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Been doing a little web searching and found that Aprilia is getting these sort of numbers on the Rotax 998 cc engine:

The RSV Mille and limited-edition RSV Mille Factory are high performance V-Twin powered motorcycles made by Aprilia with a 143 HP 998 cc engine built by the Austrian company Rotax.

http://www.apriliausa.com/

139HP:

http://www.apriliausa.com/modelli/road/techinfo.asp?id=116

143HP:

http://www.apriliausa.com/modelli/road/techinfo.asp?id=108

http://www.apriliausa.com/modelli/road/techinfo.asp?id=107
 

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engines

Been doing a little web searching and found that Aprilia is getting these sort of numbers on the Rotax 998 cc engine:

The RSV Mille and limited-edition RSV Mille Factory are high performance V-Twin powered motorcycles made by Aprilia with a 143 HP 998 cc engine built by the Austrian company Rotax.

Welcome to the Aprilia USA official site

139HP:

http://www.apriliausa.com/modelli/road/techinfo.asp?id=116

143HP:

http://www.apriliausa.com/modelli/road/techinfo.asp?id=108

http://www.apriliausa.com/modelli/road/techinfo.asp?id=107
Would one of these Aprilia motors bolt into a Spyder?:rolleyes:
 

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Yes they should. Been told this is exactly the same engine. With 50hp more and 6 shifts. We miss the 6th shift because of the reverse.
But then you do not have nanny and think you have also problems with the rest of the electronic.
 

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With the added weight of the spyder vs the Aprilla , stroking the engine producing more torque would give better results than searching for pure HP . Torque is usually overrated in the motorcycling world but in this case its the way to go .
 

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So does anyone know the differences between our motor and the aprilia version? cams? pistons? or totally different major components?

I plan to do the aerocharger on mine very soon, but why not figure this out? then put the aerocharger on top of a 140hp n/a setup (assuming the compression isn't anything crazy to make the extra power)
 

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I've got to agree with Jake; increasing the stroke will put more torque on the table... I think that's what these rides could use.
(Although 50 more horsepower is almost NEVER a bad thing!):D



 

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Well it does make perfect sense... Just fool the motor into thinking that it's a bunch colder outside, and it'll richen up the mix. I've noticed that every year with my truck; 18.5 mpg in the Summer, and 16.5 in the Winter... (NOT that I ever took the time to epxeriment with what that extra fuel was doing to the horsepoiwer that was available!:eek:)



 
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