1980 laverda jota correct battery amperage,and physical

S

steve.bennett

New member
Location
burbage village .leicestershire
According to the Green Book the original battery spec was Fiamm 61F5P .32 amp 12volt. i currently have fitted an Exide at 30 amps this struggles and will not turn over quick enough to excite the Bosch ignition. And the battery dimensions are slightly smaller to the carrier, obvious to me battery ageing but not really man enough in the first place. is there on the market a battery of the correct dimension's to fill the carrier have 32 amp or more cranking power especially when cold.
i have had the tank off plugs out of the head, and connected to there H.T. leads earthed and spun the motor on the starter good spark on all three plugs.is there a member out there can point me in the direction of the correct physical size battery of 32 amps or even more..i do prefer top wet cell,
thankyou .Mr,steve.Bennett ILOC member 4269J.
 
The 30 and 32 Ah are measures of the total storage capacity of the battery and not directly connected to the CCA (cold cranking amps) which does affect the ability to drive the starter.
How old is your Exide battery?
It may be worth checking that your connections: battery (both); starter relay (both); starter motor and earth are all clean and tight.
Are the starter cables flexible or stiff? They may benefit from replacement.
Have you checked the starter motor brushes?
These all contribute to starting problems.
 
A healthy triple with decent compression will start willingly with a battery as small as 14Ah, IF the starter and associated circuitry is in good condition. If it doesn't readily spin with 30Amps pushing it, lots of current is being wasted at some point.

My battery of choice is a 18-20Ah gel-type, as widely used in Beemers with their superfluous ABS systems. Works nicely, has ample reserve for cold starting and saves a good deal of weight and space.

piet
 
Your problem is elsewhere. Check, clean, all earths and if no improvement, it's starter motor out and opened.

Those big batteries where put on the first triples with a puny alternator output and no regulator so the battery soaked up the alternator output.
It's also a leftover from the 750 period when Laverda produced the world's first electric start motorcycle without a kick starter. They wanted to be sure of their act. And battery technology has evolved over the last half century.
There's even talk of battery powered vehicles.

Paul
 
Even if you think your earth connections look good, if you have the braided copper wire Earth strap, this can have enormous amounts of internal corrosion. In this application, size doesn't matter.
 
Your starter motor is taking to much current. Take it apart clean it up, refit and you'll find the bike will start straight away.
Alan.
 
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