Has anybody ever heard of cleaning motorcycle carburetors like this?

I have an 85 kawasaki 454 it sat for a few years and got clogged up. We drained the gas and took apart the carbs and cleaned them as best as we could. and even put in a carb new rebuild kit. Added some carb cleaner to the gas and I have been driving it as much as I can maybe 1 day a week like 40 minuets each time. And it is stubborn to start takes a few cranks and takes a while like 5-10 minuets to warm up if you do not wait it is hell to take off in. Even driving down the road you can feel the hesitation like when you are at a steady speed (55). Here is the question somebody told my husband to run out all of the gas add laquer thinner for a few runs and that will fix it is this crazy the can said not to be used as a fuel. I do not want this to blow up on me?