Why my 250r isn't faster than your 250r

[Xz1atl]

I seafoamed it and it still wont go 100 mph.. only will go 95 maxed.... n i think it was down hill... im not sure it coulda been though: mad:

[Jiggles]

Originally Posted by Xz1atl

I seafoamed it and it still wont go 100 mph.. only will go 95 maxed.... n i think it was down hill... im not sure it coulda been though: mad:

Try eating salads.

[Xz1atl]

im not heavy at all... it might be my tires

[massacremasses]

youre probably just fat...

haha jk jk


maybe your speedometer is actually semi accurate... hahaha

[Jinx250]

Not that I advise doing so on the street, but if you are going to try a max speed run, you have to top out every gear. And you have to do it on a flat plane. A downward grade is cheating.

[Xz1atl]

Ok but top out up to which revolution?

[choneofakind]

Originally Posted by Jinx250

if you are going to try a max speed run, you have to top out every gear.

Not necessarily, the engine starts falling off the powerband at 13,000 rpm, so as Racer X pointed out, it's actually quicker if you shift at 13,000 and don't waste time waiting for the engine to reach redline. The bike makes peak torque at a lower RPM than it makes peak power anyways, so there's really no need to rev much past peak hp rpm

[Racer x]

What I do is test the engine on the dyno. That tells me the max hp at what RPM. Then I use another formula to determin how much speed can be gotten from that amount of power . Then I select a gear ratio that will put the engine at that rpm. As for shifting you want to shift above the power band. But not to much .

[Xz1atl]

tried it again...only 95(down a slight grade)
i just want to know that every has the same final speed...if not then I need to do something about that

[Skippii]

Originally Posted by Xz1atl

tried it again...only 95(down a slight grade)
i just want to know that every has the same final speed...if not then I need to do something about that

Well, cycleworld...or maybe Motorcyclist...magazine tested the 2008 model when it first came out and got a top speed of 97mph. The same magazine had previously tested the pregen to top out at 101mph.

[Shawn]

I did 105mph indicated multiple times with my pregen, easier then I thought it would with more to go. 80 series sidewall pirellis(95mph rated, why I didn't push it further) and a 2-1 exhaust, that's it..

[Racer x]

Right around 100 mph for the new Ninja. And a little faster for the older ones is how fast I have see them go at Maxton.

[NathanUc]

Break in method could have an apparent effect on your top speed as well.

I don't think you should be concerned with getting around 100mph as a top speed. When I was bone stock, I think mine only hit around 95mph (gps) with me at around 200lbs with gear.

[FrugalNinja250]

An easy way to increase apparent top speed is to install a smaller front tire.

[thisisbenji]

I can only hit about 100 indicated, and I'm only 135 lbs. Not really concerned though because that's about 20 mph faster than I need to go.

[Alex]

Originally Posted by FrugalNinja250

An easy way to increase apparent top speed is to install a smaller front tire.

[EthioKnight]

I've done 110 mph (indicated) on the highway ( I-10, sunday, 4 am) with the bike bone stock. I'm 150lbs (+ 20-10 lbs gear). I apply a pinch of seafoam with every fill up and during my top speed run I was shifting at around 11,000 to 13,000 rpms.
But all that probably means nothing since I didn't use a gps. Maybe it's time for another run...

[CC Cowboy]

Where are the speed limits 95 or over 100mph. I'd like to go that fast but don't want to get a ticket. I'm not a law breaker (although it sounds like fun) and I don't know what I would tell an officer of the law why I would ever be going to fast if I got pulled over. I think they confiscate your bike over a certain speed.

Now on the track is a different story. I would be too worried about about doing 95 or even 100 ( as long as there is ample space to slow after hitting those craze speeds).

Don't you get blown off the bike at anything over 70 or 80? How do you hold on? How can you even see at those speeds?

[Xz1atl]

I really want to believe its because of my tires... here in Ga even the semi trucks go 80 mph (on the slow lane) people out here are crazy, and I dont always try to top out, im fine crusing around 70-80 on the hwy, Honestly though on a daily basis, these people are riding more than 70 on any lane

[Xz1atl]

Don't you get blown off the bike at anything over 70 or 80? How do you hold on? How can you even see at those speeds?[/QUOTE]

No I havent felt like I was going to get blown off, usually im tucked. Its really not much of a difference for me, and its easy to see at those speeds, especially because like I said, most people are traveling around those speeds anyway.

[EthioKnight]

Maintain full tuck while keeping your rear as far back as possible usually gives the best of results. The only problem I have with traveling in such a manner is shifting. Shifting can be a BIG pain in the you-know-where if you have stock rear sets, so I don't fully tuck in during 1-5th gear, but after getting on the 6th, it's tucked in, ass against the rear seat and watch that needle slowly creep past 100!

[coondog]

Originally Posted by Xz1atl

I seafoamed it and it still wont go 100 mph.. only will go 95 maxed.... n i think it was down hill... im not sure it coulda been though: mad:

That's top speed for post-gens with pre-gens around 100. Actually phenomal condidering you're carrying over 30 lbs. extra weight. Without a speedo you wouldn't notice the difference anyway bro, plus it ain't no thing anyway.

[choneofakind]

Originally Posted by Xz1atl

I really want to believe its because of my tires...

dude he's talking about speedo error. smaller sidewall tire = smaller diameter tire = more revolutions = higher indicated speed.

[Xz1atl]

yeah but the bike still has stock with 9k plus miles

[choneofakind]

and that makes a difference on the top speed how?

Still might want to change them. You have an '09. It's 2012. Tires age.

[Xz1atl]

no grip, i just got this bike sept, so i tackling each thing at a time

[Skippii]

Originally Posted by CC Cowboy

Where are the speed limits 95 or over 100mph. I'd like to go that fast but don't want to get a ticket. I'm not a law breaker (although it sounds like fun) and I don't know what I would tell an officer of the law why I would ever be going to fast if I got pulled over. I think they confiscate your bike over a certain speed.

Now on the track is a different story. I would be too worried about about doing 95 or even 100 ( as long as there is ample space to slow after hitting those craze speeds).

Don't you get blown off the bike at anything over 70 or 80? How do you hold on? How can you even see at those speeds?

There was an accident on the Interstate a few years ago, some car got hit changing lanes or something. Big traffic jam as only one lane was open. It must have just happened, I got to the scene about the same time as the cops and ambulances arrived driving up the shoulder. It was close to the top of a hill. Since traffic was backed up, once I got past the incident, the interstate was pretty vacant...and I figured all the cops in the area would be going straight to the accident I'd just passed rather than running radar...
I opened it up going down that hill (about a mile and a half long straight, slight tailwind, full tuck) I hit 118mph indicated (108mph actual). Bike was a 2006 Ninja 250, bone stock.

[Pyro]

Originally Posted by Skippii

There was an accident on the Interstate a few years ago, some car got hit changing lanes or something. Big traffic jam as only one lane was open. It must have just happened, I got to the scene about the same time as the cops and ambulances arrived driving up the shoulder. It was close to the top of a hill. Since traffic was backed up, once I got past the incident, the interstate was pretty vacant...and I figured all the cops in the area would be going straight to the accident I'd just passed rather than running radar...
I opened it up going down that hill (about a mile and a half long straight, slight tailwind, full tuck) I hit 118mph indicated (108mph actual). Bike was a 2006 Ninja 250, bone stock.

If it's anything like our country, the manned camera crews don't attend to accidents while on duty.

[Reddoak]

Originally Posted by CC Cowboy

...Don't you get blown off the bike at anything over 70 or 80? How do you hold on? How can you even see at those speeds?

I've done 105 on a naked bike. It's not that hard to hold on, and the helmet visor goes a long way towards helping you to see. I used to cruise on I-4 on my 250 keeping up with traffic (80MPH or so, 85MPH indicated) and the wind blast was easy to deal with, Just tuck and roll (faster.)

[Racer x]

I hold the record for the fastest naked 250 ninja at 114 mph. The stock fairing is worth about six mph at best. I hope to make a better fairing for 2012.

[muzkur]

My bike goes faster with better gas.
I'm using high octane gasoline because of that.

[Racer x]

Using higher octane fuel is OK when it's pump gas. But over 105 with the the stock compression will hurt power

[DaBlue1]

Originally Posted by Xz1atl

I seafoamed it and it still wont go 100 mph.. only will go 95 maxed.... n i think it was down hill... im not sure it coulda been though: mad:

Just wondering...what rpms are you turning at that speed? Are you still running stock gearing? If so, try a 15t front sprocket.

[Racer x]

16/42 gearing at about 12500 rpm

[Jinx250]

Originally Posted by choneofakind

Not necessarily, the engine starts falling off the powerband at 13,000 rpm, so as Racer X pointed out, it's actually quicker if you shift at 13,000 and don't waste time waiting for the engine to reach redline. The bike makes peak torque at a lower RPM than it makes peak power anyways, so there's really no need to rev much past peak hp rpm

Yes, but there's a difference between "past peak power" and "still pulling". IDK where the peak is for the classic, but my 07 pulls beyond red line.

[choneofakind]

Right, but even though it's still pulling, if you only shift a little past peak power, when you shift, your revs will drop right into or almost at peak power, and you'll get the most acceleration. So it would still be quicker to shift at 12,500 or 13,000 rpm instead of waiting till the rev limiter cuts in at 14,500 rpm.

[Racer x]

At the drag strip you want to shift just past the point where the power curve starts to drop. Waiting past there is no good because it is time spent below max power. When you are timing a bike to 100 th of a second. The time between 12500 and 13500 could be half a second or more in the taller gears.

[CC Cowboy]

Originally Posted by muzkur

My bike goes faster with better gas.
I'm using high octane gasoline because of that.

Is that sugar cane petrol?

[muzkur]

Originally Posted by CC Cowboy

Is that sugar cane petrol?

Not excatly.
Here in Brazil all petrol needs to be 20% sugar cane alcohol.
So, I use what they call premium gasoline.

That have 80% petrol, 20% alcohol and octane additives. That rates 92 to 95 octanes, varies each brand.

[USMCEvan]

I've found I also get my best speeds when in full tuck. I'm about 135lbs and managed about 115mph on a slight downgrade, but 110 on flat ground. 6th gear, pinned throttle, K&N filter, Yoshi slip-on, raised rear suspension, 91 octane.

Could be anything man. Maybe take some time to go through and make sure every part is functioning at peak performance? Clean hoses, carbs, fuel filter, piston o-rings, so on so forth....