SOHC.co.uk Forums > SOHC Singles & Twins

Converting A 250 SUPERDREAM TO A 400

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BigAl (Alan):
The main wire harness part No. 32100-443-000 fits both models. There is also a rear lighting sub-loom, part No. 32200-443-000 that  also fits both models.

cbradley400/4:
Thank you to all repliers : that is all most helpful :)

McCabe-Thiele (Ted):
My Superdream is the 400NA model, lots of later changes to the front suspension & twin brake calipers. Also some of the later Reverse Comstar wheels don't fit earlier models iirc.

cbradley400/4:
Another point has occurred to me and I wonder if anyone can answer this please?

The V5 has the 250 frame number as the vin but still the 250 engine number.

I know the frame number cannot be changed and must remain with the registration number but how easy is it to change the engine number if the engine is changed to a 400?

My understanding is the bike has not yet been registered as a historic vehicle so assuming you can change the engine to the 400, the additional road tax would have to be paid to put the bike on the road and of course it would also need to be MOT'd and insured.

cbradley400/4:

--- Quote from: McCabe-Thiele (Ted) on September 07, 2025, 07:36:48 PM ---My Superdream is the 400NA model, lots of later changes to the front suspension & twin brake calipers. Also some of the later Reverse Comstar wheels don't fit earlier models iirc.

--- End quote ---

Yes thanks, I seem to recall those changes back in the day when the bikes were current.

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