Hello are the Bandit CDIs interchangeable, will a 600 fit a 400, and does VTEC engine make a difference (my guess is the advance curve is slightly different

I doubt that they are interchangeable mate, even less chance with the vv ones.

Hello thank you for your response, the one I have here is not the VTEC engine, Paul @ Wrentham Bike Shed is telling me the same thing though, different advance curves is most probable, if anyone has tried it please let us know!

I would be surprised if a 600 cdi would fit, even pre and post 1993 are different on the 400.
The VVC is totally having a single 12 pin connector, the cdi runs TPS and an oil pump for the VVC.

Thanks for your response, also had an owner of the VTEC confirm what you have said today, hope I can find one soon