Sprint we understand buying stuff from Os is fraught with danger, maybe put that down as a lesson. I agree somewhat, To my way of thinking any two valve motor that's. a strong runner or rebuilt since 1990 is worth two grand and down form there depending on its condition, what's missing and what bits you need to find to make it work.
I agree its a four k bike. Never said it wasn't , but I'm just saying I think that's its value and it's a fair buy.
The other two valve slider on eBay for seven is over priced by at least a few grand. I would value a normal speedway two valve Slider at 4k and a resto or real clean one at 5. Remember there is not a lot to them after you take out the motor and the frame.... Just saying