Re: Engine Balance
AutoTech....Unfortunately that 1973 65hp model is a tough one to locate parts for at times. I checked over my remaining stock and sorry to say, I don't have any of the items that you mention.<br /><br />The head planing thing..... you can use a thick piece of flat glass (they're usually perfectly smooth and flat), or some other known perfectly flat surface. Lay a sheet of 220 wet or dry sandpaper on it, wet it down with mineral spirits and work the head on it in a figure 8 motion. If the head is just ever so slightly off, that will take care of it. If it's obvious that it's warped bad, the machine shop would be the route to go. A word of caution.... if too much material is taken off, the compression will increase to a point whereas pre-ignition may occur, which will result in a melted piston.<br /><br />According to my books, the 1973 65hp Evinrude parts as listed below are still available. This may be in error but the books say otherwise... at any rate, I'll list them for your reference. Note that the std and 020 pistons come with the standard (original 5/8" size) wrist pin, wrist pin clips, and piston rings.<br /><br />OMC Original & Superceeded Part Numbers:<br /><br />Std Piston-386251 -approx $150.00 (with rings etc)<br />.020 Piston-386257-approx $160.00 (with rings etc)<br />.030 Piston-386260-approx $123.00<br /><br />Std Ring Set - 385807 - 396377 approx $33.00<br />.020 Ring Set - 385808 - 396378 approx $30.00<br />.030 Ring Set - 385809 - 396379 approx $33.00<br /><br />Std (Regular) Wrist Pin Bearing - 378251 Approx $25.00 (For 5/8" dia w/pin)<br />-------------------------------------------<br />I don't know who handles "Wiseco" pistons in your area, but I do business with Precision Mfg in Clearwater, Fl. Their "Tech Service" phone is 1-813-442-4025, with their fax number being 1-813-446-1163.<br /><br />Wiseco's Tech Assistance Number is:<br /><br />1-440-951-6600<br /><br />You'll have to check with them for their latest prices.<br /><br />The Wiseco pistons includes the wrist pin, wrist pin retainers, and piston rings. However, the catch is that you must use the 3/4" wrist pin bearing to accommodate the larger wrist pin. The wrist pin is included with the piston as mentioned above.<br /><br />Wiseco Piston Bores & Part Numbers<br /><br />3.00" - Std - # 3015PS<br />3.020 - .020 - # 3015P2<br />3.030 - .030 - # 3015P3<br />3.040 - .040 - # 3015P4<br /><br />Wrist Pin Bearing Conversion Kit<br /><br />Old #WP15-1 - - - - New #B1029<br />------------------------------<br />Whether this info will be of use to you or not, I wish you luck with your engine.<br /><br />Note that the difference in weight will not affect your engine balance. I've went this route many times and always had a smooth running engine when finished.
