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Post by johnjones on Jan 24, 2021 9:16:37 GMT
I have a 1980 superdream 250.
I have the Haynes book with a wiring diagram.
The engine turns over by hand with everything being ok.
With a good battery the engine refuses to turn over.
The motor works ok and will turn the engine over when jumped from the battery.
The solenoid clicks ok on a bench test, and will allow the engine to turn over when the solenoid is jumped.
The handle bar clutch switch seems ok, with the information from the wiring diagram.
The neutral switch seems ok as well, as does the start button.
How does this system work please, as the started motor is prevented from working when the bike is in gear, but will work ( mine will not ) when the clutch is pulled in on the handlebar ?
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Post by CTB on Jan 24, 2021 9:22:42 GMT
I would suspect the solenoid, I know you state this works on a bench test, but if you say when you jump it (I assume you are bridging the terminals) I would change the solenoid. I have a spare working one if you need one posting.
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Post by johnjones on Jan 24, 2021 10:35:15 GMT
Thanks CBT, but on a bench test the solenoid clicks, via energising the 2 energiser wires.
When we do the same on the bike with jump wires, one from battery positive and the other earthed, the starter motor spins up the engine, plugs out and grounded and ignition killed.
This suggests the solenoid and starter motor and it's wires are all ok.
Seems there is a problem with the bike wiring.
How does the system work.
If I understood how the system works, the starter lock out system when bike in gear and clutch out, then I might be able to work out what's wrong.
I am studying the wiring diagram and will probably re draw a diagram for what is involved in the system only, a simple diagram just for the electric starter motor system.
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Post by johnjones on Jan 24, 2021 10:39:39 GMT
Thanks CBT, but on a bench test the solenoid clicks, via energising the 2 energiser wires.
When we do the same on the bike with jump wires, one from battery positive and the other earthed, the starter motor spins up the engine, plugs out and grounded and ignition killed.
This suggests the solenoid and starter motor and it's wires are all ok.
Seems there is a problem with the bike wiring.
How does the system work.
If I understood how the system works, the starter lock out system when bike in gear and clutch out, then I might be able to work out what's wrong.
I am studying the wiring diagram and will probably re draw a diagram for what is involved in the system only, a simple diagram just for the electric starter motor system.
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Post by buster on Jan 24, 2021 12:06:52 GMT
I'm in agreement with carl here, sounds likely to be the solenoid. but if your absolutely sure thats ok then the safety circuit is controlled by the neutral light switch and the clutch lever switch, this runs through a little square gizmo under the left side panel (confusingly called a rectifier, as far as I can see its a single diode) so you should be able to temporarily join the light green/red wire to the green/red wire and bypass the safety system. this should give you a direct connection from button to starter solenoid.
just as an aside is the starter button switchgear properly earthed?
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Post by buster on Jan 24, 2021 12:09:23 GMT
the afore mentioned gizmo  |
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