Just a left field question


Information and questions on GL1200 Goldwings (1984-1987)
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TheRepoGuy
Posts: 66
Joined: Mon May 20, 2019 9:44 pm
Location: Grayson, Georgia
Motorcycle: 1985 GL1200I Interstate
1985 GL1200A Aspencade

Just a left field question

Post by TheRepoGuy »



Afternoon folks - took a break from the old girl for a bit to get some other parts ordered and because I was starting to get severely frustrated with it not running. But I had a thought...
Would having a severely weak starter cause these old girls to not start?

If my mechanical brain works the way it needs to, the motor has to spin over fast enough for the pulse generators to “see” there’s movement and initiate the spark sequence from the coil....less having a computer to tell it when to fire.

Not saying I could have eliminated replacing or rebuilding half my bike because the parts needed to be replaced but if I could have started initially with just the starter maybe I should have ha!!
Nate



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virgilmobile
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Re: Just a left field question

Post by virgilmobile »

A very slow turning engine will have difficulty starting.Before you tear that apart,attach a spare plug and see if you have a robust spark.
I can make them spark just by moving a screwdriver slowly past the pulse coil.
A SLOW cranking has difficulty drawing in the fuel from the jets on the intake cycle.Remember..there not fuel injected engines(except for a few).It takes air flow and a vacuum to suck the fuel out of the carbs.As always..On the first crank..the throttle should be left closed to get fuel into the cylinder.

oldmopars
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Re: Just a left field question

Post by oldmopars »

If your battery is good and your starter is bad it can draw a lot more amps than it is supposed to and this will take power away from the ignition system and cause it to not start even if the engine will turn over. I have seen this many times in cars/trucks. Electronic ignitions and EFI have a minimum voltage required for them to play the game, if it is too low caused by high amp draw of the starter they won't play.
You can test this by having your bike either pushed or pulled and pop the clutch to start it. This way you are not using the starter and no power is being drawn away from the other systems.

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TheRepoGuy
Posts: 66
Joined: Mon May 20, 2019 9:44 pm
Location: Grayson, Georgia
Motorcycle: 1985 GL1200I Interstate
1985 GL1200A Aspencade

Re: Just a left field question

Post by TheRepoGuy »

virgilmobile wrote:
Tue Jun 18, 2019 9:41 am
A very slow turning engine will have difficulty starting.Before you tear that apart,attach a spare plug and see if you have a robust spark.
I can make them spark just by moving a screwdriver slowly past the pulse coil.
A SLOW cranking has difficulty drawing in the fuel from the jets on the intake cycle.Remember..there not fuel injected engines(except for a few).It takes air flow and a vacuum to suck the fuel out of the carbs.As always..On the first crank..the throttle should be left closed to get fuel into the cylinder.
She’s already tore apart oddly enough...and just had the starter rebuilt. Dropping an AGM battery in her tomorrow so that will hopefully help the situation. Leaning more towards the pulse generators than anything else as to why I have no fire now. Everything else has already been replaced, checked and cleaned/rebuilt on this old girl. Process of elimination the hard and expensive way ha!



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