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Thread: Loncin GN250

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  1. #31 Re: Loncin GN250 
    Senior C-Moto Guru MJH's Avatar
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    http://www.suzukicycles.org/GN-serie...rochures.shtml

    http://www.motorcyclespecs.co.za/mod...250et%2093.htm

    The GZ250 is listed with the EPA as four-valve as well, that model has the GN250 engine.
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  2. #32 Re: Loncin GN250 
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    then when you look here it has it as a 2-valve and also as a twin and it is not.
    http://www.motorcyclespecs.co.za/mod...auder%2099.htm

    Since the EPA has it as a 4-valve that you would think would be accurate, since that is submitted by the manufacturer.
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  3. #33 Re: Loncin GN250 
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    Here is a manual....http://www.scribd.com/doc/5321965/GN250-Manual

    That engine may have more then one version? They call it a TSCC twin swirl combustion chamber and why it has two exhaust ports.
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  4. #34 Re: Loncin GN250 
    Senior C-Moto Guru MJH's Avatar
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    I really only want a grass tracker, it can have either engine, but not a bored out 125cc with only 2-valves. I want a 4-valve OHC and one that gets close to 20hp legitimately.


    The TU is vanilla for me.
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  5. #35 Re: Loncin GN250 
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    I also would like full instrumentation, not just a speedometer.
    I am kind of accustomed to the gear indicator, I really think all bikes should have them. I also like a tachometer and like to see the rpm.
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  6. #36 Re: Loncin GN250 
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    Sorry, all Suzuki GN/GZ/TU 125/150/250 engines are 2 valve. Some have 2 exhaust ports.
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  7. #37 Re: Loncin GN250 
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    The service manual sections 1-3 and 1-4 has diagrams with four valves, it make it really hard to believe the engine only has two valves when the diagrams in the service manual shows four valves.

    http://www.scribd.com/doc/5321965/GN250-Manual
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  8. #38 Re: Loncin GN250 
    Senior C-Moto Guru MJH's Avatar
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    I went to bike bandits website and looked at the engine diagrams the GZ250 it looks like it is a 4-valve engine, it rocker arms are shapped like a Y, the TU250X has a 2-valve engine with two tappets obviously it would be. They are different engines and for the most do not seem related to the other GS engines, I would say, those are the 125, 150 and 200cc maybe then again the TU is but the GN is different if the GZ and GN models seem to share the same engine.

    http://wonjan.en.ec21.com/GC00861918...igned____.html
    Last edited by MJH; 05-19-2011 at 07:59 PM.
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  9. #39 Re: Loncin GN250 
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    http://wonjan.en.ec21.com/GC00861918...igned____.html


    The service manual I linked to is poorly written or translated, it is 28 years old also. The GN250 does not have tappets, it looks to have a valve cover that has to be removed, but also it has what I would see as access covers instead of tappets?

    I tell you this I am not making anymore assumptions about the engines and the journalists that are propagating websites some for a salary should do the same they are all over the place with specifications.
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  10. #40 Re: Loncin GN250 
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