[Mikeee P]

No disrespect but you're not going to take this 25hp motor and turn 40hp with it. That's a 60% increase in hp and not just realistic unfortunately.

The Ninja 250s 2007 and previous were making approx 27-29hp and with pipes, jetting, K&N or pods, and high compression pistons, none of those bikes were making more than 33-35hp. And that ons a twin cylinder that's already starting with more power than the CBR250.

The CB250 engine despite its decent design, is going to reach it's normally aspirated limits somewhere around 30hp and that will be a healthy increase that will be really felt as singles develop such good torque.

Just to give you an idea the CRF230 engine totally modified out by a Factory Honda Racer (former) at 251cc, high compression piston, porting, high perf camshaft, larger valves, exhaust and everything imaginable is just breaking 30hp I believe Mike is claiming around 32hp for a single cyl 250 that's amazing! He's spent prob 5 years developing this engine...

You could possibly see 40hp if you were running alcohol, with all the other mods, and super high compression ie: 14:1 or higher with the timing adjusted appropriately - and we're not talking pump gas alcohol we're talking cart racing methanol that burns twice as much as pump gas, giant jets, wide open only... which would be good for the Maxton Mile to try and set a 250cc record for single cylinder four stroke...

Great little engines they just aren't made for peak power they are made to be torquey...

Mike

 

[Mikeee P]

As a follow up to show no disrespect is meant, Honda's most technological 250 at this time (production) is the CRF250R motocross engine and they are making approx 35 rear wheel hp depending upon the year and the dyno. The top engines ported, piped, (carb engines make more power) are making at the most right at about 40hp fully modified.

So as you can see, the top of the line MX engines right now in 250cc configuration are making just under or just over 40hp with full on every mod available... Their porting and design is far beyond what can be achieved with the CBR unfortunately - now if we could just stuff a CRF250 engine into one of these CBRs, and throw a 280cc Athena big bore kit on it... *grin*

Mike

 

[Mikeee P]

Lee I think these little bikes are more giggle per cc than the bigger bikes! I mean screaming around town makes you feel like you're road racing just when you're headed up to Circle K for a loaf of bread! *grin*

I'm a fanatic about the 250 bikes as well. Love the 250cc Ninja and was headed for a land speed record when someone went far beyond my bank account so that pretty much put an end to that - though I'm tempted to see what rules they have at Maxton to see if I can still pull something off.

The CBR250 being a single is quite exciting. Until now the most exciting 250cc engines I can think of are the XR motors, and actually the performance that the companies built for the XR200 might surpass the XR250 performance. Roller bearing cams, or cams in bronze bushings etc, etc... so this new valve train which is actually an old valve train which was proven on the CRF250 is exciting. It puts new possibilities into the 250cc single class...

One thing that's awesome about big singles is the amount of "thump" you get out of them. Just got done building a 680cc XR650 that is totally tricked out - it's a rocket for a big single and more fun than should be allowed on the street.

I'm dying to play with the CBR250 more than just the test rides from working at a Honda dealership. After having played so much with Ninja 250s I see some quick/easy performance upgrades for this little rocket which is exciting...

Mike