Of course it's possible to sell it privately but how many people would hand over 10K+ for a bike and then walk away trusting the seller would actually pay off the finance ? Not me thats for sure. A month later theres a knock at the door and the bailiffs take it away as the seller pissed the money up the wall and didn't settle the pcp finance. Happens quite often in the car world. I'm not saying you would do that as I know you but other people don't.
The dealer will work out how much you still owe on your pcp, then work out how much you bikes worth in Glasses guide and subtract that from the bikes value. You are likely to still owe them money. Once you settle that up you will be starting from zero to get the new 800 so you'll need a deposit to get it on pcp.........I'd save a bit more and get a bank loan, pcp is for mugs. Hope you make the correct choice though Stuart.
You make some great points, I've had career in financial services, PCP is not for mugs! It's definitely not always the best thing to do, there are times when you can get incredible deals! Example, oil crash in Aberdeen, hundreds of Audi cars, BMW cars handed back to the dealer. Owners stating, lost my job, see you in court if you have to! These cars were sold off with huge discounts on new price, low apr's on PCP deals! I have one of these cars!!