Question about Yamaha V-Max Motorcycles
You could test the coil with the help of a meter.If the coil tests good you then need to test the pick up coil coming from the stator cover, all those tests eventually lead back to the cdi box if they test good. You can test either the pick up or ignition coil first, I often just go right to the pick up on the Yamaha's.
Those things have an electronic CDI.
You could have coils that would Arc Weld,,,,
if CDI amp or triggers are not working it doesn't do any good to crank it and look for a spark,,huh?
Pull gas tank off so you can get to the coils.
Live Fire Test,,
gives visible confirmation of function
Unplug "hot" wire at coil
---Only 2 wires besides the spark plug cable,,one's Ground,,one's "hot"
Get a wire connected to any verified +12v source,,,
and poke it at Coil's Primary lead(the hot wire)
DO NOT leave it connected any time,,,just contact>release.
It wont spark till you "break" the circuit.
If the coil sparks a plug,,,it's OK
Odds are slim that a coil is bad.
Probably the "box",,Igniter/CDI Unit,,,whatever they call it.
You can use an ohmmeter to test the coil
--on Rx1 scale,,measure resistance between the 2 primary wires.
***You NEED factory specs to compare,,,but should be between 1 & 2 Ohms on most coils
--on Rx1000,,measure between Primary + and Plug wire.
***You NEED factory specs to compare,,,but should be between
7~8K and 20K??
Check the pickup coils with Ohmmeter---***You NEED factory specs to compare
Check their output on a millivolt scale---***You NEED factory specs to compare,,,but should fluctuate when cranked
Check primary voltage to Main Coil
Check 12V+ Supply to CDI box
Sometimes Ignition Switches are built with separate contacts for Ignition/Lighting/Cranking.
Yours,,I just dont know??
But the symptoms can be power to Crank,,but none to ignition.
Same for handlebar kill switch----in RUN position it's gotta MAKE contact.
Bad Contacts in there can leave Ignition circuit "off"--disconnected.
If 1 Coil Fires,,but other one doesn't,,,,swap the power wire at the coil.
--If the Dead Coil then Fires,,,both coils are probably OK
--if the previously firing coil quits when the primary wires are swapped......
Then that side of the CDI Box aren't working
Swap the wires back correctly so ya don't forget to later
Then go swap the connectors from the triggers-to-CDI Box
If it makes no difference to the Coil's Firing---
then BOTH the triggers/pickups are OK.
And one channel in the CDI Box is bad.
Because EITHER pickup works on "Good 1/2" of the Box,,
while NEITHER P/U works through "Bad 1/2" of the box.
If Swapping the Triggers at the CDI Box REVERSES which Coil fires & which don't....
Then the BOX is OK and one trigger/Pick Up coil is bad.
Because----Good P/U will fire through either channel on the box & makes it's corresponding Coil fire it's plugs.
But Bad P/U wont fire either side
If all 4 plugs are Dead,,Probably The Box.
VERIFY 12v supply voltage 1st before condemning it.
Odds are VERY slim Both Secondary Coils would fail at same time.
And just as slim that BOTH pickup coils would fail together .
If you use a Jumper Wire to test fire coils directly from Battery.
*Connect wire securely to Battery,,,and use a short,,expendable "contact" in the Coils Connector.
a)Ya DO NOT want to strike any arc at the BAT terminals
b) Your Test Make&Break Contact to trigger the Coil is a Hot Arc and will burn the Coil's Connector----so beat up on a nail or piece of scrap wire stuck in the connector instead of burning the connector itself.
---Do NOT apply any power to Pickup Coils,,,
--Do NOT apply any power to CDI Box's P/U Inputs
I'd start by verifying 12v+ to the CDI Box....if it's there,,you eliminate all the possibilities of wiring harness & switch problems.
Really a simple circuit.
It's like 2 separate Ignition Systems,,but with BOTH their CDI Amps in same box.
(TRIGGER #1 & #2) --->(CDI Box which has #1 & #2 Channel)-----> (Ignition Coils #1 & #2)
Only thing besides those 3 basic component groups is the 12V+ supply to the CDI Box---keep in mind it is Switched at several points ,,,as well as having plug-in connectors on the harness .
Those type things can stop it just as dead as a bad part.
A nice website to look at :-
Posted on Aug 04, 2010
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Posted on Jan 02, 2017
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