Ignition diagnostic help! Electrical resistance specs needed

All Engine, Clutch, Chains, and Sprockets Stuff Here.
Post Reply
MX500
Posts: 19
Joined: June 8th, 2008, 11:46 am
Location: Central CA

Ignition diagnostic help! Electrical resistance specs needed

Post by MX500 »

I have a 1987 CR500, I thought I fried it from running a bit lean, turns out it has 145PSI compression which should be enough to run. It actually has no spark. The bike would go from running great when warm, to cutting out when it got hot. Now it doesn't even spark when its cold.

I need the resistances of the coil, stator, "hall effect sensor lookin ass thing", and other ignition parts likely to cause the issue. I tried to find a free FSM online but had no success. Any help will be greatly appreciated.
1987 CR500 Stock
1970 240Z Pretty damn quick, beats Harleys every time.
User avatar
Kuma
Posts: 854
Joined: February 7th, 2010, 8:26 pm
Location: Norco, Cali

Post by Kuma »

I would try to locate a local hoon and try swapping out parts, starting with the coil.
User avatar
coley13
Posts: 262
Joined: June 15th, 2007, 11:19 pm
Location: australia

Post by coley13 »

mine did exact same thing just the other day. Turned out to be the coil. Resistance values where the same so wasnt giving me a diagnosis..

Not sure on 87.

Mine was

.6 ohms primary winding
18 ohms secondary winding "with cap"
13 isnt unlucky i just keep falling off
MX500
Posts: 19
Joined: June 8th, 2008, 11:46 am
Location: Central CA

Post by MX500 »

I got some readings, the kill switch is functioning properly, but I forgot to check for a short to ground :x

The little black sensor (forgot the name, sorry.) has 124 ohms read between green/white and blue/yellow wires; on the ignition box side of the of these wires I read an open curcuit.

I read 23 ohms resistance between the blue and white wires going to the stator, on the ignition box side of that connection I read 29,000 ohms resistance.
1987 CR500 Stock
1970 240Z Pretty damn quick, beats Harleys every time.
MX500
Posts: 19
Joined: June 8th, 2008, 11:46 am
Location: Central CA

Post by MX500 »

Fck it. The bike is sitting in pieces until I get my OTHER ignition problem fixed. Ever since swapping in my GM AIDS (HEI) module, my 240Z runs on four cylinders below 7000rpm
1987 CR500 Stock
1970 240Z Pretty damn quick, beats Harleys every time.
Post Reply