Kawasaki overheating?

Hi I have the above bike and have had a problem with the Carburettor. It sat for about 10 years and I had to clean it out as there was a lot of gunk in it. Some of the jets I could not get out, but blasted them with Carb cleaner. One of the needles was beyond cleaning and could not get a new one so have had one made (10 in fact). However, one of the exhaust pipes is getting very very hot ‘Red that is’. The other is normal temperature. I have not put it on the road as I’m sure I will damage something with this.
Any Ideas why it is doing this?