Try your local lawn mower and small engines repair shop, they may have the parts in stock or may be able to order them for you - you might also want to check on ebay.
A person can possible get a engine diagram for a 1997 Honda Accord 2.0 ILS at a Honda dealership. An auto parts store may also be able to print you off an engine diagram.
Engine diagrams for a 1994 Honda Accord are available through automotive parts stores. Honda Accord service repair manuals also carry all the necessary diagrams.
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Yes they are fairly easy to bolt in with the required parts and knowledge. If you research enough online then you will find out it is not too hard.
Wise Sales offers the Honda eu3000i Handi generator for sale along with many of the most popular parts and accessories. I ordered a replacement engine kill switch for my Honda from them. Check out: http://www.wisesales.com/EU3000i_handi.html
It is not very difficult to find parts for the Honda 300. One can search the net to find some sites that sell them such as Econohonda and Bernardiparts.
For a photo of the Honda Civic engine, see the Related Link.
Have the car taken to Authorised Repairer for the Honda Cars. They can find out what has happened to the engine.
On the engine.
Oil recommended is 10W30 Oil Filter is HONDA OIL FILTER 15400-PFB-014 / 004 You can find parts online - the engine in that model is a V twin 520cc: Honda GCV520
There are a few places where one can find parts for a 96 Honda Accord. This includes going to a Honda dealership, as well as looking at part suppliers online.
http://www.planopower.com/store/honda/index_mowers.shtml