New ignition system: need advice!

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81mhr900ss
750 GT
Posts: 154
Joined: Tue May 31, 2016 3:49 pm

Re: New ignition system: need advice!

Post by 81mhr900ss »

I'm talking about the pickup circuit board inside the engine, not the external black box!
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ashleyf
Cucciolo - the Lil Pup
Posts: 21
Joined: Sat Aug 22, 2020 11:36 pm
Location: Sydney Australia

Re: New ignition system: need advice!

Post by ashleyf »

Understood Rick. Luckily the pickup can be replaced relatively easily . just a matter of unbolting clutch cover and replacing. There are two 5 mm screws , not slotted so it is a case of unbolting and replacing.
Will also check coil resistance at cold and hot.

Getting there.....
1976 900 SS. Sydney OZ.
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ashleyf
Cucciolo - the Lil Pup
Posts: 21
Joined: Sat Aug 22, 2020 11:36 pm
Location: Sydney Australia

Re: New ignition system: need advice!

Post by ashleyf »

Ok. Had the bike on a Dyno to see if coils were the issue . Same output at hot and cold. Alternator was barely producing 12 V . So, replaced alternator which was going to earth , replaced the fried wire from it to the regulator.
Took it for a half hour test and restarted first kick when hot.

Still scratching my head why it would start first kick when cold and then be a beast when warm. Anyway , hoping that this will fix it . There is only so much 'mystique' I can handle !!!

Beautiful to ride . Big difference from the last bike (78 900SS ) 20 years ago and now. A LOT more attention from passerbys .
1976 900 SS. Sydney OZ.
rjk40
750 GT
Posts: 185
Joined: Thu Dec 05, 2013 10:54 am
Location: Malabar, Florida

Re: New ignition system: need advice!

Post by rjk40 »

Great! There are "mystiques" surrounding things electrical:
As a computer techie, I was working on an old machine whose wires were connected in taper pin "buggies", they frequently
fell out for no apparent reason. One seasoned veteran said that "it was the solenoid action of the taper pin under current".
Probably B.S., but food for thought. Perhaps the fried wire earthing did the most damage when things changed dimensions (or in the case of the wire, failed to insulate...) a bit when hot, and deteriorated the performance of the alternator.
Persistence pays off once in a while. Wishing you much enjoyable riding.
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ashleyf
Cucciolo - the Lil Pup
Posts: 21
Joined: Sat Aug 22, 2020 11:36 pm
Location: Sydney Australia

Re: New ignition system: need advice!

Post by ashleyf »

Update. Bike starting beautifully when cold. When hot , it needs a bit of coaxing. Definitely doesn't like being over primed , so seeing fuel drip during tickling is probably counterproductive for Frankie. (Turns into cranky Frankie then.)

At least I don't have the fear of being stranded.
1976 900 SS. Sydney OZ.
rjk40
750 GT
Posts: 185
Joined: Thu Dec 05, 2013 10:54 am
Location: Malabar, Florida

Re: New ignition system: need advice!

Post by rjk40 »

Hi.

When you say "priming", can you clarify?

My 1975 860GT has Dellorto pumper carbs, with no tickling capability, as, say, my old Norton's Amals
that had tickler buttons.

Do you mean just pumping the throttle a few times to get the juice running?

I've never had an occasion to either prime or choke a warm engine,
so I am a bit confused.
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ashleyf
Cucciolo - the Lil Pup
Posts: 21
Joined: Sat Aug 22, 2020 11:36 pm
Location: Sydney Australia

Re: New ignition system: need advice!

Post by ashleyf »

Has the ticklers.
Experimenting still. When warm , won't start without some sort of fuel ' encouragement'.
Just kicking it without a couple of throttle twists and/ or priming with ticklers/ pumps doesn't work.
Issue then is flooding.
So I open throttle fully and kick a couple of times. The resulting howl as it starts at max revs certainly gets attention. I hope not to have to do this too often.

Annoying thing is that - at about 30 mins rest- it will sometimes start with the half kick.

Learning,learning . Absolute BLAST tho on the bike, and nice to meet so many helpful people vicariously.
1976 900 SS. Sydney OZ.
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Craig in France
Paso 750
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Joined: Tue Mar 23, 2004 3:58 pm
Location: Montpellier, France

Re: New ignition system: need advice!

Post by Craig in France »

ashleyf wrote: Sun Dec 06, 2020 11:52 am So I open throttle fully ...
1/4 turn, no more. :tisk:
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