Which motor is better and why?
Zongshen 120cc vs. Lifan 124cc
deep inseerd
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Which motor is better and why?
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You have to be a little more specific on which one? There are like 4 versions of the Lifan 124 and a few of the Zongshen 120. Some have crank mounted clutches, some have 52.4mm bores, some 54mm bores, different strokes, electric start etc.
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Didn't even know that - can you give me the rundown on the different models? In terms of reliability, durability, and parts availability, does any of these engines have a clear avantage?
We have been messing with these motors for quite awhile now and CRF is right there are differrant motors .
The 120cc Zong Shen motor with 4 disc primary shaft mounted manual clutch that starts in any gear. it has a big block with wider stud spacing for huge motor builds. the head has 26.5 intake and a 23.5 exhaust valves with a huge combustion chamber (this head is allmost exactly like a Kitaco SE head) it uses a steel cylinder which can be punched much bigger (close to 57mm) than other aluminum cylinder motors which can not be punched out with out a new sleeve put in. it uses a non scooter engine mount scooter engines come with a rubber bushing making the engine case mount even thinner and weaker. Studs used on the motors (whether Honda or Chinese) are 7.75mm and the hole in the case is around 8.10 have attendancy to crack the motor mounts (we have fixed on our bike by installing bigger bolts) these motors will produce 8.2 out of the box and allmost 11Hp with cam port and bigger carburator. see RCM 125 dyno results on the dyno thread.
Lifan 124cc also has a motor just like the above mentioned (SDG uses it) it has everything as the above motor has but is equiped with a aluminum cylinder.from what I have heard SDG has fixed the problems with the tranny and they work great I believe all 06 bikes have this change. folks this motor puts out the same Hp as our Zong Shen and SDG has been showing some pretty impressive dyno's and race results. I say way to go SDG.
Next there is a Lifan 124cc with the 3 disc. crank mounted clutch (cable comes off the front of right side case) this motors even thou it has smaller valves has some impressive torqe ratings . plus they are really easy to build into a race motor. the only draw back is that crank mounted clutches are just like your stocker just with heaver springs once you put some serious Hp to it you will have some slippage and will start to have some tranny issues there is a fix thou. rework your shift star by deeping the valleys on the star. do this in slow incriments and test it untill you get it right. the motor will feel slightly knotchy but that will go away soon but it will not pop into nuetral anymore. next you should change the detent arm spring this the little spring that makes it hold against the shift star. whats great about these motors is a stock Honda spring will work great.
Zong Shen also has A 124cc crank mounted 3 disc. manual clutch motor. it has the bigger valve head just like the 120cc with a steel cylinder. she is a fun motor to mess with. a little faster than the 124cc crank mounted Lifan and has a differant clutch feel. the tranny shifts real smooth. these are also availible in a all 4 up shift pattern (our RC90SX uses the same set up with only a 86cc displacement) since the tranny has a all up shift pattern the tranny problem are mostly eliminated.
The 120cc Zong Shen motor with 4 disc primary shaft mounted manual clutch that starts in any gear. it has a big block with wider stud spacing for huge motor builds. the head has 26.5 intake and a 23.5 exhaust valves with a huge combustion chamber (this head is allmost exactly like a Kitaco SE head) it uses a steel cylinder which can be punched much bigger (close to 57mm) than other aluminum cylinder motors which can not be punched out with out a new sleeve put in. it uses a non scooter engine mount scooter engines come with a rubber bushing making the engine case mount even thinner and weaker. Studs used on the motors (whether Honda or Chinese) are 7.75mm and the hole in the case is around 8.10 have attendancy to crack the motor mounts (we have fixed on our bike by installing bigger bolts) these motors will produce 8.2 out of the box and allmost 11Hp with cam port and bigger carburator. see RCM 125 dyno results on the dyno thread.
Lifan 124cc also has a motor just like the above mentioned (SDG uses it) it has everything as the above motor has but is equiped with a aluminum cylinder.from what I have heard SDG has fixed the problems with the tranny and they work great I believe all 06 bikes have this change. folks this motor puts out the same Hp as our Zong Shen and SDG has been showing some pretty impressive dyno's and race results. I say way to go SDG.
Next there is a Lifan 124cc with the 3 disc. crank mounted clutch (cable comes off the front of right side case) this motors even thou it has smaller valves has some impressive torqe ratings . plus they are really easy to build into a race motor. the only draw back is that crank mounted clutches are just like your stocker just with heaver springs once you put some serious Hp to it you will have some slippage and will start to have some tranny issues there is a fix thou. rework your shift star by deeping the valleys on the star. do this in slow incriments and test it untill you get it right. the motor will feel slightly knotchy but that will go away soon but it will not pop into nuetral anymore. next you should change the detent arm spring this the little spring that makes it hold against the shift star. whats great about these motors is a stock Honda spring will work great.
Zong Shen also has A 124cc crank mounted 3 disc. manual clutch motor. it has the bigger valve head just like the 120cc with a steel cylinder. she is a fun motor to mess with. a little faster than the 124cc crank mounted Lifan and has a differant clutch feel. the tranny shifts real smooth. these are also availible in a all 4 up shift pattern (our RC90SX uses the same set up with only a 86cc displacement) since the tranny has a all up shift pattern the tranny problem are mostly eliminated.
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