Rick,

The OS manual is WRONG.

This has been stated numerous times within this forum and also by "Mr. OS", Bill Baxter himself.
This is what the importer of OS had to say about their own manual.

You can also find information about it in these links:

http://www.rcuniverse.com/forum/m_13...tm.htm#1304662
http://www.rcuniverse.com/forum/m_13...tm.htm#1309351

and especially here:

http://www.rcuniverse.com/forum/m_70.../tm.htm#704159

Doing it as the manual says may cause the engine harm.

If still in doubt, write to Bill Baxter, or look for more information here: http://www.rcuniverse.com/forum/forumid_133/tt.htm .