GN250 - 300cc upgrade?

[SS90]

But, there is NO compressor?? Apart from a sound wave!

That is correct.

That allows for a super charging "effect", but does not "super charge"

No more than a forced air air box super charges.

[jake47]

dont you have any friends in England to ask? you're not related to Skidmark are you?

Yep loads of friends thanks but none with any knowlege of suzuki gn 250's .But thats not surprising as there arnt too many of them over here but i believe they where still made for the NZ market until recently? and there are a lots more on the road.
btw never heard of skidmark.

[Lucy]

the rest of a new gn is chinese built anyway

I'm pretty sure a '92 will be Japanese made.

[jasonu]

You are wasting your time and money

[Sable]

You are wasting your time and money

In a big way.

[SS90]

Don't take it the wrong way Jason, because this is not intended as a personal insult, I know how much work would go into your bucket, but erm, aren't you asking 5K for yours?

The same could be spent purchasing a 95 RS125, and at the end of the day, your bucket will never handle as good as an RS125 (even an early one)......... SOME would say 5K on a bucket is a waste of money, personally I would never spend 5K on a bucket, but it is a bit rich to say this dude is "wasting his time and money", would his money be better spent on your 5K bucket?, (which , by the way will never be a match for an old RS125 framed bucket), I think the guy should go for it.........

[jake47]

Don't take it the wrong way Jason, because this is not intended as a personal insult, I know how much work would go into your bucket, but erm, aren't you asking 5K for yours?

The same could be spent purchasing a 95 RS125, and at the end of the day, your bucket will never handle as good as an RS125 (even an early one)......... SOME would say 5K on a bucket is a waste of money, personally I would never spend 5K on a bucket, but it is a bit rich to say this dude is "wasting his time and money", would his money be better spent on your 5K bucket?, (which , by the way will never be a match for an old RS125 framed bucket), I think the guy should go for it.........

Thanks ss90 well it seems to have gone in ok and no probs with the timing or carbs, as ime taking it gently at the moment its early days .So fingers crossed and i will keep you all posted.

[gorgonzola]

Hi community.

If someone is looking for gn250/TU250 parts look here:
gn250_taobao_com. Taobao is the daughter company of alibaba_com.
There are ignition coils, carburetors, CDIs, mechanical parts
Prices are in Yuan.

Gn125 is GS125 there.

You can search with gn250 as a search word. There are two GN250
shops but one seller doesn't communicate in english.

Seller is Xietoo. He is able to communicate in english.
If someone is interested I give you his email.
Some of his parts are SGP parts from japan.
I just ordered the mitsubishi ignition coil from him.
This is the origional Gn250 Japan ignition coil.
It is the same coil as on my 1989 gn250.


Taobao is the chinese domestic C2C platform. The language is chinese.
Eventually you need the simsun font to be able to display
the website.

Chinese GN300ccm cylinder upgrade set:
item_taobao_com/item.htm?id=7017406180

Including shipping costs to europe approx. 120€.
Weight is 4Kg including packaging.

Manufacturer of the GN250/WJ250GY is wonjan motors
www_wonjan_cn
If my memory serves me well the GN250 factory was sold in 2000 from Japan to China.
Wonjan manufactures 1.5 million bikes each year.

Someone here wrote:
"I understand (and someone will be sure to correct me if I'm wrong) that you can tell by a quick glance if your GN is made in China - the Japanese ones have spoked wheels and the Chinese ones have those alloy-type wheels."

I think it is wrong. I own two versions spoked wheels and aluminum wheels and they both are made in japan I think. So the chinese Gn250 should start around the year 2000.

Wonjan has changed the website. This information was there.
But I can ask xietoo. His Hobby is: GN250

The Gn300ccm upgrade works. The chinese guys recommend a different carburetor from Keihin. There are 2 ptk carburetors from www_ptk_cn or com , one is more for the GN250
and the other is more for the GN300 version but you can use the 300ccm cylinder with the
origional mikuni bs34ss carburetor.

Ptk is the chinese daughter company of the japanese carburetor manufacturer teikei.
There are new ones starting from 280yuan.

But I agree the 300ccm upgrade is almost a waste of resources.
At least one guy with a sidecar GN250 model tried it.


I think a GS500E is a better option or anything else if you want more power.



Regards.
gorgonzola