This is a pretty good review for the 1994-2002 magnas I don't know about any for the 80's Magnas http://www.motorcyclecruiser.com/roadtests/honda_magna_750/index.html
I have a 1982 v45 magna and the timing chain is loose can it be adjusted thanks
AS YOUR SITTING ON THE MOTORCYCLE, IT IS BEHIND THE R.H. SIDE COVER
The air filter is under the gas tank
10W40, 3.5 liters for a V45 1982
Clymer 1982 - 1988 Honda V45 & V65 Magna/Sabre repair manual has 0.031 - 0.035 in.
Penny Cox has written: 'Honda V45/65 Sabre & Magna (VF700, 750 & 1100 V-Fours)' -- subject(s): Maintenance and repair, Honda motorcycle, Handbooks, manuals
Without any context it's hard to tell, but it presumably means "version 45". It could refer to the 1983 Honda V45 Magna or the Princess V45 Sports Yacht, or anything that has V45 in the title.
its 10w 40 and 3.5q
H3 you can get one from your local auto parts store
HP was 82 or 83 on my 1983 Magna, Do not remember the torque but it is a very fast bike for a 750
Carbs probably need to be cleaned and a tune up wouldn't hurt either