Tank off, anything else?

Why the vinegar? That is an acid and will deteriorate any coating inside the tank.
Flush and replace the coolant, inspect the hoses.
When was the last valve check performed?

Agree why the vinegar? Valve check if you don't know the history. Spark plugs are probably fine if the air filter is pristine. I would simply check them. I think iridium plugs, though probably better are a waste of cash. Check the little fuel line between the cylinders.

dravnx said:

Why the vinegar? That is an acid and will deteriorate any coating inside the tank.
Flush and replace the coolant, inspect the hoses.
When was the last valve check performed?

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The gas say in that tank for 6 years. The vinegar is a very mild acid which is intended to clean out any varnish and I'm only leaving it in there overnight. It was the highest recommended and mildest of tank cleaners I could find.

I know nothing of prior maintenance. Previous owner did not maintain records. But it's only got 21k miles on it.

Not sure it matters to clean varnish in the first place. I've seen people use vinegar for rusted tanks, but it will also quickly flash-rust almost immediately after being drained. After you dump it out I would flush with water straight away and immediately refill with gasoline. It's a lot easier to remove a little water from a tank than rust.

Being the 1000 I would use wire and secure the throttle bodies in place.

The 1000 will often pop back through the bodies and dislodge them.

Do the magnets move on the 2004 ?

Pull apart all connectors you can find and make sure they are free from corrosion. Pay extra attention to the large one with the rubber boot on the front left..

You might want to investigate getting a new fuel pump if it's been sitting with old gas for 6 years or so. Or at least a new strainer.

Gasoline is an excellent varnish remover. As Mr Fox points out, any acid will cause the steel tank to flash pretty fast. A litlte varnish is actually not a bad thing in an old tank. If it was me, I would flush the tank with fresh gas just before I installed it and then fill it.
If you have no records, do all that I recommended, especially the valve check.

Do you plan on adding any electric accessoires up front that require a lead back to the battery? Those power leads are a lot easier to install and secure with the tank off.

In fact, removing the plastics and the tank is the first thing I do for any sort of maintenance, and the very last thing that goes back onto the bike.

Install a headlight relay ?. To avoid eventually cooking the connectors noted above ?

I would definitely flush the coolant and also service the ignition button (it is common to get some oxidation and the main headlights won't turn on).

Get some distilled/deionized water and flush it through the system to really clean it from older coolant.

A few photos of when I worked on my [email protected] model:

Re coolant: At least it was still a liquid

A USB inspection camera is < $20, get one and get a look at the filter sock in the tank. IF it looks to be packed with crud those can be replaced. Otherwise, just FI cleaner and ride. In my experience that's been really good at clearing those filters.

You CAN replace the pump but it's tricky as all the associated plastics get brittle with age and you really need to use lockwire to stop things falling apart after the pump is replaced. (Leave well alone if you can).