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.
Printable View
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.
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.
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.
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.
http://www.xbhp.com/talkies/attachme...oy_top_450.jpg
The TU is vanilla for me.
http://pictures.topspeed.com/IMG/cro...250_460x0w.jpg
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.
Sorry, all Suzuki GN/GZ/TU 125/150/250 engines are 2 valve. Some have 2 exhaust ports.
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
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
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.
TU250X 249cc 14KW @7500 rpm
Single cylinder 2-valve EFI
Legal in 49 States
GZ250 249cc 14.7KW @8000 rpm
Single cylinder 4-valve Carbureted
Legal in 50 States
I think that is interesting that the carbureted GZ250 can meet CARB and the EFI TU250X does not.
I am not a GZ250 fan, but I am now considering it for modification since it seems to have a good engine.
I wonder if I could customize it, they sell for $2,999.00 brand new, even less used.
Others seem to have done just that….
http://farm4.static.flickr.com/3285/...9aed3da0ec.jpg
http://farm4.static.flickr.com/3251/...28e7158089.jpg
You never catch me wearing those goggles….
here is image of the GZ250 engine and you can see around the decorative cover.
http://image.motorcyclecruiser.com/f..._view.jpeg.jpg
http://i2kdave.files.wordpress.com/2...pg?w=528&h=397
how to adjust valves on a GZ250....see the bolt its an adjustment bolt for the Y shaped rocker arm that has two valves attached to it.
GZ250 head
http://i784.photobucket.com/albums/y...i/untitled.jpg
http://i784.photobucket.com/albums/y.../untitled2.jpg
Look at this little custom with a 125cc...
http://i784.photobucket.com/albums/y...photovd019.jpg
here is a mock up
http://i784.photobucket.com/albums/y...cafemockup.jpg
another version of the GN250
http://i784.photobucket.com/albums/y...i/vol001_0.jpg
There seems to be two different engines one is a 2-valve and the other a 4-valve and the twin exhaust port seems to go along with that. Close examination of the engine head shows either the access cover (4-valve) or a single tappet bolt (2-valve). 2-valve with single exhaust port http://i784.photobucket.com/albums/y...i/top_img2.jpg 4-valve with two exhaust ports http://i784.photobucket.com/albums/y...009tr250-5.jpg
I just wonder if Wonjan cannot sell its GN250 in china or the 250GY either then will they be discontinued or only exported.
I left these small and they are click-able to view in full size…also they can be zoomed into.
WJ250GY
http://i784.photobucket.com/albums/y...jan/th_250.jpg
GN250
http://i784.photobucket.com/albums/y...ser-GN250-.jpg
If they could be had for cheap they would make good bikes to customize, lowering the front on them and raising the rear and then cleaning them up? Wonjan says they do not sell the engine only that it can only be purchased on one of their models. You just know that there is no way Suzuki would allow anyone to sell that GN250 with its name on it…not unless they are distributing them.
After seeing what Ryca did with the SV40...it makes me wonder why somebody does not set up a more elaborate system of customization? Then why not through a bigger network like Suzuki of America?
Stock bikes sitting next to custom versions of them, with kits or individual parts for sale and even the option to have them do the conversion for you and even to your used model?
I wonder what a unit price on these is out of the factory?
Rumor in chinese site say it's in govt C3 catalog. The REAL bike will sold in May/June & < 16k RMB. :popcorn:Quote:
Originally Posted by MJH
A taobao shop that sold many "goodies" for these bike
http://wj-gn250.taobao.com/
Thank YOU :icon10:
That is a very good page to have access to...
:lol8:
Some crazy idea to repair this 250 machine http://motorcycle.sh.cn/viewthread.p...d=75082&page=1
Very crazy I was not surprised at the ending.
I am not a metallurgist but seems that the era of copper and bronze came before the era of steel…that man made a repair with brass which is an alloy of the two and has a low melting point. The history of metal should have been considered and why…something to do with fires and being able to get them hot enough to melt iron hotter then what they were using to melt copper and bronze. LOL
Brass...easy to work with...yeah its soft.
Effort = A
Knowledge behind effort = F
Almost ALL white chinese bike (w letter J in official model) have similar issue. Pigs don't really care oil level etc at ALL because it isn't their property :mwink:Quote:
Originally Posted by MJH
:lol8: Those "sleeve" is made by another shop in prevouis repair, that crazy guy only "imporve" the desgin & "fixed" cam chain / took the f***ed bolt out.
I wondered if it was a police bike…I am sure it had lots of miles on it before they retired it.
Loncin saw the 2010 initial response of its version of the BMW G650GS as less then positive.
http://i784.photobucket.com/albums/y...0GS-static.jpg
http://i784.photobucket.com/albums/y...1110534557.jpg
What did Loncin miss in the interaction with BMW engineers? Is it that form should follow function? Loncin believed that the shared engine would inspire confidence, but it may have been over shadowed by their exercise in creative design?
The bike looks high tech, underneath it all is a BMW engine that Loncin manufacture for BMW.
But does it fit in the existing Loncin product line, does it fit into the existing distribution channels? It actually over shot the market that Loncin actually operates within.
Who are their clients and what are they current offerings? It is over their market, the retail side of the giant is actually in reality small independent retailers. Those small dealers cannot afford or support that model.
Imagine a sales representative entering a store that offers primarily low costs scooters and announcing the new offering? Then also would the customer for that style motorcycle feel confident purchasing it at that level of retail?
A great design exercise, but also an exercise in futility.