[Kiwi Rider]

121 mph (about 195 km/h) is the best I got out of mine at Daytona. It settled at that speed for quite some time and just didn't have enough power to go more. Mine was barely at 11,000 rpm then, if that. Stock engine, just full exhaust and ECU flash, with 39T rear sprocket. That is all from GPS readings, so actual speed, not what the speedo said. But from what I recall the speedo was very close, within about 2 mph of actual speed.

Interesting. In general speedo's in the States reading in MPH seem to be adjusted more accurately than metric models reading in kph. We noticed this with the CBR300's where the metric ones read a very optimistic 10% fast. My Ninja reads 105kph at 100 actual so around 5% fast, hence 10kph out at 200.

 

[ZED]

Top speed with stock gearing (14, 41) at an 11,000 rpm red line equates to a 188.2 kph (116.94 mph) THEORETICAL top speed (according to gearingcommander.com), which means this doesn't factor in resistance from external forces.
At 12,000 rpm it'll be 205.3 kph (127.56 mph), if the bike can pull those revs with the resistance in the real world.

My 400 will be running at the salt flats for "speed week" at the end of the month, with a 15t front and 38t rear sprockets, also bringing a 16t front to test out.
At 16, 38 with a 13,000 rpm red line (what my bike's red line is raised to), the theoretical top speed is 274.3 kph (170.44 mph) which is near impossible to pull, with the given circumstances and limitations of the bike. In this case, with 10% loss at a guess due to this, it brings the top speed down to 246.87 kph (153.39 mph).

On a side note, I'm 6'1 @ 175 lbs.

Although not certain about about the outcome as anything can happen, I'll let you all know after the week at the salt what the bikes GPS and speedo reading are at the top end.

 

[sbk1198]

Top speed with stock gearing (14, 41) at an 11,000 rpm red line equates to a 188.2 kph (116.94 mph) THEORETICAL top speed (according to gearingcommander.com), which means this doesn't factor in resistance from external forces.
At 12,000 rpm it'll be 205.3 kph (127.56 mph), if the bike can pull those revs with the resistance in the real world.

My 400 will be running at the salt flats for "speed week" at the end of the month, with a 15t front and 38t rear sprockets, also bringing a 16t front to test out.
At 16, 38 with a 13,000 rpm red line (what my bike's red line is raised to), the theoretical top speed is 274.3 kph (170.44 mph) which is near impossible to pull, with the given circumstances and limitations of the bike. In this case, with 10% loss at a guess due to this, it brings the top speed down to 246.87 kph (153.39 mph).

On a side note, I'm 6'1 @ 175 lbs.

Although not certain about about the outcome as anything can happen, I'll let you all know after the week at the salt what the bikes GPS and speedo reading are at the top end.

Did you do an engine build on that thing or going in with a relatively stock engine? If stock there's no way that bike will even pull to 10k rpm with a 15/38 combo. With 16/38, forget it lol But if you built it up to be close to 60 hp, it'll be interesting to see what you get out of it.

 

[sbk1198]

This is from the WSS300 race at Aragon last year. Top speed measured (actual speed) was from Schotman at 214.3 km/h (~134 mph). Rules restrict heavy mods on the engine especially for the ninja 400, so I imagine that bike didn't have more than a full exhaust, race air filter, probably a thinner head gasket and degreed cams, with a lot of dyno time which resulted in probably a kickass fuel map. Would be curious to know what gearing he ran in that race.


Also worth mentioning that those kids are basically jockeys, they are very light and a lot more aerodynamic than I will ever be lol That speed was also achieved in someone else's draft (probably a multi-bike draft in fact) and I believe the back straightaway at Aragon also goes downhill a bit.

 

[Roadking100]

lol life is better when your older, I get the same thrill now doing 60 Mph as I did when I was 16 doing 145..

Ditto....I had ONE speed at that age...Flat out or nothing. :devil: Thankfully it was always in a car.
If I had a motorcycle at that age, I wouldn't be here today.:surprise:

 

[The Nimble Ninja]

Hit 130mph once and only once. 125 often and 120 almost everyday.

 

[Kiwi Rider]

Hit 130mph once and only once. 125 often and 120 almost everyday.

130 is impressive. Any down hill or wind assistance?
How stock is your engine? Any gearing changes?

 

[The Nimble Ninja]

Hit 130mph once and only once. 125 often and 120 almost everyday.

130 is impressive. Any down hill or wind assistance?
How stock is your engine? Any gearing changes?

130 on a very short slight decline lb road that is mostly flat. Probably got to 130 because I had been hovering around 125 for a flat stretch than hit a part where it goes slightly downhill. Not exactly down a hill but not a flat part either. 126 on a long flat road. Not sure about the wind direction that day when I hit 130 but I'm sure I couldn't do 130 on a level road. It's fun to try though lol.
Bike is fully stock. Just tucked in as much as possible and wide open throttle. 175 lb. rider.

 

[Roadking100]

I'm guessing this clip is authentic, looks to have been filmed on a Bangkok motorway in Thailand.
195 Kph is pretty impressive, Speedo perhaps reading a little fast as they all do, but it's still fast.
I will do a run with a GPS when I get mine and get an actual reading.

Last time I was in Mexico, my speedo showed 100 mph for a fraction of a second. Didn't see what the tach said. :wink:

 

[Kiwi Rider]

Last time I was in Mexico, my speedo showed 100 mph for a fraction of a second. Didn't see what the tach said. :wink:

Gotta love those border runs huh :grin:

 

[sbk1198]

Gotta love those border runs huh :grin:

Especially from Florida to Mexico...lol

 

[Watcher905]

E-mailed 12 O'clock Labs and inquired about a speedo healer for the N400. Sure enough they should have a release by end of winter to early spring.

Would be ideal for gear ratio changes and true speed reading.

 

[sbk1198]

I thought the 400 has a rear wheel speed sensor, so the reading on the dash is not affected by sprocket changes. Sure didn't seem to affect it any when I changed from a 41T to a 38T to a 39T.

 

[Kiwi Rider]

I thought the 400 has a rear wheel speed sensor, so the reading on the dash is not affected by sprocket changes. Sure didn't seem to affect it any when I changed from a 41T to a 38T to a 39T.

You are correct.

 

[Max400]

Those YT vids are nice and all, but im curious to hear what you guy's top speeds are

 

[L337sponge]

One thing to bear in mind is that we use the RON (Research Octane Number) measuring system for fuel down this part of the world whereas I think in the States you use MON (Motor Research Number or AKI (Anti-knock Index).

So our 91 is roughly equivalent to your 87.

91 is our lowest fuel octane grade and then we jump to 95 and then 98.

It is annoying that this is true.

 

[atomicmonkey]

When I used to work at an airport as a kid, I used to put 100LL Avgas into my Mustang Mach1 and my Ninja 600...really helped get down the closed runway super fast!!!

 

[JFMNINJA400]

One thing to bear in mind is that we use the RON (Research Octane Number) measuring system for fuel down this part of the world whereas I think in the States you use MON (Motor Research Number or AKI (Anti-knock Index).

So our 91 is roughly equivalent to your 87.

91 is our lowest fuel octane grade and then we jump to 95 and then 98.

Just too make things more confusing, the 3 main octanes for sale here in the tri State area (NY,NJ,CT) are 87 regular, 89 mid grade and 93 super. Only Sunoco carries 91. The Sunoco in my area is in a high traffic area and their prices are higher than the other stations. So if I want to try the 91 I will be paying more than I would be for 93. My 400 was dyno tuned on 93. I will try the 91, I am sure the bike will run fine.

 

[sbk1198]

So I'm at Daytona now...so far things are going fine. I totally got confused for some reason on this thread thinking stock front sprocket was a 15, when in fact it's 14T. So last year I ran 14/39 and hit a top speed of 121 mph on the GPS, while being just a bit over 11k rpm, and it wouldn't go anymore no matter what. Today I ran a 14/40 combo and hit 122 mph, while being in the mid 11k range, so still didn't hit the rev limiter even with that. For the record my speedo was showing 123 mph at the time...so stop buying speedo-healers for this bike people!! It's not worth it, it's plenty accurate as it is! lol

With that said, one of the fast kids around here who raced a 400 last year in MotoAmerica and was at Daytona the same weekend I was last year, said he ran 16/41 and with a double draft from two other guys he claims that he got 143 mph. Not sure if that was recorded on a GPS unit or just what he saw on the speedo. Seems extremely optimistic but the point is he was able to make use of that combo without bogging down at a lower RPM, while going much faster.

So all I can conclude from all of this is that aerodynamics is EVERYTHING when it comes to top speed at places like this where you can max out just about any bike. I believe that any little difference in making yourself more aerodynamic helps a lot, especially on these little bikes. Windscreen shape, how big you are, helmet you use, how well you can tuck behind the windscreen, etc.

Another interesting thing that was surprising to me is that I got drafted by a guy on a ninja 300 at the line. His bike has some engine work done to it but nothing crazy, it's still legal in our supersport class rules, and according to the dyno curve, his 300 put out about 42 hp if I recall correctly. He is a smaller and thinner guy...so again...aerodynamics. I may try 14/39 tomorrow again like last year, but anything beyond that would be useless to me and only make be go slower unless I can catch a double draft or something like that.

 

[Kiwi Rider]

So I'm at Daytona now...so far things are going fine. I totally got confused for some reason on this thread thinking stock front sprocket was a 15, when in fact it's 14T.

I'm partly to blame for that. I'm running 14/38, not 15/38.
Interesting to hear about your Daytona runs and thoughts on achieving a good top speed. Sounds like the draft is where it's at. How often do we see this in Moto 3 at the line eh.