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Old 09-17-2003, 07:38 AM   #11
ducatirdr
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Default 450 dirtbike Ya right.... It's going into an RS250 and coming to the states

With each passing year we see the extinction of two stroke engines. From Moto GP to dirt, marine to snow, everywhere two strokes are being replaced with super light-weight 4 stroke power plants.



I've always lusted over a small razor sharp bike like an Aprilia RS250 that the lucky ducks overseas get to play on. Now Aprilia just released info on a 4 stroke v twin about the size of the RS250 v-twin.... Are they thinking what I'm thinking??? I hope so...



Let's get a count going. Who wants an RS250 sized bike with a 4 stroke motor in it that feels like a 2 stroke? I would put my money down now. That bike would be a pisser.
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Old 09-17-2003, 08:16 AM   #12
cybris
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Default Re: New Mille Nera, 450cc Dirtbike from Aprilia Announced

What about Honda's uni cam engine. The 250 engine weighs 52 lbs.
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Old 09-17-2003, 10:39 AM   #13
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Default Re: New Mille Nera, 450cc Dirtbike from Aprilia Announced

How is an SOHC motor new? They've been around in dirtbikes for 30 years.
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Old 09-17-2003, 11:27 AM   #14
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Default Re: New Mille Nera, 450cc Dirtbike from Aprilia Announced

Because it is on the intake side not in the center. It uses a "fork" design to operate the exhaust side. It works like a DOHC but with only one cam making the engine lighter and more compact.
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Old 09-17-2003, 01:52 PM   #15
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Default Re: New Mille Nera, 450cc Dirtbike from Aprilia Announced

Absolutely, a supermotard. Maybe a baby Buell?
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Old 09-17-2003, 01:54 PM   #16
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Default Re: 450 dirtbike Ya right.... It's going into an RS250 and coming to the states

As a former owner of an ahem "grey market" RS 250 streetbike, I agree that this engine would be awesome, in an RS-250 chassis. Similiar weight and power, with much better low-end torque, etc...



BUT The RS-250 uses a motor that is designed for daily street use and I'm guessing that this new 45 V.2 is a "race" motor which would probably not stand up very well to daily street usage. I assume (there I go again) that the oil capacity is probably miniscule and that the transmission uses ultra tiny and lightweight internals that are not well suited to the rigors of street-life. I hope I'm incorrect.
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Old 09-17-2003, 01:54 PM   #17
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Default Re: New Mille Nera, 450cc Dirtbike from Aprilia Announced

Yes, but does it work better than a DOHC?
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Old 09-17-2003, 02:07 PM   #18
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Default Re: Seriously

1996 isn't exactly new. And the jury's still out on whether or not this is actually better than a steel frame for MX bikes.
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Old 09-17-2003, 02:17 PM   #19
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Default Re: New Mille Nera, 450cc Dirtbike from Aprilia Announced

Me too
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Old 09-17-2003, 06:39 PM   #20
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Default Re: Killer Supermoto!

Supermotard is what this twin has to be all about. Bring 'em on!!!
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