Questionhi my 1962 dream ...i was wondering what would cause the bike 2 keep blowing sparkplugs....i put sparkplug in runs for 3 minutes then wont fire no more...i take it out put new plug in and same thing over and over been awhile since i tried 2 work on the bike...kinda mind boggling asked some friends bout it they shrug and say bike 2 old they dont know ..i also have the book it also dont explain it..engine# is 212483 any clue what # the bike is of production line ?
AnswerDarin, the Bike/Engine is 1962 production... #2483 motor, anyway.
The single coil is double ended and needs both plugs grounded to test. Check the primary resistance values on the coil, which should be about 4.5 ohms on the two small wires, disconnected from the harness. If that is correct, then you may have either a broken lead on the secondary (plug wires) circuit, or it is shorting out somewhere between the coil and the plugs. Do not use resistor plug caps or plugs on these bikes. Non-resistor caps and regular D8HA NGK spark plugs should be fine.
Are you sure you aren't fuel fouling the plugs due to a dirt carburetor? Is the ignition timing set correctly. Check it running with a dynamic timing light to check spark advance curve. Don't let spark timing excess the II marks on the rotor, which is 45-48 degrees BTDC.
If the coil is bad, try a new DYNA coil with correct resistance value around 4.5 ohms. Check your old spark plug wires, too, to see if they are cracked/broken somewhere inside the frame. If you have the original coil, the leads will unscrew from the coil tower so you can remove/replace the leads with some solid core plug wire from a tractor shop or some race shops.
I have full restoration guides on CD available for Dreams.
Bill Silver
www.vintagehonda.com
