Planet Minis

The 26incher · 05-27-2007, 03:05 PM

Hey guys! Well I put a Lifan 120cc engine in my 73 Z50 and I was very impressed with the power and speed. The only problem I do have is the tranny skips 2nd when down shifting sometimes(skips in N). Guys on Evil-bay are selling new Lifan engines with a bore and stroke of 55mm (bore) 59.2mm (stroke). Does that make the engine a true 140cc? I've been told that the 138cc engines are 124cc? Also, the new engines are an all up shift pattern. This seems better to me. Has anyone had any luck with this new engine? I'm planning on putting the engine in a 1971 CT70. What type of HP and top speed do you think I can get from the 140cc engine? I have my little Z50 geared for top speed with the 120cc engine and it does 55mph(8 inch wheels, sea level and 175lbs rider). Do you think I can get 65mph with 140cc engine and 10 inch wheels? Any help will help. Thanks for looking.

HACKMUNCH · 05-27-2007, 03:15 PM

the new lifan 140 is 4 up tranny which uses the exact same trans thats in the gpx (jialing) so the false neutral (between gears) should be just fine. the new lifan 140 uses a ci cyclinder which should be thrown in the garbage as soon as you get the engine. you must run an oil cooler with this engine unless you plan on putting in new pistons all the time. the lifan 140 has the oil ports off the crankcase so make sure if you are going to run it with out an oil cooler that you make a oil line between the 2 passages on the engine. the lifan 140 is a goood base engine to start with, stock hp is around 9hp.

05-27-2007, 03:05 PM	#1 (permalink)
The 26incher 1st Gear Member Join Date: Nov 2006 Location: Torrance, CA aka The Darkside Posts: 225	Lifan 140cc....Help please? Hey guys! Well I put a Lifan 120cc engine in my 73 Z50 and I was very impressed with the power and speed. The only problem I do have is the tranny skips 2nd when down shifting sometimes(skips in N). Guys on Evil-bay are selling new Lifan engines with a bore and stroke of 55mm (bore) 59.2mm (stroke). Does that make the engine a true 140cc? I've been told that the 138cc engines are 124cc? Also, the new engines are an all up shift pattern. This seems better to me. Has anyone had any luck with this new engine? I'm planning on putting the engine in a 1971 CT70. What type of HP and top speed do you think I can get from the 140cc engine? I have my little Z50 geared for top speed with the 120cc engine and it does 55mph(8 inch wheels, sea level and 175lbs rider). Do you think I can get 65mph with 140cc engine and 10 inch wheels? Any help will help. Thanks for looking.

05-27-2007, 03:15 PM	#2 (permalink)
HACKMUNCH 3rd Gear Member Join Date: Apr 2006 Location: BRUNSWICK OHIO Posts: 5,239	Re: Lifan 140cc....Help please? the new lifan 140 is 4 up tranny which uses the exact same trans thats in the gpx (jialing) so the false neutral (between gears) should be just fine. the new lifan 140 uses a ci cyclinder which should be thrown in the garbage as soon as you get the engine. you must run an oil cooler with this engine unless you plan on putting in new pistons all the time. the lifan 140 has the oil ports off the crankcase so make sure if you are going to run it with out an oil cooler that you make a oil line between the 2 passages on the engine. the lifan 140 is a goood base engine to start with, stock hp is around 9hp.

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