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Post by anna on Oct 14, 2023 15:47:08 GMT
Ah, seems I cannot post a picture.... It's easy - try again. There's an add photo button on the top right, even my pet gorilla did it once. |
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Post by alibev on Oct 14, 2023 18:44:19 GMT
Hi Ali bev, Could you post a picture of the new battery please and it's number, also a video with audio to show how fast it whizzed the engine over no please. Use starter for 5 second bursts, then wait 30 seconds for battery to "recover" and starter to cool down a bit. With a 5 second bursts, check starter motor terminal for heat, also starter motor body for heat, as well as earth points for heat. You say you know HT ignition system is producing a good spark. How please ? Are you using a pair of those red neons plug caps like seen in picture below ? Hi again, I will do all the tests that you suggest next week. I disassembled the starter motor (by cutting the bolts) and gave it a good clean as instructed in my Haynes manual. Both brushes have hardly any wear on them. Unfortunately, I cannot put it back together as I didn't realise that the bolts I ordered last week are on a ship from China and won't be here for another two weeks. Ordered some from another source and they should make it to my house by Thursday. Will provide an update then. |
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Post by johnjones on Oct 15, 2023 10:08:08 GMT
Hi Ali bev,
Any pictures...
Someone at least tried to get inside the motor before you, hence chewed up screws.
Any evidence of them actually getting inside ?
Brushes hardly worn, how many miles has the bike done ?
Much brush dust and how is the commutator, the bit the brushes run against.
Pictures pictures pictures...
Remember you have CMSNL exploded views to help on reassembly...
Suss out brush plate earth. You know of the "trick" involved with the brush springs ?
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Post by johnjones on Oct 15, 2023 10:19:39 GMT
Desktop mode  Machine mart |
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Post by johnfcbn44dx on Oct 15, 2023 14:09:44 GMT
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Post by BritPete on Oct 17, 2023 13:52:27 GMT
Silly question- have you made sure your headlamp is switched off
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Post by alibev on Oct 20, 2023 18:14:32 GMT
Thank you all for the continued support. I can't yet answer all of your questions as things have gone from bad to worse. It seems every time I touch the bike something breaks.
New bolts for the starter motor arrived from a UK supplier at the same time as those that were shipped from China. At least I have a spare set.
I followed all of the instructions for cleaning the starter, it was in good condition and all of the continuity tests were ok. Put it back on the bike and now the starter won't even turn. Dead as a door nail. The solenoid clicks but that is it. Changed the solenoid (again) but the same result. The new battery is showing a full charge. I can't believe I have broken the starter motor as it only has the one moving part. Logic suggests an electrical problem but at a loss to understand why the starter worked, albeit it wouldn't start the bike, before it's removal and not afterwards. The only other thing I have done is to check that all of the various electrical connectors were secured properly. I am quite close to paying someone to sort it for me as I am growing old too quickly to wait for my skills to catch up with the problem.
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Post by shuttlespanker on Oct 21, 2023 6:02:53 GMT
Have you tried taking a live feed direct to the starter?
To see how it turns?
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Post by alibev on Oct 21, 2023 7:07:58 GMT
Have you tried taking a live feed direct to the starter? To see how it turns? I haven't tried that yet as 1) I don't like the idea of all of those sparks flying around and 2) it was working before I took the starter motor off and reinstalled it. If I understand correctly connecting it directly would by pass the solenoid and relating starting circuits. That sounds sensible but I have tried two solenoids with the same result and they test ok. However, as I have run out of ideas I may have to face my fears and give it a try. |
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Post by BritPete on Oct 21, 2023 7:25:50 GMT
Have you tried taking a live feed direct to the starter? To see how it turns? I haven't tried that yet as 1) I don't like the idea of all of those sparks flying around and 2) it was working before I took the starter motor off and reinstalled it. If I understand correctly connecting it directly would by pass the solenoid and relating starting circuits. That sounds sensible but I have tried two solenoids with the same result and they test ok. However, as I have run out of ideas I may have to face my fears and give it a try. Put a set of jumper leads on your car - clip negative to the body and touch the positive on the motor terminal |
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Post by alibev on Oct 21, 2023 12:04:10 GMT
Latest update. I put my brave boots on and connected a spare battery directly to the starter using the terminal post and earth. I disconnected the bike battery first. I was expecting a hail of sparks and a whirring starter motor but nothing at all. Took the starter back off again and found that there was continuity between the screw thread terminal post and the casing. Thinking 5uw5 can't be right I opened it up and took it apart but didn't really discover anything. Put it back together carefully and tried again. Still completely dead. So I have decided I can't spend any more time on the starter motor so will look for a replacement.
BritPete if you are still willing to sell/exchange your one I am happy to do that if not I have seen one on eBay.
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Post by BritPete on Oct 21, 2023 12:12:15 GMT
Latest update. I put my brave boots on and connected a spare battery directly to the starter using the terminal post and earth. I disconnected the bike battery first. I was expecting a hail of sparks and a whirring starter motor but nothing at all. Took the starter back off again and found that there was continuity between the screw thread terminal post and the casing. Thinking 5uw5 can't be right I opened it up and took it apart but didn't really discover anything. Put it back together carefully and tried again. Still completely dead. So I have decided I can't spend any more time on the starter motor so will look for a replacement. BritPete if you are still willing to sell/exchange your one I am happy to do that if not I have seen one on eBay. I think that was Buster |
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Post by alibev on Oct 21, 2023 13:15:33 GMT
Latest update. I put my brave boots on and connected a spare battery directly to the starter using the terminal post and earth. I disconnected the bike battery first. I was expecting a hail of sparks and a whirring starter motor but nothing at all. Took the starter back off again and found that there was continuity between the screw thread terminal post and the casing. Thinking 5uw5 can't be right I opened it up and took it apart but didn't really discover anything. Put it back together carefully and tried again. Still completely dead. So I have decided I can't spend any more time on the starter motor so will look for a replacement. BritPete if you are still willing to sell/exchange your one I am happy to do that if not I have seen one on eBay. I think that was Buster Well spotted, thank you! |
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Post by duffer on Oct 21, 2023 13:43:13 GMT
You certainly put the work in investing the problem. I am certain the replacement will fix the thing. I have one also, but Buster is THE man for this. Never be afraid of a little bench testing. Bung the motor in a vice (or Black and Decker workmate) connect the live to a decent 12v battery. Connect a jump lead from the negative and touch the body of the starter. I promise you, it will just spin. No drama.
If you think that stuffs a finger up to elf n safety, you should try my technique for making a fuel tank safe before welding it ! 🤣🤣🤣
My view is, apply 1970's checks to a 1970's bike.
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Post by alibev on Oct 21, 2023 17:15:57 GMT
You certainly put the work in investing the problem. I am certain the replacement will fix the thing. I have one also, but Buster is THE man for this. Never be afraid of a little bench testing. Bung the motor in a vice (or Black and Decker workmate) connect the live to a decent 12v battery. Connect a jump lead from the negative and touch the body of the starter. I promise you, it will just spin. No drama. If you think that stuffs a finger up to elf n safety, you should try my technique for making a fuel tank safe before welding it ! 🤣🤣🤣 My view is, apply 1970's checks to a 1970's bike. Brilliant thank you. I will see what Buster says. I particularly like your 1970s approach to a 1970s bike. |
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