posted 03-27-2003 02:58 PM ET (US)
This is a little bit off the topic, but related to your 2-HP Johnson.I have a 1977 2-HP Johnson that a friend gave to me. It was stored for years and seized up. The local Johnson dealer wanted $400 to fix it. She gave it to me and within an hour I had it running. I have run it every year for the last 15 years, they are very good motors.
The only problems I ever with it was poor low speed performance and damp points, which I fixed by doing two things.
I increase the diameter of the above-water exhaust holes. I drilled out to about a 3/8-inch. two of the four exhaust holes in the midsection, to eliminate the exhaust back pressure above the water at low speed Made a world of difference, no more chugging, sputtering and dying at slow idle.
I replace the points and condenser on the motor with a replacement Electronic Ignition Unit for a lawn mower: Yes, a lawn mower. The electronic ignition is waterproof and makes the motor run great at all speeds, all the way down to a heart beat. The unit discharges 5 to 14 times per revolution; the first discharge starts the combustion process and the other discharges increases efficiency, burning more of the available fuel without knocking or pinging. All the motors that I tried these units on have run better than at any other time. They also increase reliably and last for years. If I remember correctly my 2-HP model had a [positive] ground. The ignition unit is designed to operate with both a [positive] ground or a [negative] ground, no problem.
The first time I tried this in an outboard, was because I was having trouble locating points for a 20-HP 1967 Chrysler outboard. To date my Chrysler runs great, I have put about 1,000-hours on it since I bought it in 1979. I have these ignition units on several old outboard motors up to 25-HP, from the 1950's, 1960's, and 1970's, and they work great every time. Two cylinder engine need two units, one for each coil. Try them at your own risk, but they are the best $13 I have spent on an old motor.
Below is the information on the Electronic Ignition unit.
Electronic Ignition Unit Replaces Points and Condenser: Fires small engine spark plug 5 to 14 times with each impulse. Fits most 2 and 4-cycle, air-cooled engines. Maintenance-free. About the size of a quarter.
http://www.northerntool.com
Search on Electronic Ignition or try the link below.
http://www.northerntool.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=6970&langId=-1&catalogId=4006970&PHOTOS=on&TEST=Y&productId=11844&categoryId=0