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Originally Posted by Kurlon So, fun question is weather or not that bore kit was installed at build time by Lifan or by the shop selling the motor... If you get a chance, crack into that mill, get some pics, and take some measurements. : ) |
I bought one Lifan B/Valve kick in gear engine (1P52FMI) with 124 cc on the cylinder and pulled it down to find that it had a 52.4 bore x 55.5 stroke (119.73590666161965 cc) The output shaft has a 17 mm coarse spline :
and another Lifan B/valve kick in gear engine (1P54FMI) with 138 cc on the cylinder that is 54 mm bore x 55.5 stroke (127.15965846442622 cc) :
and I also have another Lifan B/valve crank clutch motor (1P54FMI) that has 138 on the cylinder , that I suspect is a 54 bore x 54 stroke (123.72291093836067 cc) but I'll be able to find out now (thanks to the info in this thread) , by checking the diameter of the countershaft .
I checked the countershaft and it has a 20 mm coarse spline .
Apparently , they have a taller 1st gear ratio than the kick in gear Lifans . Here are the specs of them :
Specifications:
Single cylinder, 4-stroke, 2 valves, OHC racing head, air cooled, 125cc
Bore x Stroke: 54mm x 54mm, this is a 'square' engine for best balance between power and torque
Valve Sizes: 27mm intake, 23mm exhaust
Displacement: 123.7cc
Compression Ratio: 9.47:1
Gear Ratios: 1st 2.833:1, 2nd 1.706:1, 3rd 1.238:1, 4th 0.958:1
This is the same as the (1P54FMI) "138" Lifan crank clutch engine and has the same type of flywheel cover !
http://cgi.ebay.com.au/ws/eBayISAPI....ype=osi_widget
They are also selling 140's with 55 bore x 59 stroke on ebay OZ :
http://cgi.ebay.com.au/ws/eBayISAPI....8492&rd=1&rd=1