Loncin GN250

**MJH** · 05-19-2011, 10:16 PM

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….

You never catch me wearing those goggles….

**MJH** · 05-19-2011, 10:25 PM

here is image of the GZ250 engine and you can see around the decorative cover.

**MJH** · 05-19-2011, 10:38 PM

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

**MJH** · 05-20-2011, 12:48 PM

Look at this little custom with a 125cc...

**MJH** · 05-20-2011, 12:50 PM

here is a mock up

**MJH** · 05-20-2011, 12:55 PM

another version of the GN250

**MJH** · 05-20-2011, 01:00 PM

**MJH** · 05-20-2011, 01:43 PM

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

4-valve with two exhaust ports

**MJH** · 05-20-2011, 09:21 PM

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

GN250

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?