Import Motor FAQ - Long Stroke Mills - Page 2

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Import Motor FAQ - Long Stroke Mills

This is a discussion on Import Motor FAQ - Long Stroke Mills within the Chinese/Import Minis - General Discussion forums, part of the General Talk category; I have 2 china 110's that from exterior measurments are the same, both are stamped as 107's one is my oldest sons, one is my ...

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Thread: Import Motor FAQ - Long Stroke Mills

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    I have 2 china 110's that from exterior measurments are the same, both are stamped as 107's one is my oldest sons, one is my daughters. I just recently bought another. Its an ebay special I got very, very cheap. Its stamped 107 but the cylinder appears to be close to 1 inch longer and 1 inch narrower than the other two. The kids bikes run really well and are semi auto's, this new one is gutless as can be and is a manual clutch. I bought it hoping to sell it for a small profit but if that doesnt happen will integrate it into the family and definately want to pep it up. I didnt realize the china 110's could be so different. Any clue which one this new one is. The old ones appear to be fairly square(bore x stroke) from the outside, this new one is more rectangular.

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    Here's one for ya...

    I tore apart a 124cc only to find that it's stroke was only 49.5 and bore 52.4...



    Thats not the unusual part though. The cyllinder was actuallly 78mm tall...Figure that one out. Most 110cc based engines 107,108.. have the 69mm tall cylinder with the 49.5 stroke and 52.4 mm bore.....????????Hmmm



    Troy
    One fine day!

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    Quote Originally Posted by Kurlon
    Interesting, where did you get the gearbox data? That's a much closer ratio setup that I'm using to seeing in an import mill.




    It's on the ebay listing under engine specs . Whether it can be trusted or not I don't know . What I can do is mark the flywheel and countershaft sprocket and count the flywheel turns to each C/S sprocket turn in each gear .

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    Quote Originally Posted by Kurlon
    Interesting, where did you get the gearbox data? That's a much closer ratio setup that I'm using to seeing in an import mill.






    It's on the ebay listing under engine specs . Whether it can be trusted or not I don't know . What I can do is mark the flywheel and countershaft sprocket and count the flywheel turns to each C/S sprocket turn in each gear .





    http://cgi.ebay.com.au/ws/eBayISAPI....ype=osi_widget

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    i have some info on the Loncin 107(called a 110) 3 valve engine.



    VIN id numbers:



    #.) VIN= engine id

    1.2.) LC= Loncin

    3.) 1= single cylinder

    4.5.) 52= rounded off for bore size of 52

    and then i think the rest of it is all engine# from the run



    mine says on the Ohalee website that its a 52.4x49.5



    it is a 3 valve with two intakes and 1 exhaust.

    also has a left-side cam chain and sprocket.



    Identifying marks are:



    "Loncin" on the left-side cover, as well as "Designed in Japan" curved underneath it.

    "3valve" on both the upper tappet and the cam side cover



    ill post some more specs if i take it apart

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    the last three numbers on the top row,



    FAH or FMH



    A = automatic clutch

    M = manual clutch



    i dont think anyone knows what F or H mean

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    Quote Originally Posted by Kurlon
    Winston, have you actually measured the bore and stroke on that motor?



    (And for reference, the Lifan 'Monster' tag refers to a specific Lifan 120 motor, all others are not monsters despite similar specs or bottom ends.)




    Kurlon is dead right . The actual 120 monster Lifan has ports that are larger (wider) , smoother and cleaner finished inside and the casting around the guide is larger diameter than the later "R" type big valve heads .

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    Quote Originally Posted by jkline805
    hey i have the same Lifan big valve with the 124cm3 on the cylinder that turned out to be a 52.4x55mm, but the funny thing is, my engine # is 156FMI. I dont think that you can trust any of the markings on the cylinder and apparently not the model # either. oh well.


    Take a look inside your inlet port and IF the casting boss around the guide is a large diameter and the port is a smooth , clean finish , you have a genuine 120 "monster" motor . We have one of them and it is a 156FMI . I pulled the head off it new to check the bore to see if it was 56 mm but it was only 52.4 . The 124 big valve 1P52FMI motor turned out to be a 120 with ports that aren't as good as the genuine monster 120 !

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    Just a little info I gathered while putting my 54x54 back together.

    Cam=short 68mm

    the wide spaced valve springs from DrAtv were too short, and "softer" than the stock valve springs.

    The 56mm copper head gasket worked well, but required a small amount of modification.

    I dont think the valves on mine are 27, 23 but I didn't measure them.

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    Quote Originally Posted by Z50King
    the last three numbers on the top row,



    FAH or FMH



    A = automatic clutch

    M = manual clutch



    i dont think anyone knows what F or H mean


    "For Auto Hammering"

    "For Manual Hammering"



    lol. Great thread Kurlon. Need more like this.

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    Has anyone compiled a list of the con rod and crank pin specs on the Chinese motors? I'm looking to do some parts swapping.....

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    I've not seen that info posted anywhere yet.

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    Anyone got ANY specs? We gotta start somewhere.

    The 50 I just tore down has a 23x39 pin. Rod has 28x14 BE. 94mm long.

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    the gpx,sdg 107, lifan 120, and every 90-110cc china motor has a 25x39 pin and the rcm 120 has a 26x39 pin.the honda 50-70 is smalled diameter but same length

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    Re: Import Motor FAQ - Long Stroke Mills

    got a loncin 125

    says 123 on cylnder

    bore 52.5 stroke 67.5

    pin hole 14 to piston top (flat piston)

    14 pin

    cyl height 69

    intake 23

    exhaust 19

    is this a 120?monster?

    bought a 138 kit from china the bottom of cylnder doesnt fit in the case hole

    and the studs are spaced different

    can i mod the cyland cace to fit or is it wrong

    china guy told me its for ducar 125

    also got inner rotor cdi light oil slinger works sweet rev-o-matic

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