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Discussion Starter #1
What has changed EXACTLY?

I'd like to see a list of everything that has changed between the CBR250 and CBR300
 

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Discussion Starter #2
well since noone answered i tried to look up more info

The CBR 300 R is a bigger CBR 250 R. The length of the CBR 300 R is 2035 mm, width is 720mm and height is 1120mm. When we compare it to the CBR 250 R, the length is increased by 3 mm, width is same and height decreased by 7mm. Honda has made the CBR 300 R lighter than the CBR 250 R. Honda CBR 300 R weights 164 Kgm which is 6 kgm lighter than the CBR 250 R. Honda has increased the wheelbase of CBR 300 by 13mm. The wheelbase of CBR 300 R is 1380mm. The ground clearance of both CBR 300 R and CBR 250 R is the same which is 145mm. Honda has given same wheels for the CBR 300 R from the CBR 250 R. 110/70-17M/C for the front and 140/70-17M/C at the rear.
Now the big part of the story which is the engine. The Honda CBR 300 R is powered by a 286 cc DOHC 4 valve single cylinder fuel injected engine which makes 30.4 BHP of power at 8500 RPM and torque of 27 NM at 7250 RPM. From CBR 250 R, Honda has increased the power by 5.4 BHP and torque by 4 NM. This engine is mated to 6 speed gear transmission. Honda has given disc brakes at front and rear. Honda is giving the ABS as an option.
In design Honda has completely changed the front of the CBR 300 R. The front headlamps and visor design is inspired from higher CBR models. Compared to CBR 250 R this is far more aggressive and edgy. The rest of the panels have given a minor tweak. The instrument cluster and the handlebar are also same from the CBR 250 R. Overall, the CBR 300 R is a tweaked version of the CBR 250 R. We can expect the Honda CBR 300 R next year in India.
 

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The CBR300R is not bigger than the CBR250R... you'll want to recheck your facts.
 

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too bad the CC's couldn't be closer to 300 but rather in the 280 range
Honda could have produced an engine closer to 300cc, however that would have also required increasing the bore, which in turn would have required a new larger cylinder and piston & ring set, thereby increasing the manufacturing costs of the engine. So to increase the 250R engine's stroke by 8mm, Honda only had to move the crankshaft throw by 4mm and shorten the connecting rod length by 4mm in order to increase displacement by 36cc. Which then means all of the other 250cc engine parts & components will remain unchanged for the 286cc motor.
 

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Honda could have produced an engine closer to 300cc, however that would have also required increasing the bore, which in turn would have required a new larger cylinder and piston & ring set, thereby increasing the manufacturing costs of the engine. So to increase the 250R engine's stroke by 8mm, Honda only had to move the crankshaft throw by 4mm and shorten the connecting rod length by 4mm in order to increase displacement by 36cc. Which then means all of the other 250cc engine parts & components will remain unchanged for the 286cc motor.
Thanks for breaking it down.
Although the costs to produce the new engine would skyrocket it would still be a great investment, this will after all be a long-term bike, also one of their top selling bikes too. It would eventually pay off financially and with their rep in the industry.
 
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