[MeeLee]

Anyone got me beat? ran 103mph one night running on a smooth tollway with the wind, frequent slight declines on the highway

I weigh about 158-160pounds, removed quite abit of weight from my bike, yoshi rear fender, no passenger foot pegs, rear seat delete, coffmans exhaust and k&n air filter. 93octane still debating a fuel controller, think my mpg has took a hit, but im not complaing

hmm a 500r only reaches 109mph?

He ran on a smooth troll way

 

[MeeLee]

What's the top speed of your Rebel then MeeLee?? :laugh:

Now it's tuned for fuel efficiency, and probably doesn't go above 87MPH on a good day (feet on passenger pegs, and ducked forward).
I hardly take it out at anything above 82MPH anymore.


But yeah, get the rebel revving at 6600RPM top speed, and you'll surpass 87MPH easily; or, sit upright, feet on pegs, and go only 82MPH...

 

[MeeLee]

It appears to me, if my calculations are done correct,
basing myself on this graph:

That the CB300F has peak HP at around 8500RPM,
This is the sweet spot for reaching top speed.
Current top speeds I've seen are done at between 10 and 10.5k rpm, where the engine makes just short of 2HP less power then at 8500RPM.
It's not a lot, of increase, but every bit can help.

From what I've seen from youtube videos so far, is that the CBR300R seems to be able to top 100MPH, while the CB300F's best youtube video top speed seems to be only 87MPH.
The CBR rider did lean forward, the CBF rider sat upright.

Presuming both bikes can do 95MPH when leaning forward, to gain most top speed you'd have to change the sprockets from a 14/36t, to a 15/34t.
Suppose that the CB300F could only reach up to 90MPH, with the mod, it should be able to reach 95.
If it did 95MPH stock, it might even come close to 100MPH.

Coincidentally the largest front, and smallest rear sprocket, is also the setup for highest top speed.

If the bike could do 100MPH stock, like the CBR300R, you would have been best off with a 15/32 setup, or a 16/34t should such a thing fit in the bike (for reasons of maintaining top speed, not acceleration).

Me personally, I prefer to have one gear above the gear that the bike can maintain it's top speed.

If the CB300F needs to rev around 3k RPM minimum to maintain speed, and most of my traveling is at >35MPH,
For me the best sprocket setup would be a 15/29t, which allows me to maintain 40MPH speed in 6th (at 3k RPM), and top speed in 5th; if they only had a rear wheel that would fit the sprocket.

My Riding style is relax, and based on economy riding; not fast acceleration... just saying...

 

[MeeLee]

Yeah, and please clock your speedo with a GPS as well.
Just download a GPS app in your phone, and throw it in a pocket while having it record your speed.

 

[MeeLee]

Most GPS apps do.

 

[MeeLee]

Hey Kiwi,
Have you tested top speed ducked forward, and sitting upright on this bike?
You mentioned going about 102mph (probably ducked), how much would it go sitting upright (to get more of a feel for the CB300F's top speed).

 

[MeeLee]

Snugged

 

[MeeLee]

That's how I ride now on my Rebel, to maintain 85+mph speeds. Not comfy for more than 30 minutes.
I've heard the grom does 60mph stock?
Most people wanting to ride top speed on the grom, go 1 tooth up on the front.

 

[MeeLee]

Well, perhaps you guys are more honest, than the asians.

 

[MeeLee]

144 is disapointing.
I don't get why the F goes about as fast as my Rebel (only 5kph faster), while having such huge torque and HP increase over it. The rebel only has 16hp and goes 85 mph (136kph) .

If I where you, Ravinoth, I would put a 15t on the bike. It will bring your bike closer to the powerband, gain a HP or two, thus your top speed should increase a bit. It should also correct some of the offset between gps and speedo, and unless your odo is on the dot correct, also give you more accurate MPG readouts.

 

[MeeLee]

It is a bit disappointing. For my needs I felt that the 300F came really **** close to being "enough bike" (ie. screw the haters); but not even being able to hit 100 mph (160 kph) felt pretty lame to me so I actually traded my 300F in for a 500F and it's pretty much exactly what I was looking for. Its top speed is around 188 kph which isn't a huge jump considering the jump in CC's but that's enough for me (for now haha).

I really liked keeping the bike below 400LBS.
I have an (unused) Suzuki GS500F. It's 485LBS, and I find it a pain to roll around in the yard; as well as safety wise, to me I feel less safe on it.

I was eying the CB500X a few months back,
Liked the seating position, and all, but the price, and weight kind of turned me off; since I wanted a replacement for the GS500F. The 500F came second at 425LBS, and seems like a good candidate, but I find the FZ-07 a better one for the price.
They say Honda's valve adjustment (a $300-500 job) on the CB500's is every 16k miles.
On the FZ-07 it appears to be every 25k miles, so you'd end up saving on maintenance in the long run...

 

[MeeLee]

I wished I could say it's cheap.
$4k, + dest fee + dealer fee + taxes often comes out above $5k. For that price you can buy a second hand car here FL.

I just bought a larger tank for my Rebel, and a larger rear sprocket from current, for better top speed.
Give it 2 months time to see how it rides, and sell it around tax day (March to April).

 

[MeeLee]

Reminds me of the VT750's.
On the interstate, they would vibrate my butt off at 5k rpm, almost like a bull with steel horns was ramming the underside of my seat a 1000 times per second...

One of the cylinders was aimed at my privates, and I always thought what would happen if the piston would shoot out, I would have an instant tranny conversion (and a big hole where there was none before).

But the bike always handled the speeds good upto 108MPH (speedo only went to 100MPH), despite the heavy vibrations.

 

[MeeLee]

6'4", ~190LBS 2015 CBR300R yellow (which is faster because of it's sporty yellow line, and no other reason)

Indicated: 90MPH sitting upright, 99MPH tucked.
GPS: 80MPH upright, and 90MPH tucked.

The problem with the F and the R is that the speedo in many cases is 10% overreading.

So if above is true as well, then the F is 10MPH slower.

A sprocket swap to 15T front, and 35 or 34t rear, should give you one or two more MPH, and an open exhaust (slipon) should add a bit more on that.

 

[MeeLee]

On the other hand, lots of traffic means you can draft behind cars, and go faster.

I would agree with motomike, if you're on 80MPH roads, you need to go a guaranteed 90MPH (with a headwind);
That means your bike needs to go 100MPH GPS the least as top speed.
That's 500cc, or more, territory
The CBR30R will hit 90MPH GPS on a good day, 80MPH on a bad one.

 

[MeeLee]

I win the under-nourished baby competition at a slip of a 130lbs fully dressed and breakfasted.
That's how I get better top speeds out of my bike than MeeLee :devil:

We yet have to see,

Although my fat 180LBS ass seems to slide quite well through the air at 9500+RPM sixth gear.

I never took the opportunity to take my GPS out to see how fast I really was going.
The speedo mentions 93-94 MPH, but the sprocket setup makes 13.4% more speed than stock indicated.

An I ain't even running my Danmoto exhaust yet!
I was surprised how good the danmoto muffles any incoming sound.
It's a good thing to mount on a spouses mouth, in case they tend to yell hard! :laugh:

Bike is at the dealer now, for the fuel issue to be fixed in warranty.

 

[MeeLee]

My recordings were on a straight, flat 4 lane motorway road and no speed cameras. You automatically get a years ban at 100mph by the fuzz. 6 points at 90mph +. 3 points at 80mph+ and big fines.

What sprocket setup are you running? Stock?

 

[MeeLee]

You need oil in your gas tank, and install those mirrors upside down!
Also, I heard that changing your windshield to a smoked one, will gain HP.
And don't forget to lubricate your blinkers for aerodynamic flow. Regular butter will do!

 

[MeeLee]

Yeah..When I was younger ...(late 20's) I layed on the gas tank (GSXR 750) + opened the throttle to 220 KPH (140 MPH) and backed off. I never did that again. I figure I was pretty lucky to get away with it..

Since then, she's gotten a bigger smile, and her first taste of bug splatter, and flying critters

I've taken mine to about 95 on the speedo with stock exhaust.
There's a 13% difference due to gearing, so with stock gearing it should have shown 107MPH.
It's a little optimistic the speedo.

Currently, I'm topping out at 90, until I can get my fuel issues resolved (air/fuel ratio back on stoic).

 

[MeeLee]

I finally was able to clock my GPS on the cbr300.
It seems with the new gear ratio, it underread by 13%, which means that the stock CBR speedo was dead on.
On the cbr I've done 107MPH with the Danmoto exhaust, but at one point with the stock exhaust I must've done 112MPH (GPS). That was with a tailwind.

On my GS500F, I did 112MPH regularly. It has 33-35bhp, and in power very similar to the cbr, only more power from 8k rpm on, tjough the heavier weight causes it to accelerate the same.

On my VT750 I've managed to get 108mph.
Funny how that 55hp bike couldn't go faster than the cbr.
Anything over 90mph doesn't feel well to me.
For that reason I'd love to one day own a sub 400lbs 4stroke naked bike with around 400cc and 40hp.
The big perfect 4.
Probably twin cylinder too. At 40bhp twin has enough power down low, where a single might have too much torque for city riding for me.