.jpg "Yamaha YZF R125 will not start no spark diagnostics")
R125 will not start not sparking
R125 Ignition system wiring diagram ( Spark )
Going to do a post on not sparking , as just come across this again on
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 .
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
do not just guess , and whilst doing this clean up the battery terminal
and the negative and positive wiring terminals .
Test battery at the negative and positive 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
i have lost count of how many non running bikes i have bought
and its been a faulty wiring connector.
Side Stand and 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 I am 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 this here .
Pick up coil testing , this is what send a signal to the cdi to tell it when to generate spark signal , see out test for his 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 here 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 , test the HT coils
primary and secondary sides read this post here.
CDI , if all else has failed try a known good CDI , but prior to fitting
make sure all is function 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
I have 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 !! .
Oh someone pointed out i never mentioned the ignition switch , which is true , ive never come across this myself but it would be worth check continuity on the ignition switch .
Here is an Excellent video on NO spark fault finding watch it all !!
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