400cc twins will be on the pace easily... A friend built a parallel twin 500cc for karting for his Masters and hot 115hp out of it. Then there's the other factor that the 4 will be easier to ride with a silly flat girly power delivery the 250's stamd no hope.

Fontyyy I think that had there been any top established riders left on 500's at the time they wouldn't have had it so easy... Just look back to Jacque and Barros (both not 'top' class IMHO) at whatever race it was that they took each other out while leading and Katoh at Jerez in 2002, who was all over Rossi apart from straight bits when he lost about a mile!

It's always glossed over by the press unfortunatley that the diesels have TWICE the capacity. They carry on like their comparing like for like. The 4's aren't twice as fast... And no one talks of tyres. I mean, a 500 on the rubber used now, designed specifically for a 500 would no doubt be 4 seconds faster than it was at the same track it last raced at when they were still around. Don't forget Jezza manhandled the Proton V3 around Philip Island about a second faster than an NSR if my terrible memory serves me correctly So it's reasonable to conclude than an update 500 on 2005 tyres would be pretty quick. Not Diesel quick, but not 5 seconds slower.
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NSR300R - Why did i ever have a 250...