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Discussion Starter #1
These are the 2017 Honda Rebel 300 engine specifications listed out along with the tank capacity for those interested.

Bore (MM)
76
Compression Ratio 10.7:1
Cooling Liquid
Displacement in CC 286
Displacement in CI 17.4
Engine Type Single-Cylinder
Starter Electric
Stroke 63
Valve Configuration DOHC

Fuel Tank Capacity 3 Gallons
 

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What most of us here are really after is power and torque numbers and how its being put down, so with that being said, here's the real meat and potatoes of engine specs...

 

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Point proven, CBR300R dyno chart did its job of providing some insight into what the engine is capable of and we can see from what you posted it didn't fall too far off. Not the same as the 300R but close enough.
 

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Discussion Starter #7
It did provide some insight but the differences are shown there, looking at the chart in that very basic form and you can tell it'll be a noticeable difference in power delivery.
 

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It's not that much more and anyone who has really delved into the specs would factor in the weight difference of the two. The only real benefit we have going on here is better off the line power, but with the weight we're working with, that comes to no surprise.
 

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It's not that much more and anyone who has really delved into the specs would factor in the weight difference of the two. The only real benefit we have going on here is better off the line power, but with the weight we're working with, that comes to no surprise.
Not really sure what you are talking about since the Honda Rebel is the heavier bike.
Not to mention weight wouldn't change DYNO results.

What it shows is the Rebel will have a tiny bit more torque at the line, but the minimal difference and increased weight of the rebel will likely negate that.
It also shows a lower horsepower almost across the board and also quite a big drop in peak horse power. Peaking at a lower RPM than the CBR but not having near the top end speed.

To be honest I think there is a reason for this and sadly it isn't a good one. From what I read, the original plan was only going to include a release of the Rebel 500.
The 300 was only added really to fill the need in asian markets and such. And will be sold globally because it would make a good starter bike.

But the thing is the bike design was based on the 500cc engine not the 300. And while they tuned the 300cc in the same way they redid the 500 the results were not the same.

The Rebel 500 has more Horsepower than the CBR until all the way at the top RPM where the CBR has a higher peak horse power.
And the Torque on the Rebel 500 is higher until it gets into the higher rpm range making it much better in city.

So with the Rebel 500 you get a bike that would actually outproduce the CBR500 in the City and actually out produce it on the highway except for top speed.
But with the Rebel 300 you get a bike that likely would not be able to keep up with the CBR300 outside of first gear.

Not that the 300 will be a horrible bike or anything, it will still be fine. But it just clearly seems like its design was just an after thought.
 

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Not really sure what you are talking about since the Honda Rebel is the heavier bike.
Not to mention weight wouldn't change DYNO results.

What it shows is the Rebel will have a tiny bit more torque at the line, but the minimal difference and increased weight of the rebel will likely negate that.
Ok, lets bring some numbers into this...

  • Rebel 300 Weight: 364 (ABS: 370)
  • CBR300R Weight: 357 (ABS: 362)

What is 8 LBS going to negate? :wink2:


Who ever said this is just about dyno numbers? Is that all that matters or overall power delivery on and off the dyno? I don't know about you but also factoring road performance is vital to us as owners. Dyno numbers we only brought in here to get an understanding of the power distribution.
 

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Ok, lets bring some numbers into this...

  • Rebel 300 Weight: 364 (ABS: 370)
  • CBR300R Weight: 357 (ABS: 362)

What is 8 LBS going to negate? :wink2:


Who ever said this is just about dyno numbers? Is that all that matters or overall power delivery on and off the dyno? I don't know about you but also factoring road performance is vital to us as owners. Dyno numbers we only brought in here to get an understanding of the power distribution.
I was going by what looked like you saying the rebel was lighter.
Obviously the Dyno is only a reference point. But most people online already talk down on the CBR300r engine, and this tuning is making it less. But being a cruiser it may be fine. I just think when you compare it to the 500 rebel changes in engine it seems like not as much attention was paid to the 300 rebel.
 

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Discussion Starter #12
Technically this thread was just for engine specs itself. Once the dyno charts came in that kind of threw it towards more of the dyno numbers. The dyno is definitely just a reference point and only plays a part in the overall road performance that's vital for us to know.

BUT if we were looking at overall road performance, this would be a completely different thread.
 

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Well its easy to see why the 300 didn't get as much attention because why should it? Should they just spend more R&D dollars than they should to get similar or slightly better results? Starting off like this is the best way to go, they can always change and adjust as they go. Personally im pleased with the 300
 

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Well there are no dynos on it yet but honda stated it is tuned differently than the cbr300 and they released this.
My local dealer had gotten one 500cc in and it was gone in a blink. But they did get four 300cc bikes in. One of those went out the door quickly as well. I have actually been comparing the 300's engine with the dual sport 250's. Yamaha WR250r's peak hp is 28.07 and the torque is 16.93. The WR is considered the hot shoe dual sport 250. So the 300's numbers (25hp/15tq) are nothing to sneeze at. They are well above the other dual sport 250's. Weight wise the WR is 295lb's vs the Rebel's 365lb's difference is in frame materials tires and fuel capacity.

I am a re entry rider... it has been 30 years since I have owned my own bike. Other bikes I have considered seriously are the TW200, Van van, and the Versys x300. I like the fit and finish of the new Rebel better. 300 or 500 only time will tell.
 
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