[Racer x]

First off there is a vast world of land speed racing . Only on the east coast do they seperate two stroke and four stroke engines. So records with the ECTA or LTA will say 250-4 or 250-2.I won't address the two stroke records. But they are 150+- mph

This is how the 250-4 world stacks up. At least the mile racing.
Number one is Moto madcap Honda . Wizards of nitrous system. On altered class. At Maxton 131mph.

Darkhorse racing modified nitrous ninja 250 123

RNR cycles Ninja 250 nitrous is 122

Then team Mullholland at 119 with nitrous.

The top speeds without nitrous are all 112.

These are all partial streamline records.
I don't know the naked or just modified record speeds. But I can update them later.