QuestionI own a 1985 honda vt1100 shadow at times won't start found out no spark at any of the 4 plugs sometimes bike will start right up other times won't once it is running it will run good but problem started orginally after hot soak now it will do it at anytime.I have a manual that came with the bike when I bought it used 2 yrs ago and I work on cars for a living for the past 27 yrs any help Thank you
AnswerJoe.... if you know that all 4 plugs are dead at the same time, then there is a commonality to check into. Things that affect the whole ignition system in that way would be:
Ignition switch: With CDI ignitions, the ignition switch grounds the sparks out in OFF position, rather than opening a circuit.
KILL Switch: on the handlebars, could be getting corrosion buildup inside or contacts wearing out from age/vibration. Remove, disassemble, inspect and reassemble, then check all wiring to and from the handlebar switch.
CDI module control unit: $400 for a new one. You would need a shop manual and appropriate testing equipment to troubleshoot this one. Check wiring connector carefully.
Pulsar unit: Next to the flywheel, generates timing signals to the rest of the ignition system. A bad connector/connection there could be a cause.
Go to: www.bikebandit.com for illustrations of the parts, unless your book is an OEM copy with pertinent info already handy.
http://www.hondashadow.net/
http://www.shadowriders.org/
http://www.hsocuk.com/
maybe helpful resources, too
Bill Silver
