1 - issues with naza blade 250
- feel heavy
- rough engine
- the back cylinder prone to overheating issue
* oil cooled V engine common prob

2 - CBR250 single
- better torque than ninja250
- easier to ride in town

3 - ninja250
- twin cylinder
- reliable n proven engine
- old tech engine

4 - megelli - no comment

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maintanance wise
all about the same unless major parts needed to be change