Will a Yamaha Tri Mo YT175 head/piston/cylinder bolt on a YT125 with no modification?

[pandphomealone2]

I have a 125 that runs good, but it needs the top end refreshed.
I may convert it to a 175.
Is it a simple swap, or is there machine work needed?
Any info/tuning advise would help.
Thank you

[Louis Mielke]

You need the 175 pipe to use the 175 topend but otherwise it will swap the cylinder, head, and piston, no problem.

[Vealmonkey]

The yt175 uses a larger fuel tank. The yt175 uses a vaccuum operated fuel pump. You may want to pick those up as well.

[pandphomealone2]

Thank you for all the info!