Question about 1981 Laverda 1000 Jota

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1978 jota intermittant firing

I own a late 1978 jota

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With BTZ ignitioni am having increasing problems with it only running on oneor two cylinders until it warms up and all three kick in.Its usually the right side pot that has problems and sometimes the leftbut never the middle. With the plugs out ,the left side and centre plugs are a nice golden brown but the right plug is running rich(black/sooty),when i clean it and replace it the bike fires up like a good 'un..However ,when left overnight and started in the morning(especially if its cold)it usually only fires on the 2 left pots. Even though i'm having a few probs, this bike (when firing on all 3) is absolutely Awesome.I've never had a bike like it. , I would recomend to start at the carbs. If you have a friend with an ultrasonic cleaning-bath, buy yourself 3 gasket-kits for the carbs, totally unmount them (maybe one after the other to avoid you end up not knowing how to put them together again...), clean them, exchange all O-rings and gaskets, make sure all jets are free and - VERY important - check the float-hights and synchronize both the carbs and the choke-sliders. With little tuning on the mixture screw, it should be very reliable on starting after that.,,,

Posted on Nov 10, 2008

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Hi and welcome to FixYa,

To my understanding, an air leak would be anywhere before the carbs; the air box  cover, the the 4 coupling rubber tubes or even the air filter itself.  Although an air leak in any of these areas would not cause an intermittent high idle. Air leak here would cause a lean mix and/or a flat spot while accelerating.  

On the other hand, a vacuum leak could cause high idle. Vacuum leak would be after the carbs and on any of the coupling to the intake ports of the engine or how they are fitted. In some versions, there are balancer nipples that have interconnecting rubber hoses and/or a vacuum line to the fuel cut-off valve that couls also have a hole or tear. It must be noted that the high idle because of a vacuum leak is consistent.

Intermittent high idle would often be mechanical or almost always on the throttle system. Common causes are:
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1 Answer

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32 amp brand new its been on charge for about 18 hours Acid for battery was put in by a dealer all electric functions working except the starter when the starter button is pushed there is a click and I can feel movment in a solonoid in front and just above the battery (in an ally case) all nuts to starter motor removed cleaned and re tightened Fuses checked (I can only find 2) these fuses are located behind the left side of the battery in a little black cover are perhaps there more fuses which are relavent to the starter the bike is in my workshop and I cant really get a go at jumping it on my own. I did try jumping when I thought it was the battery but it wouldnt go. I thought it was due to NO charge in the battery. Try a single jump lead from the +'ve on the battery direct to the starter motor. A screwdriver across to 2 solonoid connections does the same thing but is harder to control. You need to be careful as if there is an internal short in the starter motor you can run the risk of serious burns from very large fault currents flowing. Next is the poxy short battery negative to crank case...replace with a longer one to the actual starter motor 8m/m mounting bolt ( closest 8m/m to the barrel is more neat ). Less hazerdous is to get a cheap mumtimeter and measure the voltage across the starter motor when you press the starter button some times it is just a dirty segment on the starter motor remove plugs from cylinders, load the HT leads with removed plugs, rest against engine and engage top gear. Press the starter and rotate back wheel slightly backwards ( rocking motion ) going backwards engages the jaming roller clutch to move the starter off the dirty segment if present,,,

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Nov 10, 2008 | 1982 Laverda 1000 Jota

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