MadAss125 with Lifan150

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rossi1959

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hi all, anyone know what the standard motor is in the MadAss125,I have heard it is a jialing 125, I pulled it and put a YX140 and pulled that and put the Lifan150 in, the Lifan lasted 7 days before the dreaded kick starter gear that slips into the back of the clutch drum sheared and cracked the case. does this happen with the can't start in any gear motors or for a better phrase the motors with the clutch on end of crank . The standard MadAss motor is a IP52FMI it has a 52.4 bore and a 55.5 stroke it has clutch on the end of crank is a 1 down & 3 up shift . now that the Lifan is junk(cheaper to buy new one) I am wondering if the crank , rod, barrel & head off the Lifan would fit the standard MadAss motor. In the meantime the YX goes back in. Any thoughts would be muchly appreciated. cheers.
 
bad kick starting practices cause this

because of the high compersion in the 150

to bad about the case the gear is easy to fix but unless you can get the case rebuilt then that idea is out so 140 for you
 
Thanks for reply ,yes I know the kick start sequence as I owned a tt500 years ago (push past top dead with kill switch held) , culprit I think was timing as I had a standard lighting coil and rotor fitted along with a racing cdi with advanced settings. Lesson learn't. I have pulled the standard MadAss motor's barrel off and found the cam gear has the same markings as the Lifan 150 (dont know if that means anything) But the gudgeon pin is 14.1 mm which I have never seen quoted on any site, I've only seen the 13mm & 15mm can you shed some light. The head has 27mm inlet & 23mm exh valves ,thats as far as I have got (going to watch some of the Bathurst) so I will keep going and pull the Lifan apart and see if I can fit the crank(if I have to) and whatever else I need to into the MadAss motor. Cheers.
 
MadAss125 Motor

I am pretty sure that its the Lifan 120 lecky start, IP52FMI, 52.4x55.5, 14mm Piston pin, 27in x 23ex valves. Could this be a Zongshen???, any one shed some light please??
 
Zongshens have YF cast into the valve heads whereas Lifans have DQ ... also the Zongshens have rubber O-rings between the head and right side cam end plate ... A Zonger should have a Z in the engine number ... and they use chinese ball bearings for the cam whereas Lifans have clearly marked Jap bearings ...

The Zongers also usually have an older style looking clutch cover with an oil sight glass up front ...

Here's a site with some pics ... hit on the pics to enlarge them ... They also seem to have the older screw in style valve covers ...

Google Image Result for http://zongshenaustralia.com/images/products/es125eng.jpg

Google Image Result for http://www.made-in-china.com/image/2f0j00mMKtpOQsfuboM/ZONGSHEN-110CC-125CC-Air-Cooled-Engine-WV-EP017-.jpg
 
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Thanks for reply CJ, I have since found out through Perth street bikes forum that it is infact a Lifan 120 , but you stated that the valves from the zonker has YF cast in, did you write in the wrong sequence when you refered to the letter castings ? as this motor has YF and has 2 bolt rocker caps and also has the same cam drive gear as my Lifan 150 IE: same markings like the diamond shape under the TDC dot and CQJL directly opposite. Any bodys guess to what parts are used in these motors as I have found 6 different makers.
 
The engine assemblers get their parts from all over the place in China so any engine can have any part in it ... :p

There is a black Lifan 125 engine which looks exactly like a Zonger only it has two bolt valve caps instead of screw in caps and since they both have big valve heads they most likely use the same source and brand of valves ...

Your bore and stroke figures are for a 120 cc engine ...

No I didn't get the letters on the valves wrong since I looked at two brand new heads I have here ... The DQ valves are in the head off a Lifan 125 super motor ... bare alloy head , bare alloy cylinder with 124 cm cast on it , metallic grey cases , mainshaft clutch (kick in gear) 4 up tranny ... 52.4 x 55.5 actually a BS 120 ... :p
 
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