Harry Beddows

Hi Everyone, Hope you are all well and thankyou for looking at this topic. Right my yamaha DT125LC engine is not starting and we have stripped down the carb and blown it all out and we also looked at the top bit where the piston is and it all looks ok yesterday we replace the piston rings but no different and looks like it may need a rebore and just wondered what sort of price it would cost or anything that could be causing this not to start there is ab good spark would really really appreciate your advise . Thanks for looking , Harry.