Replaced gaskets all looked good and then up to 4000RPM she went...............bugger, I think that it for this year. I have a seal kit on the way. At least the revs don't go up when I spray around the gaskets like they did before.
Sure there isn't some cable tension or something else pulling the revs high, if it isn't leaking at the manifolds, which are trhe usual sources of grief, then it should just need to be adjusted down to 1600
I took the carburettors off again to confirm that they were closing properly, smeared a tiny bit of grease on each rubber and re installed them making sure they were pushed in all the way, tightened them up then tested. Would not idle so turned the idle screw until it would and hey presto, went up and down the street a couple of times and all good. Also fitted the new tyres today.
Problem came back today??????? I pulled the carburetors off again thinking it can only be that the grease was stopping the leak and had dissolved in the presence of fuel. I also noticed that there was a small sleeve on each of the boot clamps which restricted how much they could be tightened, these were removed and carburetors refitted without the aid of grease and clamped up. Now the problem is solved. Will take photos when I get back from OS. Bike is ready for RWC and rego.
Those sleeves are fitted to clamps on some models to prevent over tightening, you need to check if they are on the OEM part or not - may have swapped or stolen from another bike.
I've got a YZF600r that has the sleeves, they get in the way from what I consider to be tightening sufficiently, I think they're OEM so it looks that the manifolds have compressed/shrunk - they are after all 28 years old. I'l probably shorten the sleeves a wee bit
Just be aware that without the sleeves, if you crank them down all the way the clamps may distort. Once they do it's very had to get them back to their original shape - believe me I've tried, given up, and ordered new ones.