First, unhook the headlight wiring to the hood. This is an easy step to forget (Don't ask me how I know).
The hood lifts off the hinge point when you tip it back a little bit from full open.
Remove the air filter cover:
This is where you're likely to start seeing mouse nest evidence. I had already blown it out of here when I took the picture of the air filter:
It will be necessary to remove the air filter later to remove the cowling but leave it on for as many steps as possible to avoid contamination of the engine.
There are 3 3/8" bolts that hold the cowling on on each side of the engine. Remove these and store them safely:
Next remove the air filter so that you can get at the two screws under the air filter. I removed these with a medium blade flat head screw driver:
Next, it will be necessary to remove the flywheel screen. It is held on by four 5/16" bolts:
I have some wires wrapped around the oil filler tube. Carefully unwind these:
Unclip the oil drain if you have one like this:
The engine cowling should now be free. Carefully lift it over the fly wheel, and slightly forward to clear the engine air intake:
This is what I found under the cowling:
Before starting to clean up the mess, put on eye protection and a mask if you live where Hanta virus is found, To protect the engine place the air filter back over the intake:
Between hand picking and blasting with compressed air a lot of stuff will come out of the engine parts. Make sure to get all the fins well:
Once everything is clean, just reverse the process and put everything back together. The only tricky part might be aligning the middle bolt on each side of the cowling. The order goes - engine housing - engine tin - engine cowling OVER the tin, then bolt.
Here is the engine all put back together before the hood went back on:
Hope this helps someone, I'm getting real good at it!
Edited by ggsteve, August 18, 2012 - 03:14 PM.