Sunday 19 April 2015

Cagiva Mito 125 Not starting not sparking no spark

Going to do a post on not sparking , as just come across this again


a bike and id forgot everything

so had to go through all the tests again .

Id just like to say i am not really that good with electrics but i know 

something test first , do not buy parts and read and learn as much as 

you can  .

see also our post on troubleshooting 

Cagiva Mito 125 not sparking no spark

First off check all easy stuff .

So -

Fuses , Check all of them , make sure they are seated corrected actually pull them out clean contacts and refit
spray contact cleaner in the terminals

Battery , make sure its fully charged remove from bike and recharge dont just guess ,
and whilst doing this clean up the battery terminals and the negative and positive wiring terminals .

If you have a voltage meter you can do some basic tests.
When the engine has been off for at least 1-2 hours with ignition key turned off,
100% Charged 12.60 to 12.8v
75% Charged 12.4v
50% Charged 12.1v
25% Charged 11.9v

0% Charged less than 11.8v

Connections and Connector blocks , go though all the connector blocks take them apart spray contact cleaner inside then then put them back together repeat this a few times on each connector as it will clean the contacting surfaces .  If there are any home made repairs or connections redo them , its sound like a lot of work but ive lost count of how many non running bikes ive bought and its been a faulty wiring connector .

Side Stand and or Kill switch , fully confirm that these are working properly with a multimeter do not assume they are ok , do not buy any parts until you have tested these , ill do these tests on a post one day but they are simple , see the video below and the recommended book as well .

Generator test , tbh im sure the bike would run with a faulty generator but probably not for long
so i test this now , its an easy test and at the very least confirms it working or not .
see our post on testing the generator and pick up coil here .

Pick up coil test similar to a crank shaft position sensor you can test the resistance with a multimeter and check it against the measurement in the CBR 125 workshop manual and you can check the signal by back probing the wire connector and using a oscilloscope see this test here .

HT coil , Next i would test the ht coil , first id test the primary side for 12v whilst turning the bike over , if you have got 12v at the white and blue wire then test the coil if you have not got 12v to primary side of coil , then
its likely to be ECU ( if its not wiring fault ) , if you have 12v to here great you just eliminated all the expensive stuff .

CDI , if all else has failed try a known good CDI , but prior to fitting make sure all is funcition
properly on the bike it might of burned the old CDI out for a reason , ill do a CDI test post one day
if i can figure it out  .

Rectifier regulator , You should have found the problem buy now ive never got this far , now
the rectifier only changes the output of generator to DC to recharge battery and run lighting system so this will have nothing to do with the ignition system , but some have told me they changed this and
they got a spark and seeing as all else has failed !!  .

Cagiva Mito 125 not sparking no spark

Cagiva Mito Electronic ignition system components for sale on Ebay

Here is an Excellent video on NO spark fault finding watch it all !!

On Amazon UK here is and excellent book on motorcycle

Cagiva Mito 125 not sparking no spark

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