My friend has a VW Baja with a stock 1600 bus motor dual port with stock solex and exhaust straight piping. I was wondering why the right bank is running lean and the left is running rich. and help is greatly appreciated!

look for a vacuum leak in the right intake manifold gasket area.

past that, i donno.

but you might mention how you determined that one side is rich and the other lean...

when you say "stock Solex" do you mean a single, centrally mounted single-barrel carburetor, or do you mean something else ?

When you say "straight piping" are you talking the intake manifold or the exhaust?

If there is no restriction in the exhaust (bends, mufflers, etc) you could feasibly be "over-scvangenging" the cylinder on that side...meaning the intake charge is going down the exhaust pipe and not being trapped in the cylinder.

its a single solex and I will get some oictures tomarrow to show you. I will check the engine today in Autoshop. The exahust is straight piped for the most it comes out of the engine then curves to the right. I will show you later tomarrow
Thanks
Z

If that side of the engine is running hotter head temps (due to crappy cooling system or poor cooling) it will run leaner..

Hotter = Leaner

The issue may very well be in the cooling system..

How would I find out head temp? He doesn't have a temp sending unit because the guy that had it before him just dropped the engine in. I do have a digital surface thermometer. Would that work?