Pre-96 were not restricted but not all were full powere with YPVS.

After that they become a nightmare to derestrict.

But if you are "tuning it to the max" what difference will the year make.

Ultimately they all run very similar engines.

The newer ones are by far the easiest to derestrict.

But again you will want to at some point get an aftermarket CDI.

These bikes can't be tuned to the standards of the Aprilia RS engines, they simply were never designed that way, but can be tuned to give a noticeable amount of power.

Welcome to the forum

I look forward to seeing what it is you end up buying/doing.

Not how I'd do it. Replace the item, it's cheap enough new from Yamaha.

Ultimately if that part starts to weep, you're going to run your bike lean, and before you know it, you'll burn a hole through your piston, as well as your wallet.

And people wonder why DT's can be in right dog states.

Spark Plug looks fine mate.

I didn't think it was fueling.

A plug chop must be done at high RPM WOT and the ignition to be switch off and clutch pulled in then bike pushed home

You don't get any sort of idea of how the engine is performing whilst pootling around. However you do see if there are any problems.

That is lovely! Can you get some better resolution images

So if this were a four stroke engine I'd be like yeah, break her in.

But sorry, piston and rings is simply maintenance on two strokes.

I would bed the rings in to the new bore, or give the bottom end a good run in (which you haven't built so no need). I'd do the rings and piston in 10k miles.

@irongamer727 The bowl is adjusted by the float valve. Why would taking the main jet out affect the float valve.

@nottsbiker As @AndyYam used to say, the competition WR had those same bottles. They wouldn't restrict a competition bike.

@tdrnoob That should pick up a lot quicker than that.

This needs investigating for sure.

If it's running lean, then the plug will be plastered white.

It's hard to tell from that video, but that's where I'd start.

@nottsbiker It's not a silencer. It's Yamaha Energy Intake System and is used to as a resonance boost bottle.

I've explained it before, but probably poorly. Definitely research it.