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Converting A 250 SUPERDREAM TO A 400

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cbradley400/4:
Does anyone know how easy (or difficult) this is please?

I have the chance to buy a 250 with a 400 engine and carbs but am wondering whether I need anything else such as the loom and other electrics?

Athame57:
I remember the CB400n had a halogen headlight that the 250 didn't have, and also twin discs up front too, so plumbing and the front end might be more work than electrics.
Oh, the clocks were different too.  8)

Bryanj:
I know the generators were different but not sure about the cdi boxes, check part numbers

McCabe-Thiele (Ted):
There are two UK Superdream sites, this has been covered or you can ask.

They have downloadable parts books and manuals like here.

McCabe-Thiele (Ted):
Different number of connections for the CDI box.
Different drive sprockets.

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