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It's a 4-cylinder engine, and the carbs are really wedged in there. The best way I know is to loosen the boots on both sides, pull the carbs back, and try to slip them out sideways, but what a pain! Those boots are stiff enough that getting the carbs out is really hard.
How do you do it?
Don't worry, you're not the only one who had to endure this pain...
I had an old KZ650 I pulled the carbs from what it looks like a similar design. Like yours, it was older and the plastic air intake tubes were very stiff. Here is what I had to do.
I then cleaned out every carb and put it back together. Sliding those individual air tubes back forward and into place took a lot of work and the help of a friend. I got it back together, but I really damaged and scratched up the air tubes from the air box. It worked great though, just looked bad.
In addition to Troggy's sequence, make sure that the clamps on the airbox boots, and the intake boot are fully loose with some slack, and using some heat from a hair-dryer or heat gun will make the rubber boots much more supple.
On my old bike, I had to pull the fuel tank off to get the carbs out.
If anything, it will make the job much easier in terms of access for your hands.
