How much should I sell this for?

I have a 1991 BMW K75 with around 20k miles that’s just sitting in my garage. It ran great when I parked it, but now it’s having some issues. It starts up but bogs down when you try to rev it. After about 20 minutes of running, it improves, but something’s clearly not right. I also found fuel in the oil, so that’s a nice surprise. I recently became a dad and just don’t have the time to deal with it. Any suggestions on how much to sell it for? I fully intend to disclose this when I officially post it for sale.

I have a 1991 BMW K75 with around 20k miles that’s just sitting in my garage. It ran great when I parked it, but now it’s having some issues. It starts up but bogs down when you try to rev it. After about 20 minutes of running, it improves, but something’s clearly not right. I also found fuel in the oil, so that’s a nice surprise. I recently became a dad and just don’t have the time to deal with it. Any suggestions on how much to sell it for? I fully intend to disclose this when I officially post it for sale.