Engine problem
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Thread: Engine problem

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    Junior Member Rabb's Avatar
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    Engine problem

    Was having a run out up the Pennines yesterday when Nelli started to have engine 'dropouts', monitored it over the rest of my ride and figured it happens between 4 and 5000 revs only. Also only if I'm not really accelerating. If I accelerate reasonably hard it doesn't do it. It is as if the whole engine shuts down for a fraction of a second. If I hold revs around 4-5000 it runs, cuts out, runs, cuts out etc. etc. Apart from that no other symptoms except seems a little thirstier lately although been out on my own and ride a little harder. Any clues before I start messing around greatly appreciated. BTW she had full service, new cam chain, plugs, z25 washer, fuel pipe, oil etc at Bennetts 1 year/2500 miles ago. TIA.

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    JPF
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    Sounds like a coil stick has gone, or is in the process of going.
    Rev range is about right for the symptoms of failure.
    I take it that once above 5k the symtoms stop?
    If thats the case its deffo a coil stick starting to fail.
    JPF


    The pen is mightier than the sword....but the sword has its point!

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    Junior Member Rabb's Avatar
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    Thanks JPF ....... can I test these with a multimeter and if so can I find specs somewhere?

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    Senior Member Engenia's Avatar
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    Quote Originally Posted by Rabb View Post
    can I test these with a multimeter ?
    No. It'll be breaking down under high voltage, which a multimeter won't provide.
    As the problem progresses it'll begin to idle on two, and then you can easily work out which one it is. It's the one you can still touch without burning yourself.
    Or you could simply pick one before the problem progresses, swap that stick and try it. Chances are, if it were my luck, you'll get it right on the third try.
    yamahamad, ron d and Rabb like this.
    hooroo, Errol www.engenia.com.au [139,200 km - and counting .....]

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    JPF
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    Quote Originally Posted by Engenia View Post
    . Chances are, if it were my luck, you'll get it right on the third try.
    ron d likes this.
    JPF


    The pen is mightier than the sword....but the sword has its point!

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    Junior Member Rabb's Avatar
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    Thanks for info lads. Yes, symptoms stop above 5000 revs. I was thinking about this and would one faulty coil give the impression that the whole engine was intermittently cutting out as that's how it felt? Cheers.

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    JPF
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    Go for a quick spin with someone riding behind....he will smell unburnt fuel every time you have the issue,,,,then test downcommer pipe to find out which one is faulty
    JPF


    The pen is mightier than the sword....but the sword has its point!

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    Junior Member Rabb's Avatar
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    Thanks again but I can't get my head around the fact that the whole engine shuts down, doesn't feel like it drops one pot. And it only happens at 4 to 5000 revs so I doubt exhaust will get cold. Just tried it stationary in the garage, didn't do it. Still can't get used to how mechanically noisy these motors are, sounds like no oil in there. 😲
    Gonna take it out again tomorrow evening to just get another feel of the problem. Will post update.

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    Senior Member Engenia's Avatar
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    Quote Originally Posted by Rabb View Post
    Thanks again but I can't get my head around the fact that the whole engine shuts down, doesn't feel like it drops one pot. And it only happens at 4 to 5000 revs so I doubt exhaust will get cold. Just tried it stationary in the garage, didn't do it.
    If you lose one pot it'll be down on power, but the revs won't drop to zero.
    If the revs drop to zero, the tip over switch could be the culprit, but to get it going again you would have to cycle the ignition.
    So if it comes back by itself it's likely to be the crank sensor. These have been known to fail irregularly. It could even be a dodgy connection to it. There may be a harmonic between 4 & 5 thousand that disconnects it.

    First & easiest thing to try is the coil. No loss if it's not as they will eventually fail anyway, so a spare is handy. I have 3.
    Still can't get used to how mechanically noisy these motors are, sounds like no oil in there.
    If you compare the Tre engine to almost any other you'll see that there is absolutely no attempt at sound deadening, so that's one reason. The other may be the clutch. If the cush springs are loose they will rattle
    ron d likes this.
    hooroo, Errol www.engenia.com.au [139,200 km - and counting .....]

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    Junior Member Rabb's Avatar
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    Thanks Engenia,

    Gonna take Nelli out for a spin, hopefully tomorrow night, to just pin down the symptoms.
    I accept the coil thing ,worth a first try. Should I, and can I get original Benelli coil sticks or is there a substitute more readily available in the UK that does the job? ………

    Cheers

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