GN250 Cafe Racer

**highace10** · 19th February 2013, 22:00

Thought i would drop in and post a pic of my GN that is still in the works.

Still have a few things to do...main ones being:

Somehow changing the fork oil to a higher weight. Hopefully stiffen things up a bit

and get the damn thing going, especially after ive cut out the airbox. CV Carbs and pods dont mix apparently.

Ace

**ducatilover** · 19th February 2013, 22:10

CVs and pods aren't great but I had mine running on a foam pod and it was fine. I've got a standard airbox with a brand new OEM filter here in a box somewhere

Very neat looking GN, good to see another with wires!

**highace10** · 19th February 2013, 22:14

Ive been doing a bit of reading about the CV pod thing...not a lot of good info out there. Going a foam pod or using the K&N pod helps things a bit.

The wires are looking great...thats why i bought the 92..

Rejetting should be fun...

Any idea on how to take the top cap of the forks? It looks like it has a small keyway for a special tool...i have no idea

**ducatilover** · 19th February 2013, 22:21

http://dl.dropbox.com/u/26633588/GN250%20Manual.pdf here's my copy of the owners manual
Can't remember un doing the fork caps on my last GN, but I think they have a circlip just above the cap?

Tuning it is piss easy mate. I just shimmed the needle and had a 134, or 136 jet in it, ran fine on a high comp 300cc motor

**highace10** · 19th February 2013, 22:32

I dont rememebr a circlip..hmmm

It looks like a cap with a small round indent at the top with a small key way section...

Know of any place to get jets for the carby? I only have a 140 and 145 main jet. Mind you i dont have the stock exhaust anymore.

Cheers

Ill take a pic of the fork tops tomorrow if that helps

**ducatilover** · 19th February 2013, 22:43

eBay. Buy mikuni or factory pro numbered jets, Keihin and Dynojet will fit but use different numbering

I have a GN in my garage, so I can have a look at the forks (mine are in need of a rebuild anyway)
Here's my little toy if you're interested http://www.customfighters.com/forums...16#post1217516

**highace10** · 20th February 2013, 10:26

Ebay does seem to be the way to go for jets. I'll probably pick up a few and see how it goes.

Nice GN. Tanks looks cool, what's it off?

**ducatilover** · 20th February 2013, 10:36

Cheers, it's a GS450 tank, needs the extra capacity, I don't think a standard tank will last long with that motor, plus the standard tank looks gay

It looks like you just drive the cap out with that little keyway on the forks.
I'm going to design a preload adjuster for mine, just because I can.

**highace10** · 20th February 2013, 11:03

I thought I recognised the tank.

It's an odd setup that key way.. There must some special tool?

After some reading ill probably shim the springs and try some heavier weight oil.

**ducatilover** · 20th February 2013, 11:11

I did them on my old GN and I'm pretty sure I used a flat blade screw driver and hammer to tap it around

Don't go too far with spacers because the srings will bind under compression.
They take 10w oil as factory, much heavier makes the damping action slow and weird

**highace10** · 20th February 2013, 19:22

I thought the same thing, flat blade screwie and a hammer but its a mighty small key way...

Ive read shimming up to an inch or so should be fine...I guess ill have to see when to finally get the thing going.

**ducatilover** · 20th February 2013, 19:42

My old one had 20mm shim and 15w fluid, still handled like a heap of shit
The only way to make it handle is brace the frame, put new forks and shocks on and brace the swing arm

Or put a DR600 motor in it and leave it stock