GN250 top speed

[owner]

I test rode a GN250 and was not sure if it was running correctly seemed a bit flat like the jetting was wrong
Whats the top speed on these mean machines???

[xwhatsit]

Maybe a genuine 110-120kph -- 130kph under exceptional circumstances (wind or drafting, downhill etc.).

[owner]

HMMMNN, thanks the one I rode was about right then

[Bikernereid]

HMMMNN, thanks the one I rode was about right then


Me thinks me new bike may need some fine tuning!

[Bren]

my top speed was about 140 down the methven straight with a backwind...

but 130 is about tops if ya squat down a bit

[NOWOOL]

Yeah, it should do at least 127 on the flat without wind help.

[R6_kid]

I had a 2005 built one maxing out at 110kmh flat tack, i've had a 1980's built one to 130kmh+

[Thani-B]

Ive had mine at 130kmh going downhill. Cruises fairly happily at 110 though.

[nallac]

just slightly faster than walking......


the only one i've ridden showed 130k's on the speedo, sounded like it was going to explode...

[Maha]

just slightly faster than walking......


the only one i've ridden showed 130k's on the speedo, sounded like it was going to explode...

Yip mine did about that speed, tested it once I had sold it on the straights just after Ruakaka....taking it to its new owner, passing a milk tanker...140 I think rung out!

[ducatilover]

I had a 2005 built one maxing out at 110kmh flat tack, i've had a 1980's built one to 130kmh+

I had my 04 model to 125ish on the flat after about five years of holding it open, and managed a drafting best of around 135. :yawn:

[kiwifruit]

fast enough.

[ducatilover]

fast enough.

nope. ;) I think not. Can't safely pass slower moving vehicles. :wacko:

[kiwifruit]

nope.

you're mad

[ducatilover]

you're mad

More retarded than mad, I do like to pass other people, it extends my penis and my homies think I am the shizznit :yes:

[Laxi]

More retarded than mad, I do like to pass other people, it extends my penis and my homies think I am the shizznit :yes:

haha, not mad, just plain fucking crazy:laugh: but does keep us all entertained

[ducatilover]

haha, not mad, just plain fucking crazy:laugh: but does keep us all entertained

Glad to be of service:yes::woohoo:

[dblancer]

I thought I read somewhere that is dangerous to try move too quick on a GN 250

as at the revs and the strain placed on the motor, the valve springs start to wear and eventually let go?

I cant find a source for that right now however.
could just be the chinese ones?

[Bikernereid]

I know it goes over 90km but can't tell you how:nono:

[Bow-Down]

I only got a 2005 one to 115kph downhill and lying on the tank

[Bikernereid]

I only got a 2005 one to 115kph downhill and lying on the tank

Noone behind pushing your bike down that hill?

[Choco]

142km/hr on a very long flat road, little wind on a stock GN250 with the carb tuned, sitting on the pillion seat with my head on the tank.
Thats 2nd place, 1st is Banzai with another 5km/hr or so but he changed the sprockets and putting a screen on his (he's also a skinny fella).

So you COULD loose your license on the open road on a GN 250 :D

[Bikernereid]

142km/hr on a very long flat road, little wind on a stock GN250 with the carb tuned, sitting on the pillion seat with my head on the tank.
Thats 2nd place, 1st is Banzai with another 5km/hr or so but he changed the sprockets and putting a screen on his (he's also a skinny fella).

So you COULD loose your license on the open road on a GN 250 :D

Think that it will be a long time before I even think about going near those speeds!!

[Choco]

Think that it will be a long time before I even think about going near those speeds!!

I think it will be a long time before you reach them too! Takes about 5 mins with the throttle pinned to get close :rofl:

The GN isnt designed to go that fast though, it's still a GREAT bike though and i still miss mine every now and then. :yes:

Ride safe now!

[Bikernereid]

I think it will be a long time before you reach them too! Takes about 5 mins with the throttle pinned to get close :rofl:

The GN isnt designed to go that fast though, it's still a GREAT bike though and i still miss mine every now and then. :yes:

Ride safe now!

I am a little nana and will be responsibly staying like that for quite some time!!!

[Lissa]

I had a GN250 for about 3 months, got sick of it. Its a good first bike, you really cannot do anything wrong on it. I would have to say, that the top speed for me was 90-100kms and if I was going down hill, I got to about 120kms. Infact the only time I really got excited on it was when the baffle fell off (and it was new bike) it sounded kinda cooler... for a GN. Couldnt pass cars on it though, all they had to do was speed up alittle and then I was ferked.

[Mom]

I had a GN250 for about 3 months, got sick of it. Its a good first bike, you really cannot do anything wrong on it. I would have to say, that the top speed for me was 90-100kms and if I was going down hill, I got to about 120kms. Infact the only time I really got excited on it was when the baffle fell off (and it was new bike) it sounded kinda cooler... for a GN. Couldnt pass cars on it though, all they had to do was speed up alittle and then I was ferked.

Man you needed to really ring the snot out of it then Lissa :)

I managed to overtake a bus :yes: a bus. Mind it took about 500 metres to do it, but I managed :D

Yeah the trusty GN is not a speed demon for sure, even chopping down a gear or 2 doesn't help that much, just seems like the engine is going to explode!

However, it is a really reliable commuter bike, and a great learner machine. You wont get in trouble on it (unless you still have those plastic OEM tyres and ride in the wet) and it is a perfect choice for a learner that needs to build confidence.

[Lissa]

I did ring the snot out of it, but my bandit is way better (160 top speed, but am sure it can do better)

But yea, the plastic tyres which mine had arent good, best to change them. As a learner bike I agree its a good confidence booster.

[Choco]

even chopping down a gear or 2 doesn't help that much, just seems like the engine is going to explode!


huh? Drop a gear? No more RPM to go until redline! :pinch:
All this talk about GN's make me miss mine :( i did 12,000km or so on it in 6 months! rode it to Cape Reianga, Taranaki, Rotorua and Gisborne on tours with my mates! sure you arrive a bit later, but you spend barely anything on fuel!

[Lissa]

huh? Drop a gear? No more RPM to go until redline! :pinch:
All this talk about GN's make me miss mine :( i did 12,000km or so on it in 6 months! rode it to Cape Reianga, Taranaki, Rotorua and Gisborne on tours with my mates! sure you arrive a bit later, but you spend barely anything on fuel!
I got told by a certain male KBer that GNs were chick magnets! :rolleyes: (Think he was drunk at the time). Well it certainly wasnt a stud magnet, infact I was largely ignored lol.

[Choco]

I got told by a certain male KBer that GNs were chick magnets! :rolleyes: (Think he was drunk at the time). Well it certainly wasnt a stud magnet, infact I was largely ignored lol.

I picked up a chick with my GN :cool:
You just need to get the right gear and lower your voice, works wonders.


Also, tinted visors make people think your 'deep and mysterious', Honest.

[ducatilover]

I got told by a certain male KBer that GNs were chick magnets! :rolleyes: (Think he was drunk at the time). Well it certainly wasnt a stud magnet, infact I was largely ignored lol.

I never got any chicks or studs on my gn. Mind you chicks and studs love to laugh at my little beast I have now....:second:

[Bikernereid]

I think it will be a long time before you reach them too! Takes about 5 mins with the throttle pinned to get close :rofl:

The GN isnt designed to go that fast though, it's still a GREAT bike though and i still miss mine every now and then. :yes:

Ride safe now!

120km and the bike could have gone a wee bit faster if the snoozer in the car in front didn't keep slowing down. Now the chain has been fixed the OWNER recons Ermintrude is a new bike!!

[FROSTY]

Hmm could make for a bit of fun. GN250 speed trials.
Wonder what the mechanical limitations of the gearing would be?

[svr]

Actual top speed I'd say is < 110 clicks as you can go past a cop with a radar whilst being `flat on the tank' so to speak (on the way to last years cold kiwi). Its a weird feeling. Even weirder is that only 2 bikes passed me on the way, one of which I got back on the access road in.
As gutless as the engine is, I really wouldnt want any more power with that chassis...

[Fumph]

It's a great bike to learn on I've had mine for 12 months and have done 6000 kms on it. Just got my full license today so the GN did a good job.
Have had it up to 125 kph twice on the flat with a little tail wind, and regularly to about 118 kph. I have even over taken other bikers.... I bet they felt real sick when they realised what had just passed them! Time to buy a bigger bike now though..........

[Cheshire Cat]

It's a great bike to learn on I've had mine for 12 months and have done 6000 kms on it. Just got my full license today so the GN did a good job.
Have had it up to 125 kph twice on the flat with a little tail wind, and regularly to about 118 kph. I have even over taken other bikers.... I bet they felt real sick when they realised what had just passed them! Time to buy a bigger bike now though..........

Already?!
what ya gonna get?

[Cheshire Cat]

I got told by a certain male KBer that GNs were chick magnets! :rolleyes: (Think he was drunk at the time). Well it certainly wasnt a stud magnet, infact I was largely ignored lol.

Yea....Dumb chicks :laugh:

[joshy28]

Come to think of it, i mis my GN..had her up to 127ish kph (on the straights) on the way to Rotorua, however averaging about 90 all the way.. It was a bit hard heading up hills but on the way down, choice!!

Drove my GN 4 months almost everyday.. Had her to Rotorua and back twice and i regularly basis, travelled to Hams.... Anyway
I loved the GN for its "keep on keeping on attitude" however, i dont miss the raw power it had lol.

[Fumph]

Already got it, but it's having work done on it presently. Have gone for a Jap Classic CX500 from 1978!!!! It's in gr8 condx, but have to wait until Tuesday next week.........The GN will be up for sale 2007 with 8500kms and a 6 month old set of Pirelli City Demons.

[ChainReaction]

Wow thats SLOW!. I used to ride an old Honda 150cc GL it did 130KM top speed on flat land with no wind. And I thought it was just that slow because of the small engine.... now your telling me 250cc motorbikes are even slower?

[ducatilover]

Wow thats SLOW!. I used to ride an old Honda 150cc GL it did 130KM top speed on flat land with no wind. And I thought it was just that slow because of the small engine.... now your telling me 250cc motorbikes are even slower?

No, just that the gn250 is a dirty pile of poo

[Jonno.]

wow. How much does the gn weigh? My 150 can go 135km..

[ducatilover]

wow. How much does the gn weigh? My 150 can go 135km..

It weighs f**k all. But 17hp and aerodynamics of a tissue box equals a slow top speed. 135km? That's the highest claim I have heard for an fxr150, good effort:rockon: 135km is near the end of 4th on my slower than a paraplegic running spada...:scooter:

[ChainReaction]

No, just that the gn250 is a dirty pile of poo

Sorry for off topic.

Whats your spada go like? I'm looking for a bike at the moment.

[ducatilover]

Sorry for off topic.

Whats your spada go like? I'm looking for a bike at the moment.

Goes good for a 250 twin. Sounds like a beast too. :rockon:

[Indiana_Jones]

Top speed of a GN250?

How long is a piece of string?

-Indy

[ducatilover]

Top speed of a GN250?

How long is a piece of string?

-Indy

Double half it's length :drool:

[xwhatsit]

I can never quite work out bike top speeds. Take two bikes with almost identical weight and horsepower and the speed it can attain often varies wildly. Anyway, does weight matter in top speed? I don't think weight figures into the equation at all, it's only relevant in acceleration?

I figure it must be something to do with aerodynamics. Despite what they look like and what intuition might suggest, motorcycles are actually terribly unaerodynamic. Most bikes get nowhere near the sort of drag coefficients your average Jap sedan has. Naked bikes are particularly rubbish of course, and that might have something to do with it; perhaps a GN with its tall forks has a lot of swirling and confused air around in front of the engine. Who knows.

I mean look at the original Speed Twin. 27bhp; my RS when new made 26bhp. Nonetheless the Speed Twin comes close to cracking 100mph (not quite there though). RS never got close to that. Of course different ways of measuring power figures come into play but it's roughly correct.

[ducatilover]

I figure it must be something to do with aerodynamics.

The nail just got hit there mate. The main disadvantage of a motorcycle is the c.d, your typical garden variety porsche 911 has a c.d of around .29, versus a hayabusbusbus which for a botormike is rather slippery at around .7 from memory.

[Dare]

The nail just got hit there mate. The main disadvantage of a motorcycle is the c.d, your typical garden variety porsche 911 has a c.d of around .29, versus a hayabusbusbus which for a botormike is rather slippery at around .7 from memory.

I imagine the least aerodynamic part of a motorbike is usually the guy sitting on it..
Wonder if more aerodynamic gear would help or just make riding harder?

[xwhatsit]

I imagine the least aerodynamic part of a motorbike is usually the guy sitting on it..
Wonder if more aerodynamic gear would help or just make riding harder?
There's definitely a difference on my gutless piece of shit between wearing loose flappy PVC wets and an open-face compared with zip-together leathers and a full-face -- maybe 10kph+ at the top end.

[Karl08]

130 -wind assisted

[cheesemethod]

I managed over 135 going down a hill on mine. This was on a dry day with no wind on a nice clean piece of asphelt - and I still wouldn't recommend trying this. I really don't think the frame and suspention are designed for high speed, bike feels a little numb past 120.

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.

[ready4whatever]

140km p/h tops

[cheesemethod]

140km p/h tops
Sounds about right, IIRC mine hits the bottom of the redline 130ish, so 140 would be abusing it but still achievable.

I assume GNs don't have rev limiters?

[ducatilover]

Sounds about right, IIRC mine hits the bottom of the redline 130ish, so 140 would be abusing it but still achievable.

I assume GNs don't have rev limiters?

140? Down a hill, flat on the tank, tail wind, slip stream. It's cheating. They are basically useless :devil2:

[cheesemethod]

I'd love to have the time and money to blueprint and balance a GN motor and add an exhaust. Would be interesting to see if getting rid of the flaws of mass production would make much of a difference.

[ducatilover]

I'd love to have the time and money to blueprint and balance a GN motor and add an exhaust. Would be interesting to see if getting rid of the flaws of mass production would make much of a difference.

It's still air cooled though, less ability to expel heat from combustion obviously, which means for reliability [not like our race car] you have to run less aggressive cam profiles [acceleration/deceleration faces, not duration] and have smaller valves. That's the flaws with air cooling, you are relying on airflow, the oil and air fuel mixture entering the combustion chamber to cool it.
I reckon you could get a reliable 30hp from one though.
The old briggs & Stratton power junior dragster made 40hp, very peaky and running on methanol. Wouldn't use it as a engine for any other purpose:(

By all means, win lotto and do a gn up!

[cheesemethod]

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.

[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:brick:, 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:banana:

[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:brick:, 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:banana:

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....:drool:

[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