Planning some mods this summer, got Yamaha 70 carbs to go on, need to open up the reed block for them too. Got a Mikuni fuel pump to put on as well which is hopefully more reliable than the standard tohatsu one.
Was going to modify the exhaust tuner as well, open it up a bit and cut 25mm off the end. Has anyone else done this? How do you get to the exhaust tuner?

I read online that the flywheel ring gear can be removed so going to look into that. Or if not then maybe lighten the flywheel.

also if anyone knows roughly a big a job it is removing the crank, welding it and putting it back in? how many hours/days, just so I know what to expect.

Cheers