I have a 90 St1100 with starting problems,could be the battery as she's been stored but now thinking the coils maybe original.How reliable were the original ones?
Do Coils fail on early ST1100?
- Thread starter Zider drinker
- Start date
- Joined
- Mar 18, 2006
- Messages
- 2,867
- Age
- 70
- Location
- Ilkley, W Yorkshire, UK
- Bike
- 2013 ST1300 A9
- 2024 Miles
- 000679
- STOC #
- 2570
If you suspect coils, then take a look at the earth contact with the frame. They can rust up. You need to unbolt them to see it.
Also spark plug leads.
Fuel filter is easy to check - thinking settled water / crud.
But if it has been stored for a while, the quality of fuel may be of concern.
Our USA friends will be muttering SeaFoam. Ive never seen it or used it but a quick search on here will reveal its credentials. Apparently it is available in the uk.
Also spark plug leads.
Fuel filter is easy to check - thinking settled water / crud.
But if it has been stored for a while, the quality of fuel may be of concern.
Our USA friends will be muttering SeaFoam. Ive never seen it or used it but a quick search on here will reveal its credentials. Apparently it is available in the uk.
Start with a fresh battery and fuel. After draining the old fuel.
Check for a spark.
If it doesn't go at that then start to look further. The coils are not a weak spot.
Good luck.
Upt.
Check for a spark.
If it doesn't go at that then start to look further. The coils are not a weak spot.
Good luck.
Upt.
ST1100Y
Site Supporter
No known issues on those early models (IRRC some loose crimps on '94~`95), throughout check of wiring, connectors and handle bar switch pods (incl. ignition lock switch-plate) seems adviseable
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Change the HT leads and dismantle the plug caps to clean and check for cracks. Does the engine misfire as it's warming up?
Leads look good no spark at all at moment,plugs ok,good idea re jumping from car as I don't think the starter motor is spinning fast enough.New battery on order,
Will do re connectors good news then re coils but won't rule that out later on
Ok many thanks
Yes fuel could be an issue..we have v low lead content stuff here calked E10 it eats carb rubber if the bike isnt used enough luckily at moment the better stuff is still about.Will do re earth on frame.Many thanks.
Many thanks to you all.Ill post when it fires up again with an update hopefully.I appreciate all help as I'm not mechanic...yet
Uncle Phil
Site Supporter
To answer your question - not usually.
If you have a multimeter available, test the leads on each side -
Earth in one plug lead, positive in the other set to ohms - should read 25-27 or so.
If you have a multimeter available, test the leads on each side -
Earth in one plug lead, positive in the other set to ohms - should read 25-27 or so.
Andrew Shadow
Site Supporter
Just a thought, just in case you overlooked it. Check the position of the kill switch.
If I remember correctly, the early model year ST1100's would still crank over with the kill switch in the off position causing this possibility to not come to mind.
If I remember correctly, the early model year ST1100's would still crank over with the kill switch in the off position causing this possibility to not come to mind.
stored for how long?
Six months was running before ok without misfite
Fuel problem. Give it a shot of starting fluid or pull the fuel ilne off and see if any comes out when you turn the key on. Is it possible mice got in there and ate some wires?
Checked for mice etc when took fairing off luckily none fuel could be an issue though was starting bike,running it every other weekend as bike at my folks place.Tried spraying UK Easy Start into carb didn't want to know.
Did you try giving it throttle because now you can have a flooded condition, pull a spark plug wire off , hold it and crank it over if you get zapped , you have spark.