Blown up 400, what's needed to use 650 engine?

[frost2540]

Hi people i need help i have blowen up my sv400 99 and want to replace it with a 650 one what else will i need to change for it to work and it to be legal

Thanks for the help
craig:D

[jambo]

Ola!
Well, a 650 engine should go straight in (99-02 for ease of wiring). You'd want a 650 ignition unit, as the rev-limiter on the 400 is set higher and could cause extra stress on the 650 motor.

To make it equivalent to a 650 you'd want that 2nd brake disc at the front but I wouldn't worry too much :)

Jambo

[yorkie_chris]

The casings should fit in. Think the stators and wiring swap fine.

Not sure about carbs. Maybe you'll need those from 650 too but no idea.

[frost2540]

thanks for the help guys when you say ignition unit do you mean the coils ?

[jambo]

Nope, the item that sends the pulse to the coils, you'll often see it listed as a CDI unit, though the SV doesn't use CDI technology, which is somewhat old-school now.

Jambo

[frost2540]

oh ok i see now thanks

[davepreston]

if i were you id buy a crashed curvy for cheap and transpher your bits over, otherwise you'll be paying custom insurance

[northwind]

That's good advice that. Any engine swap becomes a hassle but a bigger engine can be a sod to insure even when it's basically just an SV650. May well work out uneconomic.

You might be able to sell the "cdi" to an optimistic tuner btw, as jambo says it'll run a 650 motor but it raises the rev limit. Which is good, unless it all explodes itself, when it becomes less good :D