Oooh dear, diesel questions...hopefully I can click submit before Andy clicks "lock thread".
An RVF400 will flat out destroy any NSR150 or CBR250, it will give a "normal" NSR250 a decent race as well.

But on the other hand you'll get mocked openly for having a big fat diesel.

Sshhhh....I've got one
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Please do not PM me technical questions, if you can't find it on the Forum start a thread