Barksavon
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| posted on 5/1/13 at 09:47 PM |
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Big Backfire
Had a run out in my Tiger today, its got a 2 litre Pinto with Megajolt and bike carbs. Went Ok but rev limit light was flicking on at well below the
4500 rpm limit its set to and then got stuck behind a tractor for about 2 miles. finally got past it and then when got chance put foot down and got a
huge backfire and flame out of exhaust and engine didnt run that great until got home about 2 miles later. Once home i cut the engine then went to re
start and it turned over really slow so put my meter across the battery. With engine running volts were jumping around from about 2volt to 14v, with
engine not running it read steady 13.7 volt.
I'm thinking a voltage regulator issue may be reponsible for the errattic volt reading but any suggestions/advice would be wecome as to this or
the back fire and running problem
Thanks
Ian
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daviep
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| posted on 5/1/13 at 10:11 PM |
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The odd voltage readings across the battery sound incorrect to me, there is no way a good battery can ever read 2 volts. I would double check your
meter settings and check the leads are connected properly as I feel you may be getting led a stray.
Might be worth checking the timing and also the crank pick up for security.
Cheers
Davie
“A truly great library contains something in it to offend everyone.”
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coozer
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| posted on 5/1/13 at 11:25 PM |
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Sounds like the alternator is playing up...
I had a problem a while ago where the car turned over slow, or not at all.. the battery had 13v but it dropped to nowt when the key was turned..
Turned out the battery was fooked and when a load was applied it caused a short over the plates dropping the output..
Might be worth trying a different battery first.
1972 V8 Jago
1980 Z750
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Xtreme Kermit
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| posted on 5/1/13 at 11:55 PM |
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I'd give the battery terminals a clean. Also where the earth lead meets the chassis and the engine.
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Grimsdale
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| posted on 6/1/13 at 09:54 AM |
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yep, check your earth strap, can be the only cause surely?
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britishtrident
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| posted on 6/1/13 at 12:29 PM |
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If the main battery and earth connections are making good tight contact and the same for the ignition LT connections but it s sounds like the the
two large blades connectors at the back of the alternator are arcing, this was a very common fault on 1970's Fords.
Remove the black cover at the back of the alternator and clean the blades with a nail emery board check the regulator conection wire is tight and
replace the back cove. Ideally you should replace the 3 blade block connector plug but you can gently squeeze the Lucar spades connectors in to
get a better connection
[Edited on 6/1/13 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Barksavon
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| posted on 6/1/13 at 12:42 PM |
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Thanks for the help, i'll have a look at it this afternoon
Ian
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