andrew.carwithen
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| posted on 6/4/07 at 12:54 PM |
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Whooohoooo!!! the beast lives!! (sort of!!)
I'm so happy!! the beast finally burst into life!! Whatagoddamshedevilbitchofawhore she sounded too!! Still grinning from ear to ear!
Can't get her to idle yet as sounds like she's only running on two cylinders.
Anyway, I've checked that plugs are working ok by shorting each of them out on cylinder head and checked each HT lead in turn with one of the
good plugs and there's plenty of sparks all round.
However, I've read on previous threads that the plugs are prone to failure once wet and should be replaced as a matter of course? (they are the
original used NGK type R plugs that came with the engine)
So, even though they're working fine outside the engine, is it a case they're probably breaking down under load once screwed into the
head?
Don't want to splash out £30 on a set of plugs unnecessarily, so have others had similar symptoms to above which has been cured by a new set of
plugs?
Andy.
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jambojeef
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| posted on 6/4/07 at 01:00 PM |
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Can I make it 3 in a row??
Ok Andrew, with all of the plugs out and earthed but still conected to the leads - do 2 of the sparks look brighter than the other 2?
If there are 2 that are defo brighter than the others - see if they are coming from the same coil and if they are - it just might be that my party
trick of swapping over the LT leads to the coil will sort it out.
Its a long shot, but it might just work - as Hannibal used to say.....
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andrew.carwithen
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| posted on 6/4/07 at 01:13 PM |
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quote:
Originally posted by jambojeef
Can I make it 3 in a row??
Ok Andrew, with all of the plugs out and earthed but still conected to the leads - do 2 of the sparks look brighter than the other 2?
If there are 2 that are defo brighter than the others - see if they are coming from the same coil and if they are - it just might be that my party
trick of swapping over the LT leads to the coil will sort it out.
Its a long shot, but it might just work - as Hannibal used to say.....
I haven't had all the leads with all the plugs connected earthed out simultaneously, but if I do, and experience symptoms as you describe, even
though I know the LT wires are connected correctly (i.e coloured wire to green terminal and black/white wire to black terminal on coils) I should
swap them around on that particular coil?
Andy.
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jambojeef
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| posted on 6/4/07 at 02:29 PM |
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Well if you are completely sure they are connected correctly then my party trick aint gonna work - to be honest though, I thought I had had connected
mine correctly and doing the swappy wires trick sorted mine out which had been doing similar things to yours.
Only other thing is - have you re-made plug leads or have you bought a new coil recently?
I hadnt made mine up quite right and so was getting a poor spark on a cylinder or two before I did it again.
Just a thought
Geoff
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andrew.carwithen
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| posted on 6/4/07 at 02:39 PM |
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Jambojeef,
Just been out and earthed all plugs simultaneously. Doesn't seem to be any significant difference in quality of spark between any of them. I
swapped over LT wires anyway, but wouldn't run at all so I deffo had them connected correctly.
I have extended all the HT leads bar one. I have checked the connections and all seem ok.
Perhaps it is just a case of duff plugs after all. Looks like I'm going to have to bite the bullet and get a new set (anybody recommend/know of
a cheap supplier for NGK irridium plugs? - looked on ebay and approx £32 for four inc. postage. Is that about as cheap as I'm gonna get them
for?)
If changing the plugs doesn't sort it, then it must be a carb problem.
Andy.
[Edited on 6/4/07 by andrew.carwithen]
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chockymonster
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| posted on 6/4/07 at 03:07 PM |
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Are those cylinders getting fuel?
Carbed or EFI engine?
PLEASE NOTE - Responses on Forum Threads may contain Sarcasm and may not be suitable for the hard of Thinking.
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andrew.carwithen
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| posted on 8/4/07 at 09:47 AM |
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Have changed plugs for new NGK iridiums and bought a new set of NGK plug caps (Thought the originals may have been breaking down under load) but was
still only running on two cylinders.
So had to be a carb problem.
Removed carbs and float bowls. Sure enough, pilot jets on offending cylinders are completely blocked. So it'll be off to see if Halfords etc.
open on Easter Sunday for carb cleaner.
Assuming that once the above problem is fixed and all cylinders perform correctly, What tool do others recommend/have used for balancing the carbs?
(Just seen an ad in local rag for a Gunson's carb balancer for a tenner. Think its designed for use with SU's but does anyone know if it
can be used on bike carbs? and how good is it?)
Andy.
[Edited on 8/4/07 by andrew.carwithen]
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