Idles to rich

Perform a compression test on both cylinders. If there is a significant difference between the two you may have a stuck ring or stuck valve from sitting.

Please take out your spark plugs and check their electrode condition. If they are black then you have a very rich mixture. That could be a faulty ignition spark (weak) or clogged airway in the air filter housing. Also check the carb's needles if they are adjustable in height, pute them in the middle scale. I believe when you were cleaning the carbs, you took out the pilot screw and the idle jet and cleaned that circuit thoroughly.
If they are white then your mixture is lean (probably your intake system sucks extra air from the intake collars where you plug the carbs on to the cylinder head or from the collars that connects the carbs to the air filter housing)

I would start with a new start of spark plugs...look closely at the ones you remove and from which cylinder they came out of...Learn to "read" your plugs, you can tell a lot by doing this on what kind of fuel mixture you are getting...a light colored electrode will indicate a lean mixture, a black would mean rich, black and wet, fouled and not firing...ideally they should be a dark brown. The injectors are probably dirty. Buy a can of "seafoam" pour half of it in on a full tank of gas and use the other half on the next tank...it works good to clean the fuel system. Your valves should be checked at 24000 miles....also check your charging system, the EFI on your bike is senstive to low voltage and surrges...you should have 13.5-14.5 vdc at the battery at 2000 rpm.
good luck, i hope this helps.

The easiest way to tell is have a look at the spark plugs and see what colour they are.
The should be a light brown, if black then you are running rich and will need to adjust your carbs.

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Many thanks

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Could be a number of things...
Black ooze is due to being too rich. You need smaller jetting. (Pilot and main) You can read the spark plug for jetting, as you want it to burn chocolate brown.
Also, a carbon plugged exhaust power valve can cause poor high rpm performance.
A compression test will tell the condition of your rings.

The starting hard and Idling problem sounds like carb needs cleaning. If this bike has moved from a different area it might need different jets in the carb. I might have jumped the gun the gas/oil mix ratio is very important check that first. your spark plug should be a golden brown when mixture and right jets are in. This might resolve the low end power if the oil mix is to rich or you might need piston rings. GOOD LUCK

You're on the right track by leaning out the mixture. The best way to see how close to optimum the mixtures are, is to look at the color of the spark plugs: white = too lean, black or dark brown = too rich, dark tan to light brown spark plug color = just right. For the most accurate reading, operate the engine in the throttle and RPM range that you wish to check, then shut the engine off immediately and coast to a stop (don't let it idle as this will throw off the spark plug color).

Assuming your valves have been checked, and the air filter is clean...
You carb has an accelerator pump, and these can get corroded. Make sure your carb is thoroughly cleaned.
There is an air idle adjustment screw on the bottom, that will affect starting, and idle.
The last issue could be a slow jet that may be too rich or lean. This will affect from idle to 1/4 throttle. The best way to read it is run it there for a while, and remove the plug to see the color. Too white is lean, and black sooty is too rich.

Several things come to mind on this. First, rejetting should be done by someone that can do all of the fine tuning also. If the idle mixture screw on the carburetors are still covered, you need to expose them for adjusting. Pull one spark plug and look at the color of the electrode. Black is too rich (too much gas) and white is too lean. You want a lighter brown. Put the plug back in and start the bike. On each cylinder, adjust that idle mixture screw all the way in, being gentle, to the stop. DO NOT OVER TORQUE, YOU JUST WANT TO REACH BOTTOM. Make note of the screw driver orientation and back the screw out 2 turns. This is the starting point. If the bike will no longer idle, adjust the idle screw for about 1000 rpm's. After running the engine for a couple of minutes at idle, do not rev the engine, just shut it off. Pull a spark plug and check the color. Again, you are looking for a light brown. If it is black, turn that carbs mixture screw in 1/2 turn, white, turn out 1/2 turn. Do this for each carb. I know, this is not the quickest way, but it is a sure way of getting the right mixture. It will be time consuming and you might even burn your fingers on the hot plugs.
Now that you have the right mixture, it is time to balance the carbs. I use a Carbtune monometer. Google Carbtune. This is a must to get the bike to run strong and smooth. You will need a service manual for this procedure. Go to Delphi Forums and look up the RSV, Royal Star Venture forum and you will find an electronic version of the service manual there, for free. Hope this helps.
btw, there is not anything around the spark plugs to adjust.

Really...strange what you need to do is see if the bike is running too fat. So...warm her up witha fresh set of NGK! spark plugs. After the bike is warm take it down the street and back. When your on the way back get on the throttle and accelerate then shut er down and coast it into the garage. This will give an acuurate read on the spark plugs at operating temperature and under a load. Pull all the plugs. If they are brown like coffee with cream that means carbs are adjusted correctly. If they are black and wet too rich and if they are white or very light brown too lean. Other problems may be oil soaked plugs from loose top end parts. Maybe valves or guides.