Yamaha 650-701-760 Total Loss ignition

[Superjet1000]

Hey need some help Diagnosing fault.

Engine is missfiring under load almost like a rev limiter comming on way early.
LED flashes very fast when playing up.
Runs fine for a while then playes up very consistantly.
Thought it was water related so resealed the couple of wires that are resin core shrink wraped, electrical contact cleaned all deutch connectors plug leads ect and re installed with di electric grease.
Checked all earths both coils ect 0.2ohms
Checked wires to pickups both same no broken wires, checked for shorts to ground.
Checked air gap 0.075"
Checked battery voltage while running 12.5v
Isolated OEM kill switch
The coils are mounted at least 6" from ignition on same plate.

This is a fairly new system 10-20 rides
Anything else i should check to narrow it down.

[Superjet1000]

Awsome product support..........................

[msdpowersports1]

There are a few things you can check first make sure you’ve grounded the right side of the coils. On the MSD coil part number 42921 there are two mounting holes one of them has a brass insert the other is silver in color. The one that needs to be grounded to the engine is the silver side. The other thing is the battery even with it showing 12 volts its best to load test it to make sure it has the power needed to run the system. Please let me know what you find. Here is my email address just in case you need it. rcorral@msdpowersportws.com

Thank you
Ray C.
1-915-856-2727

[Superjet1000]

Yeah figured it out a while back, ended up being a dodgy wire where it is molded into the trigger pickup. Tested fine every time on the bank but popped the flywheel and wiggled the wires to find it.

Drilled a few holes in the trigger mounting plate and zip tied the wires to it, hopefully this will reduce the vibration and increase reliability.

[Superjet1000]

So no reply via e mail so i'll try here again

Ignition is playing up again
No spark on both cylinders
All above ok
Battery has been load tested also and swapped out just in case
1x New trigger/pickup installed

Started to break down while riding.
Next ride ran fine for 1/2 hour, parked on the bank went to go for another ride but no spark.
left it for 5 minutes, started and ran for a couple of seconds killed the engine with the stop switch and no spark for 2 days
Ran for five minutes on the hose, killed the engine and no spark again 1 day.
Had no spark or LED while testing with LED operate switch on.
Next day rechecking myself LED working again switch to operate and engine runs again.

Any thoughts before this gets sent arount the world for testing which = no riding.

Still under warranty.

[msdpowersports1]

Sounds like something in the unit is heating up and shutting down. If the unit is with in the one year warranty it can be sent in for testing and if unit is found faulty it will be replaced. If the unit is still under warranty email me so I can give you a RMA number.



Thank you
Ray