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Ignition Pick Ups

Posted: 31 Jul 2008 11:38
by eekzoids
Where to start..well I'm back in the west of Ireland - no Morini fraternity round here so thank God for the MRC website.

Ok well I'm thinking of getting some of the new ignition pick ups from NLM. Why? - bike has started to misfire at high revs, though is still as always been very easy to start. Last year I rode up from London (in the pissing rain) to NLM just for a looksee and to get him to fit a new timing belt (from George Lane). He (Alex) checked the ignition timing and told me rear cyl. spark was retarding on accelaration which is obviously wrong, said something in the ignition system is on the way out but you can't tell you just have use trial and error ie changing each bit of the system (pick up, coils and transducer) to find where the fault is. One presumes he knows what he's talking about.Thus I thought my recently developed high speed misfire may be a further degradation. So I considered trying the new pick ups, as even if they are not needed they claim to be improvement on the original. I can't afford all the new parts in one go so thought that might be a good place to start.
Any comments, suggestions or cautions, alternatives tips or anecdotes related to this would be greatly received.
Wishing all of you good health and happy riding........... :roll:

Posted: 01 Aug 2008 06:21
by hendre
Hi,

Maybe it is worth wile to switch transductor boxes (just change over the red wire from the pickup and spark plug caps) and check if the problem stays with the rear cilinder. If this is the case your pickup is indded shot, if the problem moves to the front cilinder your transductor is the one to blame for the troubles...

In all cases before you do anything check all electrical connections and earthing points on the frame, lots of ignition and electrical problems are caused by corroded contacts.

André

Posted: 01 Aug 2008 18:56
by 3narf
...And make sure you have EV plugs, not ES ones.

Posted: 01 Aug 2008 20:49
by EVguru
Why? They run just fine on BP7ES.

As I understand it, the NLM pickup assembly is currently suspended. The last batch of pickup coils had the wrong spec and they're trying to find an alternative to fit.

A missfire on one cylinder at high rpm sounds like a transducer going out.

Posted: 04 Aug 2008 13:38
by 3narf
EVguru wrote:Why? They run just fine on BP7ES.
Hmm. Just going by my own experience. I had a missfire at 7000 after fitting ESs which miraculously cleared when I put EVs back in.

Maybe I had a dodgy one or maybe the better quality EV plugs mask a slight transducer fault.

I don't just make this stuff up, you know.

:roll:

Posted: 04 Aug 2008 14:16
by EVguru
The wire centre electrode of an EV plug will fire at a lower voltage than the ordinary ES, but they're harder to find down the local motor factor and more expensive.

I'm sure we've had this discussion before, but I'd really rather not mask a problem, they have a habit of coming back to bite you.