Don't sell the bike.
You've (will) spend so many time and money into it, and than just selling it? NO.
You'll never get the same money as you've payed and spend into it.
If you want to covert your TW to 200 cc or more, than please take a look on this link:
You have to change everything from the crank shaft to the top.
For the carb you have 2 options:
- Convert your DE05 CV carb setup to the TW225 setup
-->> I can deliver all needed parts.
- Install my 28mm Mikuni flatside carb kit.
-->> I recommend it, but it's more expensive as option 1.
These conversions are a bit expensive.
You can buy it from me, but you have to spend round about 1200 EUR into the parts. But after this conversion you will have a nearly new engine.
If you search for a better priced option (500 EUR), than you can choose my 165 cc kit with 28mm Mikuni flatside carb.