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Current fz-07 and gsxr 750 owner here who just picked up a used 300r for cheap thrills. I took this baby on the highway today and was only able to achieve a top speed of 84-85 mph. I'm 112 lbs and to my understanding should be able to get a bit above 90. I had the throttle pinned for a couple seconds before traffic made me more cautious.

I know I know, I was not expecting a super bike out of the 300cc thumper but I'm concerned. The dealer confirmed that it had stock sprockets on it so gearing has not been changed. They recommended redlining in 5th then changing to 6th to get more momentum.

To those who have tested the limits of this bike. How long after a WFO throttle did it take you to reach your top speed? What was it? Were you in full tuck going downhill with tail wind?

Can you cruise above 80 comfortably?
 

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I've hit the rev limiter in 6th, 103mph indicated. That was full tuck down a hill. I regularly hit 98-99mph on flat ground, also full tuck. I'm about 10 pounds heavier than you. Not sure how long it takes to get there, not terribly long. It will cruise comfortably at 80mph though it does sound a little high strung.
 

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Current fz-07 and gsxr 750 owner here who just picked up a used 300r for cheap thrills. I took this baby on the highway today and was only able to achieve a top speed of 84-85 mph. I'm 112 lbs and to my understanding should be able to get a bit above 90. I had the throttle pinned for a couple seconds before traffic made me more cautious.

I know I know, I was not expecting a super bike out of the 300cc thumper but I'm concerned. The dealer confirmed that it had stock sprockets on it so gearing has not been changed. They recommended redlining in 5th then changing to 6th to get more momentum.

To those who have tested the limits of this bike. How long after a WFO throttle did it take you to reach your top speed? What was it? Were you in full tuck going downhill with tail wind?

Can you cruise above 80 comfortably?

I say consider yourself lucky. It sounds like you have a 300 like mine where the speedometer is dead nuts accurate. My bike struggles to get to 85 mph on flat roads un-tucked. However, I have verified via GPS that the 85 I do achieve is right on the money. Since I have read a lot of posts on this forum about speedometers that read 10 and 11% high I believe we are in the proverbial "roundhouse" for these bikes.


Tom
 

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Just look at the tacho. In reasonable conditions, you should be able to get close to the rev limiter in 6th (I've never bothered to try but others say it's possible). If you're way under in terms of rpm, there's an issue.
 
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I say consider yourself lucky. It sounds like you have a 300 like mine where the speedometer is dead nuts accurate. My bike struggles to get to 85 mph on flat roads un-tucked. However, I have verified via GPS that the 85 I do achieve is right on the money. Since I have read a lot of posts on this forum about speedometers that read 10 and 11% high I believe we are in the proverbial "roundhouse" for these bikes.


Tom
Mine is verified via GPS also. I have run the GPS every time I change sprockets(4 times) to adjust my speedohealer. I test it at 50 and 75mph
 

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Mine is verified via GPS also. I have run the GPS every time I change sprockets(4 times) to adjust my speedohealer. I test it at 50 and 75mph

I have read virtually all of your posts and respect your opinion since you have worlds more experience on these bikes than I do. Having said that............. :D I need my drivers license for my job so my top speed is measured by what I can achieve in a relatively short/reasonable amount of time. I have never rode it to the rev limiter in each gear trying to soak every little ounce speed out of it. 85 is my functional top speed.



Tom
 

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I have read virtually all of your posts and respect your opinion since you have worlds more experience on these bikes than I do. Having said that............. :D I need my drivers license for my job so my top speed is measured by what I can achieve in a relatively short/reasonable amount of time. I have never rode it to the rev limiter in each gear trying to soak every little ounce speed out of it. 85 is my functional top speed.



Tom
I have taken it to the limiter in every gear. I love it when I'm at the mid point of a turn and throttle it and the limiter starts going as I come out of the turn lol
 

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With your feather weight you should easily crack the ton barrier.
First check that you have stock gearing then as JNO pointed out check that it is revving out.
Mine goes straight up to 150kmh at 9000rpm up right,then slower to 162kmh still up right.
There is nothing to be gained by taking each gear to the red line,5th and 6th are very close.
Change up between 8500 and 9000rpm for maximum acceleration with a stock engine and gearing.
The only time to take the engine past 9000rpm is in top gear during high speed runs.
Also note that these small bikes will lose a lot of top speed going into a head wind,even a slight 15kmh head wind.
 

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I found a cure for the perception that the CBR300 has a slow top end. I bought a CRF230L a couple of days ago and I can assure you that it's top end makes the CBR feel like a CBR1000 when it comes to top speed. Make no mistake. BOTH bikes will get me more speeding tickets than I can afford. If you are looking for a high top speed, don't expect to find it in a 286cc production single. If you are looking for great looks in an economical, low-priced, easy to ride, easy to maintain, and, most of all, FUN ride, then look no further than the CBR300R.
 

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In my dreams the speedo touched an indicated 158km/h which reading these forums is probably closer to 142km/h actual. The speedo was still crawling upwards but I ran out of road so backed off.

I'm still familiarising myself with the bike and I didn't want to risk doing anything silly. Felt stable and safe at speed though. Was lent down but didn't particularly tuck in hard or anything like that. If I'd tucked in properly with a bit more road I'm guessing that an indicated 165km/h would have been easily achievable - about 92 mph actual.
 

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In my dreams the speedo touched an indicated 158km/h which reading these forums is probably closer to 142km/h actual. The speedo was still crawling upwards but I ran out of road so backed off.

I'm still familiarising myself with the bike and I didn't want to risk doing anything silly. Felt stable and safe at speed though. Was lent down but didn't particularly tuck in hard or anything like that. If I'd tucked in properly with a bit more road I'm guessing that an indicated 165km/h would have been easily achievable - about 92 mph actual.
I got an actual 164 outta mine but I was wrapped around the fuel tank like a coat of paint with elbows, toes and my breath tucked right in. :D

Where abouts in Otago are you?
 

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I got an actual 164 outta mine but I was wrapped around the fuel tank like a coat of paint with elbows, toes and my breath tucked right in. :D

Where abouts in Otago are you?

Indeed! But as I understand it you put both yourself and your bike on a strict performance dieting regime and I surely don't have the discipline for that!!! :D


Because of the nature of the interwebs I don't want to be too specific but that little run was done not far from Waihola.
 

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I saw this today, this guy splitting lanes at over 90 mph (145 km). Reckless driving in my opinion. Go to the 11 minute mark of video (11:00)

 

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On my way to work, I have some Kilometers on German Autobahn with no speed limit. Accelleration to 140km/h (88mph) is pretty straight. Leaning a little down and waiting gives 150 km/h (94mph). Everything beyond takes additional effort: Down as much as possible and waiting. After a long time, you may reach 160km/h (100mph). Doing this is as difficult as getting a super sport to 300km/h - the traffic. On fast bikes, I must look for slow cars suddenly change lanes. On slow bikes, fast cars force you to the right lane with the slow traffic. 15T sprocket did not improve (GPS speed measurement). The bike doen't have enough power to get the 6th gear to the limit on even roads. Replacing exhaust was not a good idea: Top speed decreased about 10km/h (did the test on same day on same road).
However, the bike is fast enough for country roads.
 

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Accelleration to 140km/h (88mph) is pretty straight. Leaning a little down and waiting gives 150 km/h (94mph).
The CBR does accelerate up to an actual 135-140km/h quite promptly. But you are right, after that progress does noticeably slow. The bike does keep speeding up after 140km/h but in its own leisurely way, and not at a rate useful to perform any manuevers with.

Currently I haven't been faster than an indicated 158km/h (~144km/h actual) and I neither had the time or the road in front of me to keep trying for faster.

Here in NZ the max speed limit is 100km/h so the bike is perfect for working around that. It can do it but it's certainly not that suited for spending a lot of time over 140km/h.
 

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Current fz-07 and gsxr 750 owner here who just picked up a used 300r for cheap thrills. I took this baby on the highway today and was only able to achieve a top speed of 84-85 mph. I'm 112 lbs and to my understanding should be able to get a bit above 90. I had the throttle pinned for a couple seconds before traffic made me more cautious.

I know I know, I was not expecting a super bike out of the 300cc thumper but I'm concerned. The dealer confirmed that it had stock sprockets on it so gearing has not been changed. They recommended redlining in 5th then changing to 6th to get more momentum.

To those who have tested the limits of this bike. How long after a WFO throttle did it take you to reach your top speed? What was it? Were you in full tuck going downhill with tail wind?

Can you cruise above 80 comfortably?
I get 97-98 flat tucked... I've hit the rev limiter at 102 with a slight incline... Deff cruise comfy at 80 ... But like to stay at 70 75 if i do ride hwy... Im 140lbs ... It's a 2015 ... I've heard alot of ppl with the newer models say they can only get 80ish.. Even been told that it has a governor that stops it from reaching 90+... All n all love my 300 ... I deff keep up on the backroads with 600s
 
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