SOHC.co.uk Forums > CB500/550
500 Start Up Issues
philward:
--- Quote from: K2-K6 on March 16, 2021, 02:44:54 PM ---Forgot to add, as Ken suggested it looks like the starter motor is failing in some way. I'd look at that firstly, the car battery would probably have enough grunt and size to melt something if there's failure, that's in comparison to the bike battery.
--- End quote ---
My thoughts too - when I fitted sprocket cover, the starter lead was inserted in the case grommet but from memory, on some of the Honda starter motors, the cable entry point can be suspect (short on the starter casing?). Got to take the better half for her covid jab this afternoon, so maybe tomorrow before I get the starter motor out
philward:
--- Quote from: K2-K6 on March 16, 2021, 02:51:00 PM ---You could use the 750 as reference.
Meter for continuity down the positive starter lead across to earth to give yourself reality check on numbers.
--- End quote ---
Why didn't I think of that! Just checked and I get same - ie, continuity - the live switching must 'shunt' the earth to the other side of the load (starter motor). This complicates it as why is the battery shorting itself out when I press starter button - solenoid engagement - bearing in mind that I've tried another solenoid? (its been on tandem charge - method to recover completely nacked battery - for 3 hours and still zero!)
Do I risk another shorted battery if I use the 750's battery!
K2-K6:
I wouldn't put a battery on until the starter motor is physically checked, risks doing the same.
IF it has taken the battery out it would be quite a chunky short.
McCabe-Thiele (Ted):
--- Quote from: philward on March 16, 2021, 03:16:23 PM ---
--- Quote from: K2-K6 on March 16, 2021, 02:51:00 PM ---You could use the 750 as reference.
Meter for continuity down the positive starter lead across to earth to give yourself reality check on numbers.
--- End quote ---
Why didn't I think of that! Just checked and I get same - ie, continuity - the live switching must 'shunt' the earth to the other side of the load (starter motor). This complicates it as why is the battery shorting itself out when I press starter button - solenoid engagement - bearing in mind that I've tried another solenoid? (its been on tandem charge - method to recover completely nacked battery - for 3 hours and still zero!)
Do I risk another shorted battery if I use the 750's battery!
--- End quote ---
Are you using the type of charger that will charge a completely flat battery - pulse chage technology some call it? Do you mean Tandem or in Series? Charging in Parallel is unlikely to recover a very flat battery IMHO- to my knowledge only Smart Chargers or Battery Chargers over 40 years old are likely to succeed on a completely drained battery. Just my opinion.
philward:
I am grasping at straws Ted - I have been on Youtube and the parallel (or tandem) technique was suggested a few times - its an optimiser but have an old school charger as well (about 30 years old I guess) - which one do you suggest? May be a duff new battery and sparks from from when jump leads attached may be caused by inadequate contact between jump lead crocadile clip and bike leads (for starter motor current draw) - hence it went to zero as it was duff, not because of a short via solenoid (see previous post on a ground also showing on my fully working 750 starter lead.
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