GN250 top speed

[ducatilover]

I don't mean really trying to hot it up that much, but I'm sure there's a lot of work you could do to smooth out the ports and chamber (if the outside of the motor is anything to go off I can't imagine what the inside of the ports look like). Maybe a little skim of the head, heat wrap the pipes to keep the gases hot and moving. The primaries are a nice bend but where they join isn't particually flash.

Supercharge.....

[RDjase]

I had a GN400 years ago, how many of them were around? From memory it went pretty good, i swaped a car and got some cash and the GN(in the early 90s), it had these stupid 6 bender bars and the front master cylinder not connect due to the hose being to short lol, I put some low bars and used it for a work bike for 6 months,
Cant remember how fast it went, I had a Trident at the same time, so th GN wasnt the weekend rider

[ducatilover]

I had a GN400 years ago, how many of them were around? From memory it went pretty good, i swaped a car and got some cash and the GN(in the early 90s), it had these stupid 6 bender bars and the front master cylinder not connect due to the hose being to short lol, I put some low bars and used it for a work bike for 6 months,
Cant remember how fast it went, I had a Trident at the same time, so th GN wasnt the weekend rider

The older pre-chinese assembly gn series had a very good reputation. I don't think the 400 would be anywhere near as good as the trident....

[cheesemethod]

Can you repower a GN250 with the 400 motor, IE are they the same frame?

[ducatilover]

Can you repower a GN250 with the 400 motor, IE are they the same frame?

Go for a drz400 donk.

[RDjase]

Can you repower a GN250 with the 400 motor, IE are they the same frame?

cant remember, it was a long time ago, i will have to google it and see what they look like, they mite be a bigger frame, wheels ect, like the SRX yamahas, 400 and 600 are the same frame and the 250s are totaly differerent bikes

[ferrari_chris]

I've had my GN up to a max of 125km/h. That was wide open in 5th down a steep hill. It wasn't very long though, so I could have gone much faster if there wasn't a corner 200m away.

I haven't done a proper top speed test in "speed mode" though.

On the straights (and a windless day) it's capable of 100-110km/h without any hassles.

...

I find 110km/h on the flat is no problem, but as soon as you add wind or a slight incline you are at full throttle watching the speedo drop. Fun little bikes, but not good on the ego when you're on long straights. Overtaking on one forms good habits though - you have to think ahead, get in the right gear at the right speed before the overtaking lane starts and you can usually squeeze past most slowpokes.

Absolutely. On a recent trip to Te Kuiti I was wide-open in fourth to hold 95km/h up a couple of the steep hills. I feel sorry for my mate on his ZX10R that rides with me. He can do that in 1st! Haha