Re: What should I do before trying to start my HD 25
If you post the serial number we can pinpoint a year for you.
The Johnson H or T series motors may be a bit different from what you are used to.
Start by testing the compression, if the powerhead is ok, you can start with your tuneup.
Start by testing spark. If she is sparking great, you are lucky. Chances are you will have no spark. Points will need to be cleaned/re gapped and the coils inspected. If they are cracked dont bother testing them, they are no good and will need to be replaced. If they look new test the primary and secondary windings. Gap the points to 020 after dressing with a points file, then clean with acetone or the like. If the plug leads are cracked/rotted they will need to be replaced with new solid core plug wire. Plugs are Champion J6J gapped to 030. Here is a good link for testing the ignition system.
http://www.pochefamily.org/outboard/Coils.htm
http://hoodad.fortunecity.com/biglures-motors.html
You will then need to go over the fuel system. Ensure the tank is free from rust/varnish. May need a cleaning before proceeding. Pull the carb and thoroughally clean/rebuild it. Here is a great link to aid in this.
http://www.pochefamily.org/outboard/CarbService.html
http://www.pochefamily.org/outboard/FuelValveCleanout.html
It is now time to replace both the gear oil and water pump. Drain the oil before removing the gearcase, then replace after re installing with new drain/vent gaskets. Let us know if you need help with any of this. You likely will your first time.
http://hoodad.fortunecity.com/hd25index.html
