better than others
pin size can make a difference in the window port u can put in a piston lots a lil things to make a good hard revving engine with a bit of go all round

[chipp]

bastards ripped me off oh well ive only paid half price
lol

[Dutch]

hmmm just check one of two i got and so far its 49cc, only been workin/updating the one bike eg fuel lines/filter - its nothing special so far its fair - so change spark plug tomorrow - get exhaust (prob fatboy+fueltank) and finish running her in, see how it all goes - after i'll update reeds-jets??

[KOOKY]

Originally Posted by mac90

bore crankstroke and pin size are the main factors in working out cc size for these lil engines a slight pin change 10mm pin or 12 mm pin cranks changes the stroke by enough to take a 49cc to a 50.177

thats why they have 40-43 ccs in the 40 mm cylinders and 47-50.177 cc in a 44mm cylinder confused yet ??
so thats why some bikes rev that bit more than others & some seem to just go harder than a bike from the same shipment or dealer & some respond to mods better than others
pin size can make a difference in the window port u can put in a piston lots a lil things to make a good hard revving engine with a bit of go all round

How does the piston pin have anything to do with it. You people spin me out with your fantacies. the center of the pin is the samme point if its 100mm or 1 mm so the stroke is the same. So get it right or tell me to fark off

[RD RACING]

very true Kooky but if you can understand the difference between the 10mm and 12mm size crank / rods , you will understand what is being mentioned. example is the 10mm size crank / rod has a normal stroke of 32mm, the 12mm size has a stroke of 33mm.

[KOOKY]

Its the gudgeon pin diameter. ie little end. Wake up.
Any way I`m nearly over it all. Too many know it all nothings. SORRY TRUTH HURTS

[mac90]

get a 10 mm crank & piston and get a 12 mm pin crank with piston installed in a bottem end and measure the difference yourself easy as that
then use the bore X stroke method and a engine calculator that 1 mm changes things
thats why some call the 12 mm pin crank a stroker crank can argue this one forever
easy way to say it is some cranks have a 32 mm stroke some have a 33 mm stroke

[RD RACING]

Originally Posted by KOOKY

Its the gudgeon pin diameter. ie little end. Wake up.
Any way I`m nearly over it all. Too many know it all nothings. SORRY TRUTH HURTS

i think you should wake up and listen to correct advice champ.

[KOOKY]

Too much wine last night. Sorry boys
I have engines with 33 x 10 and 33 x 12 with 44mm bores. they are both 50+ cc and excatly the same capacity as each other. you are right about the different stroke cranks. wich was my original point. Bore x strke gives its capacity. Not the cylinder alone.As I know you will agree Mac

[mac90]

no dramas m8 i think i need a 6 pack myself no particular reason just thirsty